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Migration patterns for Medicaid enrollees 2005-2007.


Throughout the history of Medicaid, little has been known about cross-state enrollee migration. The state-based administration of Medicaid has raised concerns about enrollment gaps that may occur when enrollees move to another state. Some moves are driven by loss (or a gap) in Medicaid coverage, and some enrollees with gaps may obtain private coverage. However, Medicaid enrollment gaps are often associated with gaps in health insurance coverage (Czajka, 1999; Sommers, 2009), affecting continuity of care, increasing unmet need and elevating health status risks. Such gaps often lead to increased use of emergency room services and increased overall health care system costs.

National Medicaid statistics are typically aggregates of state statistics. Therefore, individuals enrolled in more than one state are double counted. An analysis of the underestimate of Medicaid enrollment in the Current Population Survey, as part of the Medicaid Undercount project (Call et al., 2001; Davern et al., 2009), highlighted the importance of un-duplicating enrollees who move across states, to count national Medicaid enrollment accurately and produce better estimates of the number of uninsured individuals. Better estimates of Medicaid enrollment lead to better estimates of the uninsured in support of policy options to meet their health care needs (Dubay, Holahan, & Cook, 2007).

This study provides a focus on Medicaid eligibility issues related to two primary questions:

To what extent do Medicaid enrollees move across states, causing national Medicaid enrollment estimates to be artificially high and uninsured estimates to be artificially low?

To what extent are Medicaid enrollee cross-state moves associated with gaps in enrollment?


This study used unduplicated Medicaid Analytic eXtract (MAX) enrollment data for 2005-2007, the most recent unduplicated data available at the time of this study. We sought to develop a methodology that would enable us to examine all cross-state migration that occurred during 2005-2007, even though Medicaid enrollee migration was affected by Hurricane Katrina during these years. (1) MAX data are annual state-specific data files in which Medicaid Statistical Information System (MSIS) enrollment records and claims are aggregated by calendar year, and interim MSIS transactions are adjusted to produce final-action records. States submit person-level data on Medicaid enrollment, services, and payments to the Centers for Medicare & Medicaid Services (CMS) through the MSIS (CMS, 2010). Because MSIS administrative data cannot easily be used for research, CMS developed MAX data, person-level enrollment and event-level services data for each Medicaid enrollee, including Medicaid expansion Children's Health Insurance Program (CHIP) enrollees.

MAX data are widely used for research and policy analysis, but their utility is limited for certain types of research, because eligibility records have not been linked for people who are enrolled in more than one state. To address this limitation, CMS contracted with Mathematica Policy Research to design and construct unduplicated research files that reconcile duplicate Medicaid enrollment records in MAX 2005, 2006, and 2007, creating an unduplicated research file that contains one record for each enrolled person in the United States. The un-duplication algorithm links a pair of records hierarchically if they agree on any one of the following:

* MSIS Identifier (within a state only)

* MAX Social Security Number (SSN) + sex + at least two parts of the Date of Birth (DOB) elements (DOB year, DOB month, DOB day)

* Medicare Enrollment Data Base (EDB) SSN + sex + at least two of (DOB year, DOB month, DOB day)

* EDB-Medicare Health Insurance Claim (HIC) number + sex + at least two of (DOB year, DOB month, DOB day)

A comprehensive analysis of the un-duplication process is available in the report "Continuing Development of the Medicaid Analytic Extract Enrollee Master (MAXEM) File" (Czajka, Wenzlow, & Sykes, 2010; Czajka & Verghese, 2011).

For each person enrolled in Medicaid at any time in 2005 through 2007, we created a record of their Medicaid eligibility for each of the 36 months. We defined an enrollment episode to consist of a number of consecutive months in which a person was enrolled in at least one state, preceded by and followed by months in which the person was not enrolled in any state. An enrollment episode includes enrollment in either one state or multiple states.

