History of Chiropractic in the United States
Chiropractic care has moved from a single room above a grocery store in Davenport, Iowa, to a licensed profession practiced across all 50 US states — a journey that took roughly a century and involved no small amount of courtroom drama. The field's history is inseparable from its ongoing debates about scope, legitimacy, and the line between manual therapy and medicine. Understanding how chiropractic arrived at its current regulatory and clinical standing helps explain why its key dimensions and scopes look the way they do today.
Definition and Scope
On September 18, 1895, Daniel David Palmer administered what is widely cited as the first chiropractic adjustment to Harvey Lillard, a janitor in Palmer's building in Davenport, Iowa. Palmer was a self-educated magnetic healer who had developed a theory that misaligned vertebrae — he called them "subluxations" — interfered with the nervous system and caused disease. That one event anchors the official origin story of an entire profession.
Palmer's framing was sweeping: he believed subluxation correction could address conditions far beyond musculoskeletal pain. His son Bartlett Joshua (B.J.) Palmer took over the Palmer School of Chiropractic in 1906 and became the field's most aggressive promoter, building a radio empire and enrolling thousands of students. By the 1920s, chiropractors were practicing in every state, though frequently without legal protection.
The early decades were defined by a core tension that persists in modified form today: "straights" held to Palmer's original subluxation-only philosophy, while "mixers" incorporated other physical therapies, nutrition counseling, and broader treatment approaches. This wasn't merely philosophical — it shaped licensing battles, educational standards, and the regulatory context that governs practice now.
How It Works
Licensing arrived state by state, not through federal mandate. Kansas became the first state to license chiropractors in 1913. By 1931, 39 states had passed chiropractic practice acts. Full recognition across all 50 states wasn't complete until 1974, when Louisiana became the last holdout.
Federal recognition came through a different channel entirely. In 1972, Congress amended Medicare to include chiropractic services — specifically spinal manipulation for subluxation — making chiropractors the first non-physician, non-dentist doctoral-level health professionals included in the program. That inclusion required a defined scope: Medicare coverage remains limited to manual manipulation of the spine, a boundary established by statute and enforced by the Centers for Medicare & Medicaid Services (CMS).
Educational standardization runs through the Council on Chiropractic Education (CCE), which has served as the accrediting body recognized by the US Department of Education since 1974. Doctoral programs require a minimum of 4,200 instructional hours, a figure the CCE publishes in its accreditation standards. This structure underpins the licensing pathway described in more detail on the how it works page.
Common Scenarios
The profession's most consequential external battle came not from legislatures but from organized medicine. The American Medical Association (AMA) maintained an official policy from 1963 through 1980 classifying chiropractic as an "unscientific cult" and formally prohibiting AMA members from associating professionally with chiropractors.
That policy ended in federal court. In Wilk v. American Medical Association (1987), the US District Court for the Northern District of Illinois ruled that the AMA had engaged in an unlawful conspiracy to restrain competition, in violation of the Sherman Antitrust Act. Judge Susan Getzendanner's finding forced the AMA to publish the court's injunction in the Journal of the American Medical Association. The ruling didn't resolve scientific debates, but it fundamentally altered the legal and institutional landscape.
Post-Wilk, integration into mainstream healthcare settings accelerated. The Department of Veterans Affairs began piloting chiropractic services at VA medical centers in 2004, eventually expanding to over 60 facilities. The integration brought chiropractic into electronic health records, interdisciplinary pain teams, and evidence-based care pathways — a context quite distant from B.J. Palmer's radio broadcasts.
Decision Boundaries
The history of chiropractic regulation draws a clear line between what is professionally settled and what remains contested. The numbered sequence below maps the structural evolution:
- 1895 — D.D. Palmer's first recorded adjustment, Davenport, Iowa
- 1913 — Kansas enacts the first state chiropractic licensing law
- 1963–1980 — AMA formal anti-chiropractic policy in effect
- 1972 — Medicare inclusion, establishing federal scope limitations
- 1974 — CCE accreditation recognized by the US Department of Education; Louisiana completes all-50-state licensure
- 1987 — Wilk v. AMA antitrust ruling removes institutional prohibition on interprofessional cooperation
- 2004 — VA chiropractic integration begins
The contrast between early "straight" chiropractic and the contemporary evidence-informed model is the clearest boundary in the field's history. Modern practice increasingly anchors clinical decisions in outcomes research — a shift documented in journals such as The Spine Journal and supported by organizations including the North American Spine Society. The safety context and risk boundaries for modern chiropractic reflect this evidence-informed evolution directly.
State licensing boards, operating under individual practice acts, set the enforceable scope of practice — not a federal agency. The Federation of Chiropractic Licensing Boards (FCLB) coordinates between state boards and publishes comparative data on scope and licensing requirements, making it the practical reference point for understanding how the profession's history has translated into present-day professional rules. For anyone tracing a path from that 1895 Davenport building to a licensed modern practice, the frequently asked questions section addresses the questions that history tends to leave open.