Chiropractic Billing & Insurance 2026: Coverage Rules, Spinal Manipulation Codes & Denial Prevention

Chiropractic Billing & Insurance 2026: Coverage Rules, Spinal Manipulation Codes & Denial Prevention

Chiropractic billing carries one of the highest improper payment rates in all of Medicare — 33.6%, according to CMS's own compliance data. An OIG audit found that 82% of Medicare payments for chiropractic services were unallowable, primarily due to billing maintenance care as active treatment. For chiropractic practices, this creates a billing environment where documentation precision, modifier accuracy, and payer-specific rule compliance are not optional — they are existential.

The core challenge is straightforward but unforgiving: Medicare only covers manual spinal manipulation to correct a subluxation, and only when the treatment is active and corrective rather than maintenance. Every claim must carry the AT modifier. Every visit must be supported by documentation showing measurable improvement. And the line between active treatment and maintenance care — the line that determines whether Medicare pays or denies — is drawn visit by visit in your clinical notes.

This guide walks through the 2026 chiropractic billing landscape: Medicare and commercial payer coverage rules, spinal manipulation CPT codes, modifier requirements, documentation standards, and the denial prevention strategies that keep your practice compliant and your revenue intact.

Spinal Manipulation CPT Codes: 98940, 98941, 98942

Chiropractic manipulative treatment (CMT) is billed using three CPT codes, differentiated solely by the number of spinal regions treated. The code selection must match the regions documented in the treatment note — coding a higher number of regions than documented is upcoding and a direct audit trigger.

CPT Code

Description

Spinal Regions

2026 Billing Notes

98940

CMT, spinal, 1-2 regions

1-2

Most commonly billed chiropractic code; document each region treated with specific findings

98941

CMT, spinal, 3-4 regions

3-4

Requires documentation of subluxation or dysfunction in each of the 3-4 regions treated

98942

CMT, spinal, 5 regions

5

Highest-level spinal CMT; all five regions must be individually documented with clinical findings

98943

CMT, extraspinal, 1 or more regions

Extraspinal

NOT covered by Medicare; commercial coverage varies; includes extremity manipulation

 

The Five Spinal Regions

CMS defines five spinal regions for CMT billing purposes. Each region treated must be individually documented with subluxation findings:

Region

Anatomical Area

M99.0x Code

1. Cervical

C1-C7 (atlas through C7)

M99.01

2. Thoracic

T1-T12 (upper and mid back)

M99.02

3. Lumbar

L1-L5 (lower back)

M99.03

4. Sacral

Sacrum (S1-S5)

M99.04

5. Pelvic

Ilium, ischium, pubis, sacroiliac joint

M99.05

 

Medicare Coverage Rules for Chiropractic Services in 2026

Medicare's coverage of chiropractic services is narrower than most providers and patients realize. Understanding exactly what Medicare covers — and does not cover — is the foundation of compliant chiropractic billing.

What Medicare Covers

  • Spinal CMT only: Manual manipulation of the spine to correct a subluxation — this is the only chiropractic service Medicare Part B covers
  • Cost-sharing: Medicare pays 80% of the approved amount after the $283 Part B deductible (2026) is met; the patient is responsible for 20% coinsurance
  • No visit limit: No annual visit cap — Medicare does not impose a hard limit on the number of chiropractic visits, but every visit must demonstrate medical necessity and measurable improvement

What Medicare Does NOT Cover

  • E/M services: E/M visits (99202-99215) — Medicare does not reimburse chiropractors for evaluation and management services

  • X-rays: X-rays ordered by the chiropractor (use modifier GY; patient-ordered X-rays by a physician to confirm subluxation may be covered separately)
  • Ancillary services: Extraspinal manipulation (98943), massage therapy, acupuncture, physical therapy modalities, or any other adjunctive service
  • Maintenance care: Maintenance therapy — any treatment that seeks to maintain the current condition or prevent deterioration rather than produce measurable functional improvement

The AT Modifier: Active Treatment vs. Maintenance Care

The AT (Active Treatment) modifier is the single most important compliance element in chiropractic Medicare billing. Without the AT modifier on CPT codes 98940, 98941, or 98942, the claim is automatically denied by the MAC without adjudication. But appending AT when the treatment is actually maintenance care is a compliance violation that can trigger recoupment, audit, and fraud referral.