An examination of enrollment episodes identified a number of unexpected patterns. There were 306,456 enrollees with a date of enrollment in one state that was completely contained within a span of enrollment in another state. For these and most other instances of enrollment in more than one state at the same time, we identified a criterion that we called "resetting the clock." For example, if a person was enrolled in state A, and in a later month became enrolled in state B without termination in state A, we treated the person's record as though they were terminated in state A upon enrollment in State B. In addition, there were 364,540 enrollees who were enrolled in at least two states with the same starting month. Because it was not possible to determine if a move occurred or to identify the origin and destination state of a move, records for these enrollees were excluded from the analysis of moves.

This study presents a focus on cross-state moves, not moves within a state. If a person moved from one state to another, but did not become enrolled in the destination state, we had no record of the move. We determined that a move occurred if the person had enrollment in one state (origin state), followed by enrollment in another state (destination state). Similarly, if a person was enrolled in one state, then enrolled in different state, and finally enrolled in the original state, we determined that two moves had occurred. Gaps in enrollment were defined as months during which the person was not enrolled in Medicaid in any state. We examined the number of moves per enrollee, and the number of states to which an enrollee moved, to determine if a greater number of moves, or moves to more states, increased the length of enrollment gaps. An enrollee had an enrollment gap associated with a move if enrollment was not continuous across the states.

We performed analyses by major basis of eligibility (BOE) categories: aged, disabled, adults, foster care children, and other children (further categorized by age: over age 6, age 1-6, and under age 1). The in-migration rate for a state is the number of moves to the state during 2005-2007, based on the last recorded move to the state (one move per enrollee) divided by the number of state enrollees in 2005-2007, based on the last recorded state of residence.


Enrollees Who Moved

Of nearly 76 million Medicaid enrollees from 2005 to 2007, over 73 million (96.3 percent) did not move, leaving 2.8 million (3.7 percent) who moved at least once and obtained Medicaid coverage in more than one state (Exhibit 1). The highest percentage of enrollees who moved were other children age 1 to 6 (5.5 percent) and foster care children (5.3 percent). At just 2.0 percent, aged enrollees accounted for the lowest percentage of movers. Those who moved twice, and those who moved 3 or more times, represented 19.1 percent and 3.8 percent, respectively, of all movers (Exhibit 2). Among enrollees who moved twice, 80.2 percent moved to a new state and then back to the original state. For enrollees who moved 3 or more times, less than half (44.3 percent) enrolled in only 2 states, while the remainder had various movement patterns with enrollment in more than 2 states.

Number of Moves and Number of States

Nearly four percent of Medicaid enrollees moved at least once between states in 2005-2007. Among movers, most moved only once (2.9 percent), while some moved twice (0.7 percent) or 3 times or more (0.1 percent; Exhibit 2). Among movers, the vast majority (3.5 of 3.7 percent) moved between only 2 states, 1 or more times (Exhibit 2). Among all movers, 77.1 percent moved only once during the study period, varying by BOE group from 73.2 percent (other children age 1 to 6) to 87.7 percent (aged; Exhibit 3).

Moves Associated with Enrollment Gaps

For all enrollees, 72.2 percent of moves were not associated with an enrollment gap (Exhibit 4). The percent of moves associated with enrollment gaps of fewer than 3 months (8.2 percent) was fairly consistent as the number of moves increased, ranging from 7.9 to 8.8 percent. The share of all enrollees with gaps of more than 6 months was 11.4 percent, but it declined monotonically as the number of moves increased--14.4 percent for one move versus 1.2 percent for 5 or more moves.

Length of Enrollment Episodes

With the exception of disabled and foster care child enrollees, the average enrollment episode length declined only slightly as the number of moves increased (Exhibit 5).

Migration Patterns

In general, Medicaid migration patterns mirrored population migration patterns in that states with higher Medicaid in-migration rates had higher population in-migration rates (correlation coefficient = 0.55; Exhibit 6).For most states, Medicaid in-migration rates differed by fewer than 3 percentage points from population in-migration rates, but Medicaid in- migration rates were more than 4 percentage points higher than population in-migration rates for four states: Nevada, Wyoming, North Dakota, and South Dakota. Medicaid in-migration rates were lower than those in the general population for five states: Alaska, California, the District of Columbia, Hawaii, and Vermont (Exhibit 6).

