Chiropractic Billing and Coding: CPT Codes and Claims
Chiropractic billing operates inside a specific set of procedural codes that determine whether a claim gets paid, denied, or audited. This page maps the core CPT codes used in chiropractic practice, explains how claims are structured, and clarifies the boundary conditions that separate covered treatment from out-of-pocket territory. Getting these distinctions right matters — not just administratively, but for patients trying to understand what their plan will actually cover.
Definition and scope
A CPT code — Current Procedural Terminology — is a five-digit numeric identifier maintained by the American Medical Association that tells a payer exactly what service was rendered. For chiropractors, the dominant billing territory centers on spinal manipulation codes, specifically the 98940–98943 series. These four codes are differentiated by a single variable: the number of spinal regions treated.
- 98940 — 1–2 spinal regions
- 98941 — 3–4 spinal regions
- 98942 — 5 spinal regions
- 98943 — Extraspinal regions (extremity or other non-spinal area)
The spinal column is divided into 5 regions for billing purposes: cervical, thoracic, lumbar, sacral, and pelvic. Selecting the wrong code — billing 98941 when documentation supports only 98940 — is a common audit trigger. CMS (Centers for Medicare and Medicaid Services) covers chiropractic manipulation under Medicare Part B, but with a hard constraint: only spinal manipulation for acute or chronic subluxation is a covered diagnosis. Everything else, including maintenance care, is statutorily excluded from Medicare reimbursement.
The regulatory context for chiropractic shapes this coding environment considerably. Documentation requirements, modifier use, and medical necessity standards all flow from federal and state-level policy, not from the profession's own preferences.
How it works
A chiropractic claim begins with the treating provider documenting the encounter — chief complaint, examination findings, treatment rendered, and the regions addressed. That documentation drives code selection, which is then transmitted to the payer on a CMS-1500 claim form alongside ICD-10 diagnosis codes. The ICD-10 code (International Classification of Diseases, 10th Revision, maintained by the World Health Organization and adapted for US use by CDC/NCHS) is not just a formality — it establishes medical necessity by linking the diagnosis to the treatment.
For Medicare specifically, chiropractors must use the AT modifier (Active Treatment) on every covered manipulation claim. Without it, Medicare interprets the service as maintenance care and denies it automatically. This modifier functions as a real-time attestation that the provider believes the patient is still in active treatment toward a therapeutic goal.
The claim then moves through a clearinghouse — an electronic intermediary that checks for formatting errors — before reaching the payer. Most commercial payers process electronically within 30 days; Medicare's standard is 14 days for clean electronic claims under the Prompt Payment Act (31 U.S.C. § 3901–3907).
For a fuller picture of how chiropractic treatment works in practice, the mechanism of spinal manipulation and its intended physiological effects add important context to why the documentation standards are structured the way they are.
Common scenarios
Three billing situations account for the majority of complications in chiropractic practices:
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Medicare maintenance care. Once a patient has plateaued — achieved the maximum benefit they are likely to gain from continued manipulation — Medicare coverage stops. The provider may still treat the patient, but must issue an Advance Beneficiary Notice (ABN), a form that shifts financial responsibility to the patient before the service is rendered. Skipping the ABN and billing Medicare anyway is a compliance violation under the False Claims Act (31 U.S.C. § 3729).
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Adjunctive services. Many chiropractic visits include more than spinal manipulation — electrical stimulation (97014 or 97032), therapeutic ultrasound (97035), massage (97124), or therapeutic exercises (97110). These codes are separately billable but require separate documentation. Bundling them into the manipulation code, or billing them without distinct time-based documentation, creates a coding error that payers and OIG auditors flag under the NCCI (National Correct Coding Initiative) edits maintained by CMS.
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Insurance verification gaps. A patient's plan may cover chiropractic at 80% after a $50 copay — but only for 20 visits per calendar year, and only when medically necessary as defined by their specific plan. Exhausting those visits without tracking them, or assuming medical necessity standards match Medicare's, generates claim denials and patient billing disputes that could have been prevented at intake.
The key dimensions and scopes of chiropractic page provides useful framing for understanding how different practice models — cash-based, insurance-based, and hybrid — create different billing environments.
Decision boundaries
The central question in chiropractic billing isn't whether a service was provided — it's whether the documentation supports the code selected, and whether the diagnosis qualifies as covered under the applicable plan. Those two variables are independent of each other, which is why a claim can fail on either axis.
For Medicare, the official guidance lives in the Medicare Benefit Policy Manual, Chapter 15, §240, which defines subluxation and sets the evidentiary requirements a provider must meet. Commercial payers maintain their own medical necessity criteria, typically published in coverage policy bulletins, which may be more or less restrictive than Medicare's.
One underappreciated distinction: the 98940–98942 codes are time-neutral — they don't require documentation of minutes spent. The 97xxx therapeutic codes, by contrast, are often time-based, requiring at least 15 minutes of direct contact per unit billed. Mixing these frameworks without recognizing the distinction produces systematic coding errors across an entire practice's billing.
Patients navigating how to get help for chiropractic care often encounter these billing structures before they fully understand what their plan covers — and the chiropractic frequently asked questions page addresses many of the coverage questions that arise at that point.