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Utilization and expenditures on chiropractic care in the United States from 1997 to 2006.

Over the last two decades, public utilization of complementary and alternative medicine (CAM) has grown substantially in the United States (Kessler et al. 2001; Barnes, Bloom, and Nahin 2008). The chiropractic profession was the first CAM profession to become established in the United States, and it remains the largest constituent of the CAM workforce with over 53,000 practicing chiropractors (U.S. Bureau of Labor Statistics, 2007) having over 85,000 U.S. licenses (Federation of Chiropractic Licensing Boards, 2007) (some chiropractors have multiple licenses). Chiropractors are now regulated in all 50 states, reimbursed by government and private health care insurance, and integrated into the military health care system (Meeker and Haldeman 2002).

Cross-sectional studies in the early 1990s showed substantive growth in utilization of CAM services by the American public (Eisenberg et al. 1993, 1998). Approximately 7.5 percent of U.S. adults are estimated to visit a chiropractor each year (Barnes et al. 2004), and 3.3 percent of the national office-based health care expenditures are devoted to chiropractic services (Davis et al. 2009). Although interest and utilization of CAM therapies appear to be growing, our previous work showed a decrease in new graduates from chiropractic colleges of 28 percent between academic years 2001 and 2003 (from approximately 3,500 to 2,500 graduates per annum) (Davis et al. 2009). However, from 1996 to 2005, national inflation-adjusted office-based expenditures on chiropractic care more than doubled, reaching a high of U.S.$7.3 billion in 2005. Whether U.S. chiropractors have attracted more patients to their practices or changed their clinical practices as an explanation for this increase in expenditures has not been explored.

Therefore, we sought to more fully investigate utilization and national expenditures on chiropractic care from 1997 to 2006. From nationally representative datasets on health services utilization, we extracted data on chiropractic patient demographics, national expenditures and charges, and estimates of the total number of U.S. adults who saw a chiropractor over the 10-year time period.


To obtain data on utilization and expenditures on U.S. chiropractic care, we analyzed data from the Medical Expenditure Panel Survey (MEPS) from 1997 to 2006 (The Medical Expenditure Panel Survey, Agency for Health Care Policy and Research 2009). Annually conducted by the Agency for Health Care Policy and Research, the MEPS is a nationally representative survey of the noninstitutionalized U.S. population. Information is gathered on health care utilization, expenditures, health status, and visits to health care providers. The MEPS utilizes an overlapping panel design consisting of a household component, medical provider component, and insurance provider component. Each respondent is interviewed five times over a 2 1/2-year time period, and a sample of medical providers and health care insurance providers are contacted to acquire additional information. For each year, personal and family-level data obtained from the household, medical provider, and insurance provider are aggregated and converted to annual estimates by MEPS statisticians. National estimates are calculated by the application of sample weights to reflect the participant's probability of selection and to account for sampling methodology.


We analyzed data from all respondents to the MEPS survey from 1997 to 2006. The MEPS utilizes a sample frame of the previous year's National Health Interview Survey to ensure a national representative sample frame. Sample sizes for the MEPS from 1997 to 2006 range from a low of 22,953 individuals in 1998 to a high of 32,737 in 2003; response rates ranged from 58.3 percent in 2006 to 66.8 percent in 1997. Respondents to the MEPS survey were asked if they had seen a chiropractor in the past 6 months and, if so, how many visits were made to the chiropractor and how much was spent on chiropractic care. If the individual reported having seen a chiropractor, the MEPS would then proceed to contact the individuals' chiropractor and health care insurance provider to verify information regarding utilization (i.e., visit dates and details of office-based or outpatient visits), charges, and expenditures. We restricted our analyses to U.S. adults ( [greater than or equal to] 18 years) because the vast majority of chiropractic patients in the United States are adults (Cherkin et al. 2002; National Board of Chiropractic Examiners 2005). The number of MEPS adult respondents who reported having seen a chiropractor ranged from 789 in 1997 to 1,082 in 2006.