Enrollee Moves for State Pairs

By a wide margin, the largest number of enrollees (68,964) moved from Louisiana to Texas, undoubtedly in response to Hurricane Katrina (Exhibit 7). This number was two- thirds higher than the number of enrollees who moved from California to Arizona, the pair of states with the next highest number of movers. The number of enrollees moving from Texas to Louisiana ranked sixth among state pairs. State pairs with the highest rankings were often neighboring states. For several pairs, the number of enrollees who moved was high in both directions. In other instances, a substantial number of enrollees moved in one direction but not in the other. For state pairs with more than 20,000 moves, the only state pair that had more than 40 percent of moves resulting in an enrollment gap was Texas to Louisiana (42.5 percent).


National Medicaid data count enrollees for each state in which they were enrolled, over-counting national enrollment. However, the magnitude of the over-count was relatively small, with only 3.7 percent enrolled in more than one state during the study period (Exhibit 1). Whenever possible, unduplicated enrollee data should be used for estimates of national enrollment and corresponding estimates of the uninsured population. (2)

For movers, 72.2 percent (Exhibit 3) did not have gaps. The percent of moves with gaps shorter than three months remained constant as the number of moves increased. In contrast, the percent of moves associated with gaps longer than 6 months decreased as the number of moves increased from 1 to 5 or more moves (14.4 percent and 1.2 percent, respectively) (Exhibit 3). Various factors may account for this decrease. (3) First, the socioeconomic characteristics of enrollees with more moves (e.g., lower income) may have differed from the characteristics of those with fewer moves, increasing the likelihood that the former would qualify for Medicaid in a new state. Second, enrollees who moved more times may have gained a better understanding of eligibility policies, allowing them to apply more easily for Medicaid in a new state. Third, for enrollees who moved back to a state in which they previously resided, re- enrollment may have been easier. We hope that future research will provide further insight into this finding.

Among all enrollees who moved, the average length of eligibility episodes remained relatively constant as the number of moves increased. This finding indicates that most moves are not associated with enrollment gaps and that enrollees do not appear to become "weary" of the Medicaid application process in new states as the number of moves increases. However, the observed decrease in the average length of an eligibility episode for disabled and foster care child enrollees, as the number of moves increased, is a concern.

Across the states, Medicaid in-migration rates ranged from 1.2 percent (California) to 11.9 percent (Nevada). Typically, Medicaid in-migration rates were higher than population in-migration rates.

Exhibit 7 shows the number of enrollees who moved and gaps in enrollment associated with a move for pairs of states with more than 20,000 Medicaid enrollees who moved. Most of these state pairs are neighboring states (e.g., California and Arizona, Florida and Georgia, New York and Pennsylvania) or both states have large Medicaid populations (e.g., New York and Florida, California and Texas). For the pair Louisiana to Texas, the number of moves was probably greater than it would have been during other times, because of Hurricane Katrina.


The findings presented above should be interpreted cautiously, because the analyses have several important limitations, as discussed below.

There is nothing to prevent individuals from simultaneously enrolling in Medicaid in more than one state, because states do not necessarily consult with one another before granting eligibility. When an enrollee moves, the original state may not know of the move and may not terminate eligibility. As noted above, 364,540 enrollees who were enrolled in at least two states simultaneously were excluded from the analysis of moves for methodological reasons. Had they been included, the overall migration rate for the study period would have increased from 3.7 percent to 4.2 percent.

In addition, the data may not show an enrollment gap when a person does not re- enroll in the destination state at the time of the move. The individual may not know that he or she is still enrolled in the original state and may behave as though he or she is no longer enrolled. We have no information about enrollees who moved, but did not re-enroll until after 2007. For these reasons, the observed migration patterns may not fully reflect the underlying migration patterns for the study years. Also, the percent of enrollees who moved and the percent of moves associated with enrollment gaps (especially longer gaps) could be understated, because the observation period ended in December 2007.

