Scope of Practice and Legal Boundaries of Chiropractic

The scope of practice for chiropractic consists of the procedures, actions, and processes that a licensed Doctor of Chiropractic is legally permitted to perform within a specific jurisdiction. This legal framework is significant for both patient safety and the professional identity of chiropractic, establishing the boundaries of care and distinguishing it from other health professions.¹ The scope is not nationally uniform; instead, it is defined by individual state, provincial, or territorial statutes and regulations, resulting in considerable variability that reflects a complex history of legislative battles and interprofessional dynamics ².³ This history includes a prolonged period of organized opposition from mainstream medicine, culminating in the landmark antitrust lawsuit Wilk v. American Medical Association. The 1987 district court ruling in that case found that the AMA had engaged in an unlawful conspiracy to eliminate the chiropractic profession, a decision affirmed on appeal in 1990 ⁴, ⁵, ⁶. The resolution of this case dismantled formal ethical barriers to interprofessional cooperation and was a turning point in the profession's struggle for legitimacy and a defined place in the healthcare system.⁷

The legal boundaries of chiropractic practice exist on a wide spectrum across different jurisdictions. Some states maintain a highly restrictive scope focused primarily on the spine. The California Business and Professions Code, for example, explicitly states that a chiropractic license does not authorize the practice of medicine or surgery, nor the use of any drug or medicine listed in materia medica ⁸, ⁹. In contrast, other states have legislated for a significantly more expansive scope. New Mexico allows certified "Advanced Practice" chiropractors to utilize a broad formulary that includes over-the-counter drugs, bioidentical hormones, and specific prescription substances such as procaine, epinephrine, and sarapin ¹⁰, ¹¹. Many states occupy a middle ground; Florida statutes, for instance, authorize chiropractors to provide nutritional counseling and to sell or distribute dietary supplements complementary to their care ¹², ¹³.

Despite this legal diversity, a common core of competencies is expected of all chiropractors. The National Board of Chiropractic Examiners' Part IV examination consists of seven patient encounter stations and one technique station, where candidates are graded on five components: patient evaluation, patient examination, clinical decision making and case management, interpersonal and communication skills, and documentation. ¹⁴. The Federation of Chiropractic Licensing Boards offers its "Model Practice Act for Chiropractic Regulation" as a reference for jurisdictions, defining the practice of chiropractic to include various diagnostic, analytical, and therapeutic procedures. ¹⁵. This foundational skill set has facilitated the integration of chiropractic services into mainstream healthcare settings. For example, the Veterans' Health Administration has developed integrated care pathways for low back pain involving chiropractors ¹⁶, and the American College of Physicians' 2017 guidelines give a strong, albeit evidence-qualified, recommendation for spinal manipulation as a first-line nonpharmacologic treatment for acute low back pain ¹⁷. The scope even extends into non-human care, where policy from the American Veterinary Medical Association dictates that a licensed veterinarian must supervise chiropractic treatment for animals ¹⁸, ¹⁹.

Definition and legal framework of scope of practice

The scope of practice for chiropractic is a legal and professional construct that defines the procedures, actions, and processes a chiropractor is permitted to undertake in a specific jurisdiction. Unlike some healthcare professions with a more uniform national standard, the chiropractic scope of practice is not monolithic. It is established and regulated primarily through individual state or provincial practice acts, which are laws passed by legislatures that delineate the boundaries of professional conduct. These acts create significant jurisdictional variation in what chiropractors are legally authorized to do.

Guidance for these state laws is often provided by professional bodies, most notably the Federation of Chiropractic Licensing Boards (FCLB). The FCLB develops and maintains a Model Practice Act, last updated in 2019, which serves as a template for states to use when drafting or amending their own legislation ²⁰. While the FCLB's model act does not contain a singular, concise definition of "scope of practice," its associated documents offer insight into procedures considered common to the profession ¹⁵. For instance, the FCLB's "Model Statute & Regulations for Chiropractic Assistants" outlines tasks delegated in a chiropractic setting, including the collection of patient health data and the application of physical modalities such as thermal, sound, light, and mechanical therapies ¹⁵.

