Objective: The purpose of this study was to examine the extent to which access to chiropractic care affects medical service use among older adults with spine conditions.

Methods: We used Medicare claims data to identify a cohort of 39,278 older adult chiropractic care users who relocated during 2010-2014 and thus experienced a change in geographic access to chiropractic care. National Plan and Provider Enumeration System data were used to determine chiropractor per population ratios across the United States. A reduction in access to chiropractic care was defined as decreasing 1 quintile or more in chiropractor per population ratio after relocation. Using a difference-in-difference analysis (before versus after relocation), we compared the use of medical services among those who experienced a reduction in access to chiropractic care versus those who did not.

Results: Among those who experienced a reduction in access to chiropractic care (versus those who did not), we observed an increase in the rate of visits to primary care physicians for spine conditions (an annual increase of 32.3 visits, 95% CI: 1.4-63.1 per 1,000) and rate of spine surgeries (an annual increase of 5.5 surgeries, 95% CI: 1.3-9.8 per 1,000). Considering the mean cost of a visit to a primary care physician and spine surgery, a reduction in access to chiropractic care was associated with an additional cost of $114,967 per 1,000 beneficiaries on medical services ($391 million nationally).

Conclusions: Among older adults, reduced access to chiropractic care is associated with an increase in the use of some medical services for spine conditions.

Author keywords: Chiropractic; Back Pain; Health Services Accessibility

Author affiliations: MD, OY, HL: Department of Systems, Populations, and Leadership University of Michigan, Ann Arbor, Michigan; BA: Palmer Center for Chiropractic Research, Palmer College of Chiropractic, Davenport, Iowa; JB: Department of Internal Medicine, Geriatric and Palliative Medicine; University of Michigan Medical School, Ann Arbor, Michigan
Corresponding author: Matthew Davis—mattadav@umich.edu

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