We have no data on the reasons for moves or enrollment gaps, which forces us to speculate about possible reasons for a move. We assume that most moves are driven by reasons other than the need to obtain Medicaid coverage, but it is possible that an enrollee lost Medicaid coverage in one state and moved to another state to obtain coverage. Future research that focuses on a comparison of benefit packages for state pairs with high numbers of moves may yield valuable insights into this possibility.

It is likely that the observed patterns of movement across states in this analysis are not representative of other time periods, because of Hurricane Katrina, particularly with respect to moves between Louisiana and neighboring states. It is also possible that enrollment gaps may be different (and possibly longer) for other time periods, because of the special attention that was expended to relocate individuals from the affected areas and provide needed services as a result of Hurricane Katrina. Still, it is important to understand migration patterns that result from disasters, such as Hurricane Katrina, because large numbers of in-migrants may place an unusually heavy burden on Medicaid eligibility operations and health care delivery systems.

Beyond Medicare coverage, the data provide only limited information on other health insurance coverage and changes in coverage over time. It is possible that some gaps in coverage may reflect enrollee success in obtaining private insurance coverage. Medicaid enrollee migration patterns for the study years may differ from the patterns observed for other years and may not apply to the Medicaid population after the Affordable Care Act (ACA) is implemented, because the composition of the enrollee population will change.


This study has highlighted two important issues. First, the study has shown that there is over-counting of Medicaid enrollment in national Medicaid statistics. Given that estimates of the uninsured are based, in part, on Medicaid enrollee counts, there is a corresponding undercount of the uninsured. Adjusting national Medicaid enrollment for the over-count will improve the accuracy of estimates of the uninsured population. This will aid policy-makers as they consider how to provide for the needs of the uninsured population during and after implementation of the provisions of the ACA. Second, some enrollee moves are associated with gaps in enrollment. This study has shown that the percentage of moves with short-term gaps is relatively low. However, such gaps my indicate a lack of health insurance coverage, resulting in a lack of continuity of care, risk to patient health outcomes, increased use of higher cost emergency services, and higher system-wide health care costs. With the increase of Medicaid enrollment expected as a result of ACA expansions, substantially increased program expenditures and increased emphasis on health homes and managed care, there should be further study on the reasons for short-term gaps in enrollment related to enrollee moves, and policy initiatives should be developed to eliminate these gaps to the extent possible.


David Baugh, M.A., Senior Researcher, Mathematica Policy Research, Inc., 1100 First Street NE, 12th Floor, Washington, D.C. 20002


We wish to thank John Czajka for his insight and advice on study methodology and interpretation of early findings, and for his, Allison Hedley Dodd's, and Julie Sykes' helpful comments on the manuscript. We also want to thank Cara Petroski, in the Office of Information Products and Data Analysis, Centers for Medicare & Medicaid Services, for her commitment to the development and continual improvement of MAX for Medicaid research and for her vision for conducting this study.


The authors have been requested to report any funding sources and other affiliations that may represent a conflict of interest. The authors reported that the development of this brief was funded by the Centers for Medicare & Medicaid Services (CMS) under contract number HHSM-500-2005-00025I, Task Order HHSM-500-T0002. This brief has been developed as a Medicaid Analytic eXtract (MAX) issue brief and it was posted to the MAX Web site in August 2012.


Call, K. T., Davidson, G., Sommers, A., Feldman, R., Farseth, P., & Rockwood, T. (2001, Winter). Uncovering the Missing Medicaid Cases and Assessing Their Bias for Estimates of the Uninsured. Inquiry, 38(4), 396-408. PubMed 38.4.396

Centers for Medicare & Medicaid Services (2010, August). Medicaid and CHIP Statistical Information System (MSIS) File Specifications and Data Dictionary, Release 3.1. Retrieved from andSystems/MSIS/downloads/msisdd2010.pdf

Czajka, J. (1999, May). Analysis of Children's Health Insurance Patterns: Findings from the SIPP. Mathematica Policy Research, 1999.