The legal framework established by state practice acts results in a wide spectrum of authorized activities. Some states have adopted expansive definitions of chiropractic. Oregon, for example, defines the scope of chiropractic practice in ORS 684.010, which authorizes adjusting the articulations of the human body and employing physiotherapy, electrotherapy, and hydrotherapy. ²¹. In contrast, other states maintain a more circumscribed scope. California's Business and Professions Code § 1000-7 explicitly states that a chiropractic license does not authorize the practice of medicine, surgery, or optometry, and it specifically prohibits the use of "any drug or medicine now or hereafter included in materia medica" ⁹.

Between these two poles lie numerous variations. The Kansas statute K.S.A. Kansas statute 65-2871 defines the practice of chiropractic as the examination, analysis, and diagnosis of the human body by physical, thermal, or manual methods, and the treatment of the body by manual, mechanical, electrical, or natural methods, including the use of foods, but expressly prohibits prescribing drugs, performing surgery, or practicing obstetrics. ²². Other states grant specific, non-adjustment authorities. The 2022 Florida Statutes, under Chapter 460, explicitly authorize chiropractors to provide nutritional counseling and to sell or supply dietary supplements that are complementary to chiropractic care ¹³. This patchwork of state laws, a result of decades of legislative efforts documented in works like Walter R. Rhodes's The official history of chiropractic in Texas ²³, means that the legal boundaries of the profession are determined not by a national consensus but by the specific statutes of the jurisdiction in which a chiropractor is licensed to practice.

Historical development of legal recognition

The chiropractic profession's path to legal recognition and professional legitimacy was defined by a prolonged struggle against organized medical opposition. From the profession's founding by D. D. Palmer, documented in works like The Chiropractor ²⁴, early practitioners often faced arrest for practicing medicine without a license. This period of legal jeopardy, which extended through the mid-20th century, necessitated state-by-state legislative campaigns to establish licensing boards and define a legal scope of practice. These grassroots efforts are chronicled in regional histories such as The official history of chiropractic in Texas ²³ The history of the chiropractic profession in Wisconsin was documented by S. A. Catencamp in the 1995 book A History of Chiropractic in Wisconsin. ²⁵, which detail the persistent political and legal battles fought by chiropractors for the right to practice. The Palmer family's role in this development is extensively covered in David D. Palmer's historical account, Three generations: a history of chiropractic ²⁶.

This opposition became institutionalized within the American Medical Association (AMA), which in 1963 formed the Committee on Quackery with the explicit goal of containing and eliminating the chiropractic profession. The AMA's Principles of Medical Ethics included a provision, Principle 3, that deemed it unethical for physicians to associate professionally with "unscientific practitioners," a category into which chiropractic was placed. This policy effectively created a professional boycott, preventing referrals, hospital access, and interdisciplinary collaboration.

The turning point in this conflict was the landmark antitrust lawsuit Wilk v. American Medical Association. Filed in 1976 by chiropractor Chester A. Wilk and four other plaintiffs, the suit accused the AMA and other medical organizations of violating the Sherman Antitrust Act. After a lengthy legal battle, a 1987 federal district court ruling found that the AMA had engaged in an unlawful conspiracy to destroy the chiropractic profession ⁴. The court determined that the AMA's boycott was not based on genuine patient care concerns but rather on an anti-competitive motive. As a result, the court issued a permanent injunction against the AMA, ordering it to cease its boycott and to publish the court's findings in its official journal. The AMA appealed the decision, but the United States Court of Appeals for the Seventh Circuit affirmed the lower court's judgment on February 7, 1990 ⁵, ⁶. The Wilk decision dismantled the formal ethical ban on interprofessional referrals and association, marking a critical victory for chiropractic ⁴. This legal mandate forced a change in the AMA's official stance and was instrumental in opening pathways for greater integration of chiropractic into the broader healthcare system, fundamentally altering the profession's trajectory and public standing, as analyzed in historical works such as The Secret History of Chiropractic ².