Criteria

Active Treatment (AT Modifier Appropriate)

Maintenance Care (AT Modifier NOT Appropriate)

Treatment goal

Correcting an acute or chronic subluxation with the expectation of measurable improvement

Maintaining current condition, preventing deterioration, or providing comfort without expected improvement

Documentation requirement

Each visit documents specific subluxation findings, treatment provided, and measurable progress toward treatment goals

Patient has reached maximum therapeutic benefit (MTB); no further improvement is expected

Medicare coverage

Covered — bill 98940/98941/98942 with AT modifier

NOT covered — bill with GA modifier (if ABN signed) or do not bill Medicare

Clinical indicators

Pain reduction on VAS scale, increased ROM, improved functional status, reduced disability scores

Stable symptoms, no measurable change in ROM or function over last 2-4 visits

Audit risk

Low risk if documentation supports active treatment at each visit

High risk — OIG audits specifically target AT modifier use on maintenance care

 

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Essential Chiropractic Billing Modifiers

Chiropractic billing relies on a specific set of modifiers, and improper modifier use accounts for 31% of chiropractic claim denials. Each modifier carries distinct clinical and billing implications that vary by payer.

Modifier

Description

When to Use

Common Error

AT

Active Treatment

Every Medicare claim for CMT (98940-98942) when treatment is corrective and active — not maintenance

Appending AT to maintenance care claims; triggers audit and recoupment

GA

ABN on file — expects Medicare denial

When providing maintenance care and the patient has signed an Advance Beneficiary Notice of Noncoverage

Using GA without a properly executed ABN on file; patient cannot be billed without valid ABN

GY

Statutorily excluded service

For services Medicare never covers regardless of circumstance — X-rays, exams, 98943, physical therapy modalities by chiropractors

Using GY on maintenance CMT (should be GA with ABN); GY means the service category is excluded

GZ

Expects denial — no ABN on file

When providing a service expected to be denied and no ABN was obtained

Using GZ means the provider cannot bill the patient; revenue is lost — always get the ABN and use GA instead

25

Significant, separately identifiable E/M

When billing E/M on the same day as CMT for commercial payers (not Medicare — Medicare doesn't cover chiro E/M)

Appending -25 for Medicare patients where E/M is not covered regardless of modifier

59

Distinct procedural service

When multiple procedures are performed and need to be unbundled to avoid NCCI edit denials

Overuse of -59 for services that are truly bundled; triggers audit flags

 

Documentation Requirements for Medicare Chiropractic Claims

The 33.6% improper payment rate in chiropractic is driven almost entirely by documentation failures. CMS requires specific documentation elements for every chiropractic visit, and the absence of any element can result in denial or recoupment.

Documentation Element

What Must Be Documented

Where It Fails

Subluxation identification

Specific spinal level(s) of subluxation identified by X-ray or physical examination (PART criteria: Pain/tenderness, Asymmetry, Range of motion abnormality, Tissue/tone changes)

Using generic terms like 'spinal misalignment' without specifying the vertebral level or PART findings

Treatment plan

Diagnosis, treatment goals, frequency and duration of treatment, expected functional improvement timeline

Open-ended treatment plans with no defined goals or endpoint; triggers maintenance care determination

Visit-level progress notes

Date, regions treated, specific techniques used, patient's subjective response, objective findings, assessment of progress, plan for next visit (SOAP format)

Cookie-cutter notes that repeat identical language across visits without documenting actual progress

Functional outcome measures

Validated outcome tools — Visual Analog Scale (VAS), Oswestry Disability Index (ODI), Neck Disability Index (NDI), or comparable standardized measures

No baseline scores, no re-assessment intervals, no documentation of measurable improvement

Re-evaluation intervals

Periodic reassessment (typically every 30 days or 12 visits) documenting continued medical necessity for ongoing care

Treating beyond 30 days without reassessment; continues billing AT without evidence of ongoing improvement

X-ray or physical exam for subluxation

Initial subluxation must be documented by X-ray or physical examination within 12 months prior to or at the time of initial treatment

Missing initial subluxation documentation; treating based on patient self-report alone

 

Commercial Insurance Coverage for Chiropractic in 2026

Approximately 75-80% of commercial health insurance plans include chiropractic care as a covered benefit in 2026. However, coverage depth varies dramatically by plan, and the rules are substantially different from Medicare.