Czajka, J. & Verghese, S. (2011, May). Continued Development of the Medicaid Analytic Extract Enrollee Master (MAXEM) File. Retrieved from StatisticsData-and-Systems/Computer-Data-and- Systems/MedicaidDataSourcesGenInfo/Downloads/MAXEMFinalReport 2007.pdf

Czajka, J., Wenzlow, A., & Sykes, J. (2010, September). Development of the Medicaid Analytic Extract Enrollee Master (MAXEM) File, 2005 and 2006. Retrieved from andSystems/MedicaidDataSourcesGenInfo/MAXEM.html

Davern, M., Klerman, J., Baugh, D., Call, K., & Greenberg, G. (2009, June). An Examination of the Medicaid Undercount in the Current Population Survey: Results from Record Linkage. Health Services Research, 44(3), 965-987. PubMed

Dubay, L., Holahan, J., & Cook, A. (2007, January). The Uninsured and the Affordability of Health Insurance Coverage. Health Affairs 26(1), w22-w30. PubMed

Marreto, R. (2012, April). Local Government Estimates and Migration Processing Branch, Estimates and Projections Area, U.S. Census Bureau. Personal Communication.

Sommers, B. D. (2009, January). Loss of Health Insurance Among Non-elderly Adults in Medicaid. Journal of General Internal Medicine, 24(1), 1-7. PubMed

U.S. Census Bureau, U.S. Department of Commerce (2012, March). Geographic Mobility/Migration: State-to-State Migration Flows. Retrieved from

U.S. Census Bureau (2012, April). Population Estimates: National Intercensal Estimates 20002010. Retrieved from

David K. Baugh and Shinu Verghese

Mathematica Policy Research, Inc.

(1) Because the data did not include reasons for a move, we could not exclude moves associated with Hurricane Katrina.

(2) If this is not possible, adjustment factors (L4 percent for a single year or 3.7 percent for three years) would improve national Medicaid enrollment estimates based on administrative data.

(3) This finding could also be an artifact of state eligibility policies that do not necessarily terminate eligibility for people who move.
Exhibit 1. Number and Percent of Medicaid Enrollees Who Moved
and Did Not Move, by Eligibility Group, 2005-2007

                                             Number of    Percent of
                                             Enrollees    Enrollees
Medicaid Eligibility           Number of    Who Did Not   Who Did Not
Group                          Enrollees       Move          Move

Aged                            6,930,227    6,794,393       98.0
Disabled                       10,181,053    9,724,575       95.5
Adult                          22,306,979   21,654,909       97.1
Foster care children            1,160,948    1,099,513       94.7
  Other children               35,020,313   33,495,672       95.6
  Other children under age 1    3,531,965    3,443,899       97.5
  Other children age 1 to 6    12,795,395   12,093,524       94.5
  Other children over age 6    18,692,953   17,958,249       96.1
All enrollees (1,2)            75,960,337   73,129,879       96.3

                                           Percent of
                               Number of   Enrollees
Medicaid Eligibility           Enrollees    Who
Group                          Who Moved   Moved

Aged                             135,834    2.0
Disabled                         456,478    4.5
Adult                            652,070    2.9
Foster care children              61,435    5.3
  Other children               1,524,641    4.4
  Other children under age 1      88,066    2.5
  Other children age 1 to 6      701,871    5.5
  Other children over age 6      734,704    3.9
All enrollees (1,2)            2,830,458    3.7

SOURCE: Mathematical analysis of unduplicated MAX enrollment
records, 2005-2007.

(1) Includes 360,817 child enrollees of unknown age.

(2) Excludes 364,540 enrollees for whom it was not possible to
determine whether a move occurred nor the origin and destination
states of a move, and three enrollees with no BOE.