Core competencies and authorized procedures

Across most jurisdictions, the practice of chiropractic is centered on a set of core clinical competencies related to diagnosis and manual therapy. The standards for entry-level practice are largely defined by national licensing examinations. For instance, the Part IV practical examination administered by the National Board of Chiropractic Examiners (NBCE) requires candidates to demonstrate proficiency in fundamental clinical skills ¹⁴. These include the ability to gather a comprehensive clinical history, perform thorough physical and orthopedic examinations, and utilize these findings to make appropriate clinical decisions, such as formulating a diagnosis and a plan of care ¹⁴. This examination process ensures a baseline level of competency in patient assessment before a license is granted.

The primary therapeutic procedure authorized for chiropractors is spinal manipulation, often referred to as a chiropractic adjustment. This intervention involves the application of a controlled force to a specific joint of the spine or extremities to restore proper movement and function. The techniques and theories behind these procedures are detailed in standard educational texts such as F. P. DeGiacomo's Textbook of chiropractic technique ¹. The clinical application of spinal manipulation has gained recognition from some medical organizations. A notable example is the 2017 clinical practice guideline from the American College of Physicians for noninvasive treatments for acute, subacute, and chronic low back pain ¹⁷. This guideline provides a "strong recommendation" for physicians to select nonpharmacologic treatments, specifically including spinal manipulation, as a first-line therapy. However, the same guideline qualifies this recommendation by stating that it is based on "low-quality evidence" ¹⁷.

In addition to patient assessment and spinal manipulation, the scope of chiropractic practice commonly includes a range of adjunctive physical therapies and modalities. While a universal definition of scope is not provided by the Federation of Chiropractic Licensing Boards (FCLB), its "Model Statute & Regulations for Chiropractic Assistants" outlines procedures that are common in chiropractic settings and may be delegated to trained assistants under a chiropractor's supervision ¹⁵. These authorized procedures include collecting various forms of health data from patients and the application of adjunctive therapies. The list of common modalities includes thermal therapies like heat and cold packs, sound-based treatments such as therapeutic ultrasound, the use of light therapies like low-level lasers, and various mechanical modalities, including traction and electrical muscle stimulation. The FCLB model also lists hydrotherapy as a procedure frequently found within chiropractic offices ¹⁵. These procedures are typically used to complement the chiropractic adjustment by reducing pain, inflammation, and muscle spasm.

Variations and expansions in scope by jurisdiction

The legal scope of chiropractic practice is not uniform and exhibits significant variation from one jurisdiction to another. These differences are the product of decades of distinct state-level legislative processes, regulatory board decisions, and legal challenges. The result is a complex patchwork of laws where the authority of a chiropractor in one state may bear little resemblance to that of a practitioner in a neighboring one. This disparity is clearly illustrated by comparing jurisdictions that have granted chiropractors advanced practice and prescriptive authority with those that permit more common expansions, such as nutritional counseling.

At the most expansive end of the spectrum is New Mexico, which has established a specific certification for "Advanced Practice" chiropractors. Under the New Mexico Administrative Code 16.4.15.11, chiropractors who complete the requisite advanced training and certification are granted limited prescriptive authority ¹¹. The formulary available to these practitioners is extensive and goes far beyond spinal manipulation and adjunctive modalities. It includes herbal medicines, homeopathic medicines, over-the-counter drugs, vitamins, minerals, and dietary supplements ¹⁰. Furthermore, the scope extends to the prescription of bioidentical hormones and the administration of injectable substances, including sterile water, sterile saline, sarapin for pain management, caffeine, and procaine. The New Mexico formulary also authorizes the use of oxygen, emergency epinephrine, and topical vapocoolants ¹⁰. This expansion positions these specific New Mexico chiropractors with a scope that overlaps with certain functions of primary medical care providers.