Demographic Data

We examined demographic data for individuals who had reported having visited a U.S. chiropractor in 1997 and 2006, including age, gender, race, health care insurance type, income, and education. We aggregated respondent self-reported race from the six categories reported by MEPS into "white," "black," and "other/multiple." Health care insurance variables were combined for each corresponding year into "any private," "public," and "uninsured" categories. Census regions consisted of "northeast," "midwest," "south," and "west." The U.S. Census Bureau differentiates U.S. regions by population density. Areas that are considered "metropolitan and micropolitan statistical areas" (MSAs) are defined by a core population of 50,000 or more (metropolitan) or a micropolitan population of 10,000 or more (U.S. Census Bureau 2009). We report the proportion of chiropractic patients residing in MSAs.

Expenditures, Charges, and Visits to U.S. Chiropractors

We used the MEPS consolidated data files from years 1997-2006 to acquire information on the number of visits, expenditures, and charges annually and per visit to U.S. chiropractors. Charges were defined as the total amount billed for a health care service, while expenditures were the amounts actually paid by either the patient or their health care insurer. The MEPS distinguishes ambulatory visits to medical providers as either office-based or outpatient. Outpatient is defined as an ambulatory visit to a hospital and office-based are visits to health care provider offices. To estimate the total number of ambulatory visits to chiropractors, charges, and expenditures, we combined office-based and outpatient statistics. In addition, we extracted charges and expenditures on U.S. medical physician office-based encounters per patient and per visit over the same time period for comparison purposes.


We conducted descriptive analyses of the datasets using complex survey analysis methods. All analyses were conducted using STATA version 10.0 statistical software (College Station, TX). To create real estimates of professional health care charges and expenditures, we converted all data to 2006 dollars using the Consumer Price Index for professional medical services provided by the U.S. Bureau of Labor Statistics (2008). We used the annual average Consumer Price Index for all urban workers to convert the 1997 income of chiropractic patients to 2006 dollars.

In order to determine the relative amount spent on chiropractic care among individuals who use the service, we calculated the fraction of total office-based expenditures on chiropractic care. The fraction of total office-based expenditures on chiropractic care excluded the small portion of chiropractic services rendered in outpatient hospital settings.

We also calculated the fraction of total health care expenditures (inpatient, outpatient, office-based, and medical prescription expenditures) on ambulatory chiropractic services (both office-based and outpatient expenditures combined) among those respondents who reported using chiropractic care.


U.S. Adults Who Consulted a U.S. Chiropractor

The national projected total number of individuals who visited a chiropractor increased 68 percent from 1997 to 2006; from 7.5 million (95 percent Ch 6.6-8.3) in 1997 to 12.6 million (95 percent CI: 11.5-13.8) in 2006 (Table 1). The majority of growth occurred between 2000 and 2003 and was followed by relative stability in the chiropractic care-seeking population between 2003 and 2006 (Figure 1).

The total number of ambulatory visits to U.S. chiropractors grew by 70 percent from 64 million (95 percent Ch 53-74) in 1997 to 109 million (95 percent CI: 93-125) in 2006 (Figure 1).

The Characteristics of U.S. Adults Who Received Chiropractic Care

The characteristics of U.S. adults ([greater than or equal to] 18 years) who visited a chiropractor in 1997 and 2006 (Table 1) were largely similar. For both years, approximately 60 percent of chiropractic patients were female, the mean age was 47-48 years of age, and over 90 percent were white. Eighty-two to 84 percent of chiropractic patients had private health care insurance, 8 percent public, and 7-9 percent were uninsured. U.S. adults who visited a chiropractor in 2006 were more educated (43 percent had attended college or higher compared with 31 percent in 1997).

In both years (1997 and 2006) 19 percent of the total MEPS-projected chiropractic population was from the Northeast, 23 percent from the Midwest, 36 percent from the South, and 23 percent from the West. Chiropractic patients were not distributed equally across geographic regions; they were relatively overrepresented in the Midwest (36 percent resided in the Midwest compared to 23 percent of the entire adult MEPS population) and relatively underrepresented in the South (20-23 percent resided in the South compared to 36 percent of the entire adult MEPS population). Chiropractic patients were underrepresented in metropolitan/micropolitan areas (72 percent resided in MSAs compared with 82 percent of the entire adult MEPS population).

U.S. Charges and Expenditures on Chiropractic Care

From 1997 to 2006, the estimated total inflation-adjusted expenditures on U.S. adult ([greater than or equal to] 18 years) chiropractic care increased from U.S.$3.8 billion (95 percent CI: 2.9-4.7) to U.S.$5.91 billion (95 percent CI: 5.0-6.8): a net increase of 55 percent (Figure 1). A high of U.S.$7.4 billion (95 percent CI: 6.2-8.7) was spent in 2005 and a decline of 21 percent occurred from 2005 to 2006.