Exhibit 2. Number and Percentage of All Medicaid Enrollees by
Number of Moves1 and Number of States in Which They Were Enrolled,

                                             Number of States

                  Number,    Percent                            or
                    Any       Any      One     Two      Three   More
                   State     State    State   States   States   States

All Enrollees   75,960,337   100.0     96.3     3.5     0.2     0.0

No Moves (2)    73,129,879    96.3    100.0   NA       NA       NA

One Move (2)     2,182,791     2.9    NA      100.0    NA       NA

Two Moves (2)      539,678     0.7    NA       80.2    19.8     NA

Three or More      107,989     0.1    NA       44.3    44.5     11.2
 Moves (2)

One or More      2,830,458     3.7    NA       94.1     5.5     0.4
 Moves (2)
SOURCE: Mathematical analysis of unduplicated MAX enrollment records,

NA = not applicable.

(1) An enrollee can move back to a state in which he or she was
previously enrolled.

(2) Percentages by number of states (row percentages) add to 100

Exhibit 3. Number and Percent of Medicaid Enrollees Who Moved, by
BOE Group and the Number of Moves, 2005-2007

                                              Number of Moves

                               Number of

BOE Group                      Who Moved   One    Two    Three or

Aged                             135,834   87.7   10.8     1.5
Disabled                         456,478   77.1   18.6     4.3
Adult                            652,068   78.0   18.6     3.4
Foster care children              61,435   80.0   16.8     3.5
Other children                 1,524,641   75.7   20.3     4.1
  Other children under age 1      88,066   84.0   13.8     2.3
  Other children age 1 to 6      701,871   73.2   22.2     4.7
  Other children over age 6      734,704   77.1   19.2     3.7
All enrollees                  2,830,458   77.1   19.1     3.8

SOURCE: Mathematical analysis of unduplicated MAX enrollment records,

NOTE. An enrollee can move back to a state in which he or she was
previously enrolled.

Exhibit 4. Number of All Medicaid Enrollees, Number of Moves, and
Percent of Moves with Gaps in Enrollment, 2005-2007

                 Number of       Number of
                 Enrollees (1)   Moves       No Gap

All enrollees    75,960,337

No moves         73,129,879

One move          2,182,791      2,182,791   69.3

Two moves           539,678      1,079,356   75.3

Three or more
moves               107,979        360,445   81.2

One or more
moves             2,830,458      3,622,592   72.2

                         Percent of Moves with

                 Gap of less                   Gap of 6 or
                 than 3        Gap of 3 to 6   more
                 Months (2)    Months (3)      Months (3)

All enrollees

No moves

One move            7.9             8.5          14.4

Two moves           8.8             7.9           8.0

Three or more
moves               8.6             6.3           3.8

One or more
moves               8.2             8.1          11.4

SOURCE: Mathematical analysis of unduplicated MAX enrollment
records, 2005-2007.

(1) These numbers include 360,817 child enrollees of unknown age.

(2) A gap of fewer than three months may reflect the time required
by the new state to determine eligibility.

(3) A gap of more than three months may mean that the person was
not granted eligibility in the new state.

Exhibit 5. Average Multi-State Medicaid Eligibility Episode Length,
in Months, by BOE Group and Number of Moves, 2005-2007

                                       Number of Moves

BOE Group                   None   One    Two    Three   Four   Five +

Aged                        22.4   22.5   23.0   22.3    22.0   20.4
Disabled                    25.7   22.7   23.1   21.7    21.6   19.9
Adult                       13.0   12.5   12.7   12.6    12.6   11.9
Foster care children        23.8   20.8   18.7   17.3    15.6   17.3
Other children under         7.4   13.6   14.1   15.1    15.7   15.3
 age 12
Other children age 1 to 6   17.9   17.5   17.4   17.3    17.3   18.2
Other children over age 6   18.9   17.6   17.4   17.0    16.6   18.2

All enrollees (1)           17.7   17.4   17.3   17.1    17.0   17.6

SOURCE: Mathematical analysis of unduplicated MAX enrollment
records, 2005-2007.