In contrast to New Mexico's broad prescriptive rights, a more common and less extensive expansion of chiropractic scope involves nutrition. Many states have legislatively authorized chiropractors to provide nutritional counseling and to supply related products. The state of Florida provides a representative example of this model. The 2022 Florida Statutes, specifically Chapter 460 on Chiropractic Medicine, outline the profession's legal boundaries ¹³. Within this chapter, section 460.403(3)(d) explicitly authorizes chiropractors to provide nutritional counseling to their patients. This statute also grants them the legal right to sell, distribute, or supply dietary supplements, with the condition that such products are complementary to the overall chiropractic care being rendered ¹². Unlike New Mexico's law, this authority does not extend to prescription drugs or injectable substances, defining a clear boundary that keeps the practice focused on non-pharmacological interventions. These divergent paths taken by New Mexico and Florida underscore the critical role that state legislatures and regulatory boards play in defining the professional identity and legal capabilities of chiropractors within their borders.

Prohibitions and legal limitations

The scope of chiropractic practice is defined as much by what chiropractors are legally prohibited from doing as by what they are permitted to do. The most common and significant limitations across nearly all jurisdictions involve restrictions on performing surgery and prescribing most pharmaceutical drugs. These prohibitions serve to legally distinguish chiropractic from the practice of allopathic and osteopathic medicine.

The state of California provides a clear and stringent example of these limitations. The California Business and Professions Code § 1000-7 explicitly states that a license to practice chiropractic "shall not authorize the practice of medicine, surgery, osteopathy, dentistry or optometry, nor the use of any drug or medicine now or hereafter included in materia medica" ⁸, ⁹. The term "materia medica" is a broad, traditional phrase encompassing all substances used in the practice of medicine, effectively creating a near-total ban on prescription pharmaceuticals for California chiropractors. This legislative boundary firmly defines chiropractic practice in the state as a form of non-pharmacological and non-surgical care.

These sharp divisions have deep historical roots, stemming from over a century of professional conflict. The American Medical Association (AMA) historically engaged in a long-running effort to contain and eliminate the chiropractic profession, a campaign found to be an unlawful conspiracy in the 1987 federal court ruling in Wilk v. AMA, a decision later affirmed on appeal by the U.S. Court of Appeals for the Seventh Circuit in 1990 ⁴, ⁶. This conflict contributed to the establishment of strict legal firewalls between the professions. The resulting state laws often reflect this history, detailed in works such as Simon A. Senzon's The Secret History of Chiropractic, by creating distinct and non-overlapping scopes of practice ².

While the prohibition on surgery and broad-spectrum pharmaceuticals is widespread, the specifics vary by jurisdiction. In contrast to California's strict stance, New Mexico has established an "Advanced Practice" certification that allows qualified chiropractors to prescribe from a specific formulary that includes substances like bioidentical hormones, procaine, and epinephrine ¹⁰, ¹¹. Similarly, Oregon's practice act, under ORS 684.025, allows certified chiropractors to perform minor surgery and suture superficial wounds ²¹. These exceptions highlight that legal boundaries are a function of state-level legislative and regulatory decisions, not a uniform national standard.

Other specific prohibitions also exist outside the domains of surgery and pharmaceuticals. A notable example is the practice of animal chiropractic. The American Veterinary Medical Association (AVMA) policy dictates that chiropractic treatment for animals is considered a veterinary modality and must be performed under the supervision, referral, or order of a licensed veterinarian ¹⁸, ¹⁹. This prevents chiropractors from establishing independent animal care practices, confining their work to a collaborative role under veterinary oversight. These legal limitations are generally consistent with chiropractic education and board certification standards. The National Board of Chiropractic Examiners (NBCE) Part IV practical examination, for instance, assesses competence in diagnosis and manual technique, but not in surgical procedures or pharmacology ¹⁴.

Interprofessional and ancillary practice areas

The scope of chiropractic is increasingly defined by its role within larger, collaborative healthcare systems and its application in specialized ancillary fields. This integration necessitates navigating complex interprofessional boundaries. A prominent example is the inclusion of chiropractic services within the United States Veterans Health Administration (VHA), the country's largest integrated health care system. Historically, such collaboration was hindered by organized opposition from medical organizations. The 1987 district court ruling in Wilk v. AMA, which was affirmed on appeal, found the American Medical Association had engaged in an unlawful conspiracy to eliminate the chiropractic profession, partly through an ethical ban on interprofessional referrals ⁴. The final appellate decision in 1990 removed these formal barriers, creating a legal foundation for future collaboration ⁵.