Among chiropractic patients, the mean per patient total annual inflation-adjusted expenditures on chiropractic care and mean inflation-adjusted expenditure per chiropractic office visit remained relatively unchanged: mean total annual expenditure per chiropractic patient was U.S.$508 in 1997 compared with U.S.$467 in 2006 and mean expenditure per chiropractic office visit was U.S.$62 in 1997 compared with U.S.$57 in 2006 (Table 2). The annual mean number of visits among chiropractic patients was stable: 8.5 visits per year to U.S. chiropractors from 1997 to 2006.

Among MEPS respondents who reported having seen a medical doctor, the annual inflation-adjusted mean expenditure on office-based medical physician services increased from U.S.$683 in 1997 to U.S.$1,018 in 2006, and mean expenditure per visit increased from U.S.$132 to U.S.$177.

Expenditures more closely mirrored charges for chiropractic visits (expenditure:charge ratio of 80 percent) than for office-based physician services (ratio 48-64 percent).


Chiropractic Expenditures as a Fraction of Total Office-Based and Total Health Care Expenditures

From 1997 to 2006 among chiropractic patients the fraction of total office-based expenditures spent on chiropractic care fell from a high of 33 percent in 1998 to 23 percent in 2006 (Figure 2). As a fraction of total health care expenditures among chiropractic patients, the percent decreased from 11 percent in 1997 to 8 percent in 2006.


Main Findings

Although the chiropractic workforce has remained stable from 1996 to 2005 and a decline in new chiropractic school graduates is evident, national expenditures on chiropractic care have grown (Davis et al. 2009). From 1997 to 2006, the inflation-adjusted national expenditures for chiropractic care increased 56 percent from U.S.$3.8 billion (95 percent CI: 2.9-4.7) to U.S.$5.91 billion (95 percent CI: 5.0-6.8). Between 2000 and 2003, the estimated total number of U.S. adults ([greater than or equal to] 18 years) who saw a chiropractor also increased 57 percent from 7.7 million (95 percent CI: 6.7-8.6) in 2000 to 12.1 million (95 percent CI: 11.1-13.1) in 2003 and has remained stable from 2003 to 2006.

Among chiropractic patients, inflation-adjusted total mean expenditure per U.S. adult ([greater than or equal to] 18 years) on chiropractic care and inflation-adjusted mean expenditure per chiropractic office visit have remained relatively unchanged from 1997 to 2006; at the same time, both expenditures per patient and per office visit to medical physicians increased by over 30 percent. U.S. chiropractors continue to use spinal manipulative therapy as their main treatment modality, which is a nontechnologically based therapy that is potentially less influenced by increasing costs of health care delivery (Meeker and Haldeman 2002). This may explain the stability of national charges and expenditures per U.S. adult chiropractic patient.

Our data suggest that the large increase in U.S. expenditures on chiropractic care in the United States was due to an increase in the total number of U.S. adults ([greater than or equal to] 18 years) utilizing chiropractic care. In 2006, 12.6 million (95 percent CI: 11.6-13.7) U.S. adults out of a total of 226 million adults in the United States (5.6 percent; U.S. Census Bureau 2007) visited a chiropractor. This percentage is lower than previous reports that estimated approximately 7.5 percent (Barnes et al. 2004).

Study Limitations

The interpretation of the findings is subject to several limitations. Our study only investigated treatment patterns, expenditures, and utilization among noninstitutionalized U.S. adult ([greater than or equal to] 18 years) citizens. Trends may vary among U.S. children (0 to < 18) and institutionalized U.S. citizens such as those individuals in nursing homes or in the military. Second, our findings were restricted to the time period between 1997 and 2006, and since this time changes in treatment patterns and national expenditure may have taken place. In addition, the MEPS interviews individuals regarding health care utilization and expenditures and therefore self-reporting errors may exist within the MEPS data; however, the MEPS does attempt to correct self-reported errors by verifying response data with the respondent's health care providers and health care insurance providers.