(1) Includes 360,817 children of unknown age.

(2) These statistics for one or more moves are skewed, because of
conflicts in reported birth dates across states.

Exhibit 6. Comparison of Medicaid to U.S. Population In-Migration
Rates by State, 2005-2007


                                 Number of
                   Total          Enrollees
                 Unduplicated    Who Moved
                  Number of        into the    In-Migration
State            Enrollees (1)   State (1,2)   Rate (%) (3)

Alabama           1,142,114       46,016            4.0
Alaska              164,407        9,004            5.5
Arizona           1,948,818       98,500            5.1
Arkansas            896,002       52,362            5.8
California       14,541,148      176,756            1.2
Colorado            733,900       41,851            5.7
Connecticut         655,239       26,373            4.0
Delaware            228,173       13,731            6.0
District of
Columbia            190,362        9,810            5.2
Florida           3,824,219      182,154            4.8
Georgia           2,292,036      140,466            6.1
Hawaii              284,996        8,299            2.9
Idaho               284,358       22,105            7.8
Illinois          2,994,028       98,575            3.3
Indiana           1,305,847       73,311            5.6
Iowa                591,102       37,427            6.3
Kansas              456,212       32,740            7.2
Kentucky          1,064,129       53,874            5.1
Louisiana         1,330,061       66,886            5.0
Maine               414,079       14,039            3.4
Maryland          1,050,884       40,130            3.8
Massachusetts     1,553,054       37,072            2.4
Michigan          2,372,375       65,334            2.8
Minnesota         1,022,459       47,578            4.7
Mississippi         928,157       38,760            4.2
Missouri          1,416,442       68,193            4.8
Montana             145,161       11,422            7.9
Nebraska            326,742       22,266            6.8
Nevada              359,504       42,912           11.9
New Hampshire       178,598       11,542            6.5
New Jersey        1,334,686       48,009            3.6
New Mexico          639,980       35,013            5.5
New York          6,208,059      103,493            1.7
North Carolina    2,106,808      119,202            5.7
North Dakota        95,760         8,006            8.4
Ohio              2,624,193       91,980            3.5
Oklahoma            944,323       57,821            6.1
Oregon              688,411       46,635            6.8
Pennsylvania      2,553,561       92,758            3.6
Rhode Island        257,993       10,078            3.9
South Carolina    1,182,693       46,768            4.0
South Dakota        157,109       12,196            7.8
Tennessee         1,809,765       81,557            4.5
Texas             5,566,667      228,787            4.1
Utah                430,411       27,748            6.4
Vermont             197,077        7,356            3.7
Virginia          1,118,501       59,999            5.4
Washington        1,506,780       76,964            5.1
West Virginia       474,798       27,669            5.8
Wisconsin         1,267,704       48,972            3.9
Wyoming             100,455        9,959            9.9

                                 U.S. Population
                                 Number of
                                 Persons Who
                 Population      Moved into
                 as of July 1,   the State,        In-Migration
State            2006 (4)        2005-20075        Rate (%) (6)