Coverage Element

Typical Commercial Plan

Key Billing Implication

Visit limits

12-30 visits per calendar year (most common: 20 visits)

Track visit counts per patient per plan year; submit request for additional visits before limit is reached

Dollar caps

Some plans use $500-$2,000 annual dollar caps instead of visit limits

Monitor accumulated charges against cap; alert patient when approaching limit

Prior authorization

Often required after initial 6-10 visits; varies by plan

Failure to obtain PA after the trigger visit is a leading cause of retrospective denials that cannot be recovered

E/M coverage

Most commercial plans cover chiropractic E/M (99202-99215) — unlike Medicare

Bill E/M with modifier -25 when performed on same day as CMT; document separately

Extraspinal coverage

Many commercial plans cover 98943 (extraspinal manipulation)

Verify coverage before billing; some plans cover with no modifier, others require documentation of medical necessity

Ancillary services

Physical therapy modalities (97110, 97140, 97530), therapeutic exercise often covered

Bill ancillary services with appropriate CPT codes; check plan for inclusion/exclusion

Reimbursement rates

Typically 30-50% below provider fee schedule for in-network contracts

Negotiate rates during credentialing; track allowed amounts against contracted rates for accuracy

 

Common ICD-10 Codes for Chiropractic Claims (Connector-Verified)

For Medicare chiropractic claims, the primary diagnosis must be an M99.0x subluxation code corresponding to the spinal region treated. Secondary neuromusculoskeletal diagnoses support medical necessity but cannot stand alone as the primary diagnosis for CMT. All codes below have been verified through the ICD-10 diagnostic code connector as HIPAA-valid.

ICD-10 Code

Description

Chiropractic Billing Context

M99.01

Segmental and somatic dysfunction of cervical region

Primary Dx for cervical CMT; must be paired with documented cervical subluxation findings

M99.02

Segmental and somatic dysfunction of thoracic region

Primary Dx for thoracic CMT; requires specific thoracic level and PART criteria

M99.03

Segmental and somatic dysfunction of lumbar region

Most common chiropractic primary Dx; must document specific lumbar level of subluxation

M99.04

Segmental and somatic dysfunction of sacral region

Primary Dx for sacral/SI joint CMT; document sacral subluxation findings

M54.50

Low back pain, unspecified

Secondary Dx supporting medical necessity; cannot be primary for Medicare CMT claims

M54.2

Cervicalgia

Secondary Dx for neck pain; supports cervical CMT medical necessity

M54.16

Radiculopathy, lumbar region

Secondary Dx indicating nerve root involvement; supports higher-level MDM for E/M (commercial only)

M47.816

Spondylosis without myelopathy or radiculopathy, lumbar region

Secondary Dx for degenerative spine changes; supports ongoing treatment necessity

 

CMS Local Coverage Determinations for Chiropractic

Chiropractic services are governed by Local Coverage Determinations issued by the Medicare Administrative Contractors. These LCDs define the documentation requirements, coverage criteria, and billing rules specific to your MAC jurisdiction. Your billing team must know which LCD applies to your practice location.

LCD ID

Title

MAC Contractor

Key Provisions

L37254

Chiropractic Services

CGS Administrators (MAC Part A/B)

Updated January 2026; defines subluxation documentation requirements, PART criteria, active treatment standards, and re-evaluation intervals

L37387

Chiropractic Services

Palmetto GBA (MAC Part B)

Defines coverage for CMT 98940-98942; requires X-ray or physical exam documentation of subluxation; outlines maintenance care exclusion

 

Top Chiropractic Billing Denials and How to Prevent Them

Denial Reason

Root Cause

Prevention Strategy

Missing AT modifier

CMT claim submitted without AT modifier on 98940-98942 for Medicare

Automated claim scrub: reject any Medicare CMT claim missing the AT modifier before submission

Maintenance care billed as active treatment

AT modifier used when documentation shows no measurable improvement over last 2-4 visits

Implement 30-day reassessment protocol; if no improvement documented, transition to ABN + GA modifier