Though from 1996 to 2006 the MEPS has collected data on the utilization and expenditures spent on chiropractic care, variation in the way these data were collected from respondents may have impacted our results. Starting in 2002, the MEPS made a more concerted effort to delineate CAM providers by adding a probe to ensure that other CAM providers (acupuncturists and massage therapists) were reported the same as any other medical provider; before 2002 the only CAM profession recognized was chiropractic. It is possible that the expansion to include new categories of CAM providers may have affected the data on chiropractic care.


It is apparent that the chiropractic profession experienced significant growth in national utilization and expenditures between 1997 and 2006--and in particular between 2000 and 2003. The growth in the total number of U.S. adult chiropractic patients that occurred between 2000 and 2003 may imply that the chiropractic care became more rapidly adopted in the United States during this period of time. At the turn of the 21 st century CAM had gained significant attention in the United States (Eisenberg et al. 1998; Barnes et al. 2004), which may have increased utilization rates. Our data cannot explain the ramifications of higher U.S. adult utilization of chiropractic care, but the increase in the number of individuals using these services may either be contributing to higher health care expenditures overall or, by potentially replacing higher cost services, reducing national health care expenditures.

Interestingly, another study that used the MEPS to investigate the number of U.S. adults with spinal conditions found an increase of 21 percent from 1997 to 2005 (Martin et al. 2008). Whether the chiropractic profession has increased its market share among U.S. adults with spinal conditions or the increase in utilization is a result of increased prevalence of spinal conditions cannot be differentiated at this time.

The chiropractic profession competes for market share within both the CAM and mainstream conservative musculoskeletal markets (such as physical therapy). The increase in chiropractic patients could imply that the profession's market share in the United States has expanded. Nevertheless, lower barriers to entry among other CAM professionals such as massage therapists and acupuncturists who also treat low back and neck pain may result in a greater supply of CAM professionals and increase competition for patients within the CAM market. Additionally, physical therapists who are also trained in spinal manipulation (the main treatment modality among U.S. chiropractors) may exert increased competition in the future (Flynn, Wainner, and Fritz 2006).

Our work was unable to answer a fundamental question: Is growth in chiropractic care good for the nation's health or bad for it? If chiropractic delivers the same outcomes at a lower cost per case, then perhaps further growth is warranted; on the other hand, if chiropractic care does the opposite, it is possible that this growth is having a net negative impact on population health. Future work will investigate this question and will further investigate longitudinal trends in the market share of national health care expenditures on chiropractic care as well as other CAM services over this time period and in future years. In addition, we will attempt to determine whether U.S. chiropractors' market share of patients with spinal conditions has changed and how increases in the utilization of chiropractic care may have affected national health care expenditures and outcomes.


The chiropractic profession experienced significant growth in national utilization and expenditures over the decade from 1997 to 2006. The increase in national expenditures on chiropractic care was due to a 57 percent increase in the total number of chiropractic patients that occurred from 2000 to 2003. However, the total number of U.S. adults who saw chiropractors from 2003 to 2006 remained relatively stable.


Joint Acknowledgment/Disclosure Statement. The authors acknowledge and thank Ian Coulter, Ph.D., at RAND, Santa Monica, CA, for critical revisions of the manuscript.

Disclosures. This research project was unfunded and part of the lead author's graduate work at The Dartmouth Institute for Health Policy and Clinical Practice in Lebanon, NH. There exist no known conflicts of interest.

Disclaimers. The views expressed herein do not necessarily represent the views of the Department of Veteran Affairs or the U.S. government.


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Additional supporting information may be found in the online version of this article:

Appendix SA1: Author Matrix.

Please note: Wiley-Blackwell is not responsible for the content or functionality of any supporting materials supplied by the authors. Any queries (other than missing material) should be directed to the corresponding author for the article.

DOI: 10.1111/j.1475-6773.2009.01067.x

[Corrections added after online publication 12/4/09: on page 1, the percentages under both "Principal Findings" and "Conclusion" were wrong and have been corrected; on page 5, the percentage under "U.S. Adults Who Consulted a U.S. Chiropractor" was wrong and has been corrected; on page 6, the percentage in the first paragraph was wrong and has been corrected from "42 percent" to "70 percent"; on page 7, the net increase percentage under "U.S. Charges and Expenditures on Chiropractic Care" was wrong and has been corrected; on page 9, two percentages were listed incorrectly (36 percent in line 5, 37 percent in line 8) and have been updated to 56 percent and 57 percent, respectively; on page 12, the percentage under "Conclusion" was wrong and has been corrected. The authors apologize for these errors.]