Alabama           4,628,981        133,990            2.9
Alaska              675,302         37,218            5.5
Arizona           6,029,141        283,972            4.7
Arkansas          2,821,761        102,126            3.6
California       36,021,202        506,723            1.4
Colorado          4,720,423        192,717            4.1
Connecticut       3,517,460         87,516            2.5
Delaware            859,268         37,488            4.4
District of
Columbia            570,681         51,421            9.0
Florida          18,166,990        602,203            3.3
Georgia           9,155,813        356,471            3.9
Hawaii            1,309,731         59,810            4.6
Idaho             1,468,669         73,781            5.0
Illinois         12,643,955        235,118            1.9
Indiana           6,332,669        152,483            2.4
Iowa              2,982,644         86,447            2.9
Kansas            2,762,931         93,517            3.4
Kentucky          4,219,239        121,122            2.9
Louisiana         4,302,665        108,050            2.5
Maine             1,323,619         38,154            2.9
Maryland          5,627,367        170,792            3.0
Massachusetts     6,410,084        140,092            2.2
Michigan         10,036,081        135,513            1.4
Minnesota         5,163,555        107,945            2.1
Mississippi       2,904,978         85,141            2.9
Missouri          5,842,704        163,274            2.8
Montana             952,692         38,359            4.0
Nebraska          1,772,693         51,384            2.9
Nevada            2,522,658        137,389            5.4
New Hampshire     1,308,389         49,623            3.8
New Jersey        8,661,679        162,517            1.9
New Mexico        1,962,137         74,790            3.8
New York         19,104,631        280,448            1.5
North Carolina    8,917,270        331,211            3.7
North Dakota        649,422         24,395            3.8
Ohio             11,481,213        195,287            1.7
Oklahoma          3,594,090        119,160            3.3
Oregon            3,670,883        143,664            3.9
Pennsylvania     12,510,809        263,878            2.1
Rhode Island      1,063,096         33,062            3.1
South Carolina    4,357,847        168,441            3.9
South Dakota        783,033         28,505            3.6
Tennessee         6,088,766        192,095            3.2
Texas            23,359,580        581,983            2.5
Utah              2,525,507        100,987            4.0
Vermont             622,892         24,961            4.0
Virginia          7,673,725        283,355            3.7
Washington        6,370,753        221,910            3.5
West Virginia     1,827,912         53,313            2.9
Wisconsin         5,577,655        106,028            1.9
Wyoming             522,667         28,025            5.4

SOURCE: Mathematical analysis of unduplicated MAX enrollment records,
2005-2007 and U. S. Census Bureau.

(1) Counts are based on the last recorded state of residence and the
last recorded move for each enrollee during the study period, so that
each enrollee is counted only once.

(2) Excluding 364,540 people who were enrolled in more than one
state with the same starting month for at least two state-specific
enrollment episodes.

(3) The in-migration rate is the # of moves to a state (last
recorded move) divided by the # of state enrollees (last recorded
state of residence).

(4) Reference: U. S. Census Bureau, 2012.

(5) Reference: U.S. Census Bureau, U.S. Department of Commerce, 2012.

(6) We consulted with staff at the Census Bureau to identify the best
sources of numerator and denominator estimates (Marreto, 2012).

Exhibit 7. Number of Enrollees Who Moved and Gaps in Enrollment
After the Move, by Pairs of States with More Than 20,000 Medicaid
Enrollees Who Moved, 2005-2007

                                          Percent of Moves with an
                                              Enrollment Gap

                            Number of
                            Enrollees   Gap of   Gap of   Gap of More
Origin       Destination    Who         Fewer    3 to 6   Than 6
State        State          Moved       Months   Months   Months (2)
                                         (1)      (2)

Louisiana    Texas          68,964        2.7      3.5      3.9

California   Arizona        41,370        8.1      8.8     13.8

New York     Florida        37,261        7.6      8.3     13.2

Florida      Georgia        34,674        7.2      8.0     11.4

California   Texas          32,883        9.1     10.3     14.4

Texas        Louisiana      30,350        8.6     13.3     20.6

New York     Pennsylvania   27,838        6.8      7.7     12.7

California   Nevada         26,845        9.9     10.3     14.2

Arizona      California     25,957        9.6      9.1     11.5

California   Washington     24,904        8.0      7.1      9.8

Florida      New York       24,720        8.9      9.8     15.0

Georgia      Florida        22,840       10.6     10.8     14.5

Illinois     Indiana        22,473        4.4      4.3      6.3

SOURCE: Mathematical analysis of unduplicated MAX enrollment records,

(1) A gap in enrollment of fewer than three months may reflect the
time required by the new state to determine eligibility.

(2) A gap of more than three months may mean that the person was
not granted eligibility in the new state.
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Author:Baugh, David K.; Verghese, Shinu
Publication:Medicare & Medicaid Research Review
Article Type:Report
Geographic Code:1USA
Date:Oct 1, 2013
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