Medicare Coverage for Chiropractic Services

Medicare coverage for chiropractic services is narrowly defined by federal statute and Centers for Medicare & Medicaid Services (CMS) policy, creating specific eligibility conditions that differ substantially from commercial insurance frameworks. This page explains what Medicare Part B covers, how billing and documentation requirements work, and where coverage ends. Understanding these boundaries is critical for both beneficiaries seeking spinal care and for providers navigating chiropractic billing and coding obligations under federal rules.

Definition and scope

Medicare Part B covers chiropractic services only for manual manipulation of the spine to correct a subluxation — a term defined in CMS policy as a displacement of one or more vertebrae from the normal position in the spinal column (CMS Medicare Benefit Policy Manual, Chapter 15, §240). The statute governing this benefit is codified at 42 U.S.C. § 1395x(r), which establishes the doctor of chiropractic as a recognized Medicare provider exclusively for this function.

The coverage definition carries two firm classification boundaries:

• Covered service: Manual spinal manipulation when a subluxation is documented as clinically demonstrable, performed by a licensed Doctor of Chiropractic (DC).
• Non-covered services: Diagnostic imaging ordered by the chiropractor (e.g., X-rays), physical therapy modalities, massage, maintenance care once a patient has reached maximum therapeutic benefit, and all services to extremities.

This narrow scope means that even when a DC provides a service that falls within the chiropractic scope of practice under state law, Medicare does not reimburse it unless it meets the spinal subluxation correction standard. CMS assigns the primary HCPCS/CPT codes for covered manipulation — 98940, 98941, and 98942 — corresponding to manipulation of 1–2, 3–4, and 5 spinal regions respectively.

How it works

Medicare Part B applies a standard cost-sharing model to covered chiropractic visits. After the annual Part B deductible is met — set at $240 for 2024 (CMS Medicare Part B Costs) — Medicare pays 80 percent of the Medicare-approved amount, and the beneficiary is responsible for the remaining 20 percent coinsurance. Medigap supplemental policies may cover that coinsurance depending on plan type.

Documentation requirements are more stringent for chiropractic claims than for most Part B services. CMS mandates that each claim include:

1. An AT modifier — a two-character code appended to the manipulation CPT code signifying that the service is for active/curative treatment, not maintenance care.
2. Subluxation documentation — established either by X-ray or by physical examination findings that meet CMS's defined criteria, including range-of-motion loss, muscle spasm, or asymmetry with pain and tenderness.
3. Initial and subsequent visit documentation — CMS distinguishes initial treatment documentation (demonstrating the subluxation existed) from ongoing visit records (demonstrating continued active improvement).

Chiropractors who participate in Medicare must accept assignment, meaning they agree to accept the Medicare-approved amount as payment in full and cannot bill the patient above that rate. Non-participating providers may charge up to 115 percent of the Medicare fee schedule, but this situation is uncommon given the incentive structure of Medicare participation.

Medicare does not cover an "annual wellness visit" or exam performed by a DC. If a DC performs a general evaluation not tied directly to spinal manipulation for subluxation, the claim will be denied. CMS's Program Transmittals detail these distinctions through the Medicare Administrative Contractors (MACs) that process regional claims.

Common scenarios

Scenario 1 — Acute low back pain with documented subluxation
A Medicare beneficiary presents with acute lumbar pain. A physical examination documents restricted range of motion, paraspinal muscle spasm, and point tenderness consistent with lumbar subluxation. The DC performs manipulation of 3 spinal regions (CPT 98941) and appends the AT modifier. Medicare reimburses 80 percent of the approved amount after the deductible. This represents the textbook covered encounter. For clinical context on this condition, see chiropractic for back pain.

Scenario 2 — Maintenance care after plateau
A beneficiary with chronic neck pain has received 12 weeks of chiropractic manipulation and has reached a stable functional level with no further measurable improvement documented. CMS policy defines this as "maintenance therapy," which is explicitly excluded from coverage. The DC may still provide care, but must issue an Advance Beneficiary Notice of Noncoverage (ABN) so the patient understands they will bear full cost. This scenario is one of the most common sources of claim denial and beneficiary complaints to Medicare. For related coverage detail, see chiropractic for neck pain.

Scenario 3 — Diagnostic imaging ordered by DC
A DC orders spinal X-rays to evaluate a new patient and submits the cost under the patient's Medicare Part B. The claim is denied — Medicare does not cover X-rays or other diagnostic imaging when ordered by a chiropractor. If imaging is clinically necessary, a different qualified provider (such as a primary care physician) must order it for Medicare to consider reimbursement under applicable imaging benefits. See chiropractic X-ray and diagnostic imaging for context on how DCs use imaging in practice.

Decision boundaries

The critical regulatory distinction in Medicare chiropractic coverage is active/curative care versus maintenance care. CMS policy, as reflected in the Medicare Benefit Policy Manual Chapter 15, establishes that coverage applies only while the patient is making documented, measurable functional improvement toward a therapeutic goal. Once improvement plateaus — regardless of whether ongoing manipulation prevents deterioration — the service no longer qualifies for reimbursement under Part B.

A secondary decision boundary involves provider type. Medicare Part B coverage for chiropractic manipulation is restricted to licensed Doctors of Chiropractic. Physical therapists, osteopathic physicians, or medical doctors performing spinal manipulation bill under different provider-type rules and different CPT code sets. This contrasts with the broader chiropractic vs. other healthcare providers landscape, where scope distinctions vary widely by state and payer.

A third boundary concerns geographic and plan variation under Medicare Advantage. Beneficiaries enrolled in Medicare Advantage (Part C) plans may have expanded chiropractic benefits — including coverage for maintenance care or extremity manipulation — because private insurers administering these plans can offer benefits beyond Original Medicare's minimums. The CMS annual Call Letter governs what Advantage plans may offer, but individual plan benefit documents control the actual coverage terms for each enrollee.

The chiropractic insurance coverage guide provides a broader framework for understanding how chiropractic benefits are structured across Medicare, Medicaid, and commercial payers, including how the coverage architecture for chiropractic for older adults and seniors intersects with Medicare eligibility.

References

• CMS Medicare Benefit Policy Manual, Chapter 15 — Covered Medical and Other Health Services (§240 Chiropractic Services)
• Medicare.gov — Part B Costs (2024)
• 42 U.S.C. § 1395x(r) — Social Security Act, Definition of Chiropractic Services
• Social Security Fairness Act of 2023, Pub. L. 118-310 (enacted January 5, 2025) — This law repealed the Windfall Elimination Provision (WEP) and the Government Pension Offset (GPO), effective for benefits payable for months after December 2023. The repeal increases Social Security benefit amounts for certain public-sector retirees — including some retired teachers, police officers, and other government employees — who also receive government pensions. It does not alter Medicare Part B chiropractic coverage rules, CMS reimbursement policy, or any aspect of Medicare eligibility or cost-sharing for chiropractic services. Beneficiaries who receive retroactive or increased Social Security payments as a result of this law should be aware that higher Social Security income may affect their Medicare premium brackets under Income-Related Monthly Adjustment Amount (IRMAA) calculations in subsequent years; the Social Security Administration (SSA) began issuing retroactive payments and implementing benefit increases in early 2025. Chiropractic coverage determinations under Part B remain entirely unaffected by this law.
• CMS — Advance Beneficiary Notice of Noncoverage (ABN)
• CMS HCPCS/CPT Code Reference — Chiropractic Manipulation Codes 98940–98942
• CMS Medicare Advantage and Part D — Annual Call Letter