Missing subluxation documentation

Initial subluxation not confirmed by X-ray or physical exam within required timeframe

Intake checklist requiring documented subluxation findings (PART criteria or X-ray) before first CMT claim is submitted

Cookie-cutter documentation

Visit notes are identical or near-identical across multiple visits; no individualized findings

Note template with required variable fields; audit sample of notes weekly for documentation quality

No functional outcome measures

Improvement claimed but not supported by validated measurement tools (VAS, ODI, NDI)

Require baseline outcome scores at intake and reassessment every 12 visits or 30 days

E/M billed to Medicare

Chiropractor bills 99202-99215 to Medicare, which does not cover chiropractic E/M services

Payer-specific billing rules: flag and suppress E/M codes on Medicare chiropractic claims

Exceeding commercial visit limits

CMT billed beyond the plan's annual visit cap without authorization for additional visits

Patient-level visit counter; alert at 80% of visit limit; initiate PA request before limit is reached

Missing ABN for maintenance care

Maintenance care provided without signed ABN; provider cannot bill Medicare or patient

Protocol: when AT criteria no longer met, obtain ABN before next visit; use GA modifier on subsequent claims

 

Frequently Asked Questions

Q: What does Medicare cover for chiropractic services?

A: Medicare Part B covers only one chiropractic service: manual manipulation of the spine to correct a subluxation. This is billed using CPT codes 98940 (1-2 regions), 98941 (3-4 regions), or 98942 (5 regions) with the AT modifier to indicate active treatment. Medicare does not cover chiropractic E/M visits, X-rays ordered by chiropractors, extraspinal manipulation (98943), physical therapy modalities, massage therapy, or maintenance care. Medicare pays 80% of the approved amount after the $283 Part B deductible.

Q: What is the AT modifier and when must it be used?

A: The AT (Active Treatment) modifier must be appended to every Medicare claim for spinal manipulation (98940-98942) when the treatment is active and corrective rather than maintenance care. Without the AT modifier, the claim is automatically denied. The AT modifier signals that the patient has a subluxation being actively corrected with the expectation of measurable improvement. It should NOT be used when the patient has reached maximum therapeutic benefit and treatment has transitioned to maintenance care.

Q: What is the difference between active treatment and maintenance care?

A: Active treatment is corrective care aimed at producing measurable functional improvement — documented through outcome measures like VAS pain scores, range of motion improvement, and disability index changes. Maintenance care is treatment that seeks to maintain the current condition, prevent deterioration, or provide comfort without expectation of further improvement. Medicare covers active treatment but does not cover maintenance care. An OIG audit found that 82% of improper Medicare chiropractic payments were for maintenance care billed as active treatment.

Q: What ICD-10 codes should be used as the primary diagnosis for Medicare chiropractic claims?

A: The primary diagnosis for Medicare chiropractic claims must be an M99.0x subluxation code corresponding to the spinal region treated: M99.01 (cervical), M99.02 (thoracic), M99.03 (lumbar), M99.04 (sacral), or M99.05 (pelvic). Secondary neuromusculoskeletal diagnoses such as M54.50 (low back pain) or M54.2 (cervicalgia) may be added to support medical necessity but cannot serve as the primary diagnosis for CMT claims.

Q: How many chiropractic visits does Medicare allow per year?

A: Medicare does not impose a hard annual visit cap for chiropractic services. However, every visit must be supported by documentation demonstrating medical necessity and measurable improvement. High utilization patterns — especially sustained high-frequency treatment beyond 30 days without documented reassessment — can trigger review by your Medicare Administrative Contractor. Most commercial plans do impose visit limits, typically 12-30 visits per calendar year, with some using dollar caps instead.

Q: What should a chiropractor do when a patient transitions from active treatment to maintenance care?

A: When a patient reaches maximum therapeutic benefit and no further measurable improvement is expected, the chiropractor should stop using the AT modifier, obtain a signed Advance Beneficiary Notice of Noncoverage (ABN) from the patient explaining that Medicare will not cover maintenance care, and bill subsequent maintenance CMT claims with modifier GA (indicating ABN on file). The patient then becomes financially responsible for the service. Continuing to bill with the AT modifier after improvement has plateaued is the leading cause of Medicare chiropractic recoupments.

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