Address correspondence to Matthew A. Davis, D.C., chiropractor, Grace Cottage Hospital, PO Box 216, 185 Grafton Road, Townshend, VT 05353; e-mail: Matthew A. Davis, D.C., Brenda E. Sirovich, M.D., M.S., and William B. Weeks, M.D., M.B.A., are with The Dartmouth Institute for Health Policy and Clinical Practice, Lebanon, NH. Brenda E. Sirovich, M.D., M.S., is also with the Veterans Affairs Outcomes Group, Veterans Affairs Medical Center, White River Junction, VT.
Table 1: Characteristics of U.S. Adults ([greater than or equal
to] 18 Years) Who Visited a Chiropractor in 1997 and 2006

 Mean, Total, or % (95% CI)

 p-Value for
 between 1997
Characteristic 1997 2006 and 2006 *

No. of chiropractic patients 789 1,082
 sampled (respondents)
Estimated no. of U.S. adult 7.5 12.6
 chiropractic patients (6.6-8.3) (11.5-13.8)
Age (mean) 46.9 48.0 0.25
Women (%) 56.8 59.5 0.26
 Race ((%)
 White 94.5 92.3 0.13
 Black 3.6 3.7
 Other/multiple 1.9 4.0
Insurance (%)
 Any private 82.0 83.9 0.29
 Public 8.4 9.0
 Uninsured 9.6 7.2
Income (mean 2006 dollar) 37,555 39,536 0.28
Education (%)
 High school or less 69.4 57.1 <0.001
 College or more 30.6 42.9
U.S. region (%)
 Northeast 16.3 17.4 0.77
 Midwest 36.0 3.5.6
 South 20.0 22.3
 West 27.8 24.6
MSA ((%) 71.8 75.0 0.41

* t-test used in mean comparisons and [chi square] statistic used in
comparison of proportions. CI, confidence interval; MSA, metropolitan
or micropolitan statistical area.

Table 2: Inflation-Adjusted (2006 dollar) Charges and
Expenditures on Chiropractic Care among Chiropractic Adult
([greater than or equal to] 18 Years) Patients and Office-Based
Physician Service Charges and Expenditures among Adults Who
Visited a Medical Physician in 1997 and 2006

 Mean or Total (95% CI)


 Chiropractic Medical
 Care * Physician Care ([dagger])

Total U.S.
 Charges 4.76 (3.45-5.7) 141 (131-151)
 Expenditures 3.81 (2.93-4.69) 90.6 (83.9-97.3)
Annual per patient
 Charges 636.1 (476.4-795.9) 1,064.7 (1,001.3-1,128.1)
 Expenditures 508.7 (406.5-611.0) 683.3 (642.6-724.1)
Per office visit
 Charges 72.8 (64.5-81.0) 196.9 (188.4-205.3)
 Expenditures 62.0 (56.0-68.0) 132.2 (125.9-138.4)

 Mean or Total (95% CI)


 Chiropractic Medical
 Care * Physician Care ([dagger])

Total U.S.
 Charges 7.32 (6.19-8.45) 316 (289-343)
 Expenditures 5.91 (5.02-6.80) 154 (141-167)
Annual per patient
 Charges 578.5 (509.8-647.3) 2,090.6 (1,979.1-2,202.1)
 Expenditures 467.4 (417.8-517.0) 1,018.4 (971.0-1,065.8)
Per office visit
 Charges 68.0 (61.7-74.3) 337.3 (321.2-353..5)
 Expenditures 57.3 (52.2-62.4) 176.7 (168.6-184.7)

 p-Value for Difference
 between Respondents

 Chiropractic versus
 Chiropractic Physician
 Care, 1997 Care, 2006
 versus 2006 ([double dagger])

Total U.S.
Annual per patient
 Charges 0.53 0.10
 Expenditures 0.49 0.01
Per office visit
 Charges 0.34 0.08
 Expenditures 0.20 <0.01

* Expenditures for all ambulatory services
(outpatient and office-based).

([dagger]) Expenditures for only office-based services.

([double dagger]) t-test used in mean comparisons.

CI, confidence interval.
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Title Annotation:Utilization
Author:Davis, Matthew A.; Sirovich, Brenda E.; Weeks, William B.
Publication:Health Services Research
Geographic Code:1USA
Date:Jun 1, 2010
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