In the decades since, integration has become more formalized. A 2018 Delphi consensus study by Lisi, Salsbury, Hawk, and Vining sought to develop a standardized clinical pathway for chiropractors treating low back pain within the VHA ¹⁶. This study engaged a panel of 37 experts, including chiropractors and medical doctors, to establish consensus on best practices for diagnosis, treatment, and interprofessional communication. The resulting "Chiropractic Integrated Care Pathway for Low Back Pain" provides a structured protocol for chiropractors to function as part of a VHA patient's care team, outlining referral criteria, visit frequency, and specific outcome measures ¹⁶. This pathway represents a significant shift from independent practice to a defined role within a multidisciplinary, evidence-informed environment.

Another area requiring interprofessional collaboration is animal chiropractic. This practice is not an independent field but an ancillary modality within veterinary medicine. The American Veterinary Medical Association (AVMA) policy explicitly states that animal chiropractic is considered a veterinary practice and must be performed under the supervision or referral of a licensed veterinarian ¹⁸, ¹⁹. The policy requires that a veterinarian must first establish a diagnosis and a treatment plan before a patient can be referred for chiropractic care. Furthermore, the AVMA specifies that referrals should be directed to either a licensed chiropractor who has completed a post-graduate animal chiropractic certification program or a veterinarian who has undergone similar specialized training ¹⁸. This framework legally subordinates the chiropractor's role to that of the veterinarian, who retains primary responsibility for the animal's health. The chiropractor acts as a consultant or specialist provider, similar to a physical therapist in human medicine, whose services require a prescription or order from a primary physician. These structured, legally mandated collaborations in both human and animal health illustrate the evolving boundaries of the chiropractic scope of practice.

Contemporary debates and future directions

The scope of chiropractic practice is the subject of intense, ongoing debate, reflecting a long-standing division within the profession that dates back to its earliest conflicts between "straight" and "mixer" philosophies ². These contemporary debates center on the expansion of practice rights into areas overlapping with primary medical care, the role of evidence in defining professional boundaries, and the direction of future legislative efforts. A primary flashpoint is the movement in some states to grant chiropractors "advanced practice" status, which includes prescriptive authority. New Mexico provides the most expansive example of this model. Under its regulations, chiropractors with advanced certification can legally prescribe from a detailed formulary that includes not only vitamins and dietary supplements but also over-the-counter drugs, bioidentical hormones, and a range of injectable substances such as sterile water, procaine, caffeine, and sarapin ¹⁰. The formulary even includes emergency medications like epinephrine, positioning these practitioners in a role that significantly blurs the line with primary medical providers ¹⁰.

This push for an expanded scope is met with significant resistance, both from outside medical organizations and from more conservative factions within the chiropractic profession. Many states maintain a much stricter boundary. California law, for instance, explicitly states that a chiropractic license does not authorize the practice of medicine or the use of any drug or medicine found in materia medica ⁸⁹. This creates a fractured regulatory landscape where a procedure or prescription legally permitted in one state constitutes a criminal offense in another.

Simultaneously, the role of evidence in shaping practice boundaries is becoming more pronounced. The inclusion of spinal manipulation in mainstream clinical guidelines is a significant development. For example, a 2017 guideline from the American College of Physicians for acute low back pain gives a "strong recommendation" for nonpharmacologic treatments, specifically including spinal manipulation ¹⁷. This inclusion is a major professional victory and supports the integration of chiropractic into mainstream healthcare. However, the same guideline qualifies this recommendation by noting that it is based on "low-quality evidence" ¹⁷. This qualification is frequently cited by critics and researchers who argue that further scope expansion is unwarranted without a stronger evidence base. Future professional and legislative trends will likely continue to revolve around these poles: state-level legislative battles over prescriptive rights, driven by models like New Mexico's, and the increasing demand from the broader healthcare community for higher-quality evidence to validate both existing and proposed chiropractic interventions.

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