Subluxation documentation is the foundation of every Medicare chiropractic claim. Without it, nothing else matters — the AT modifier, the treatment plan, the visit notes — because Medicare will not pay for chiropractic manipulation without documented evidence of subluxation.
This guide covers exactly what Medicare requires, the two acceptable documentation methods, what auditors look for, and the specific mistakes that lead to claim denials and recoupment demands.
Why Subluxation Documentation Matters
Medicare's coverage of chiropractic care is explicitly limited to manual manipulation of the spine to correct subluxation. The term "subluxation" has a specific Medicare definition: a motion segment in which alignment, movement integrity, and/or physiological function of the spine are altered although contact between joint surfaces remains intact.
This definition is broader than a bone-out-of-place model but narrower than general spinal dysfunction. Your documentation must demonstrate that the patient's condition meets this specific definition before treatment begins.
Method 1: X-Ray Documentation
An X-ray demonstrating subluxation is the most straightforward documentation method. Requirements include:
- The X-ray must have been taken no more than 12 months prior to the start of chiropractic treatment
- The X-ray report must specifically identify subluxation — general findings like "degenerative disc disease" or "mild spondylosis" are insufficient unless they describe specific misalignment or motion segment dysfunction
- The X-ray can be taken by another provider (a radiologist, the patient's PCP, an emergency department) — it does not need to be your X-ray
- Remember that Medicare does not pay chiropractors for X-rays — only for the manipulation itself
Important: If you order an X-ray for subluxation documentation, the patient must be informed that Medicare will not cover the X-ray cost when billed by a chiropractor. Have the patient obtain the X-ray from a referring provider when possible, or obtain an ABN if you take the X-ray in your office.
Method 2: Physical Examination
If no X-ray is available, you can establish subluxation through physical examination. Medicare requires documentation of at least two of four criteria, commonly known by the mnemonic PART:
P — Pain/Tenderness
Document the specific location (spinal level), quality (sharp, dull, aching), severity (numeric pain scale or descriptive), and any referral pattern. "Low back pain" is insufficient — "sharp pain at L4-L5 rated 7/10 with referral to the left gluteal region" demonstrates the required specificity.
A — Asymmetry/Misalignment
Document observable or palpable misalignment at a specific spinal level, including the direction of misalignment. Examples: "C5 rotated right with restricted left lateral flexion" or "L4 posterior and inferior relative to L3." Vague findings like "misalignment noted in the lumbar spine" are insufficient.
R — Range of Motion Abnormality
Document specific range of motion restrictions with measured degrees compared to normal values. Example: "Cervical right rotation 45° (normal 80°), left rotation 60° (normal 80°)." Subjective assessments like "decreased range of motion" without measurements will not survive an audit.
T — Tissue/Tone Changes
Document palpable soft tissue abnormalities at the subluxation site, including muscle spasm (location and severity), edema, tenderness to palpation at specific levels, or altered muscle tone. Example: "Bilateral paravertebral muscle spasm at T6-T8, moderate, with tenderness to palpation at T7 spinous process."
Where the Documentation Must Appear
Subluxation findings must appear in the initial evaluation note — the note from the first visit. They should also be referenced in the initial treatment plan. If the patient returns for a new episode of care months later, a new subluxation assessment is required.
The treatment plan must connect the subluxation findings to specific treatment goals and a plan for chiropractic manipulative treatment. An auditor should be able to read the initial evaluation and treatment plan together and see a clear line from documented subluxation to prescribed treatment.
Common Documentation Failures
- "Subluxation present" without supporting findings — this is a conclusion, not documentation
- Only one PART criterion documented — Medicare requires two of four
- No spinal level identified — findings must be location-specific
- X-ray older than 12 months — expired X-ray evidence is treated as no evidence
- Copy-paste initial evaluations — identical subluxation findings across multiple patients suggest template use rather than individualized assessment
- Findings documented in subsequent visit notes but missing from the initial evaluation — the subluxation must be established at the first visit, not retroactively
Re-evaluation Requirements
For ongoing treatment, Medicare does not require a new subluxation assessment at every visit. However, you should update your PART findings at regular intervals — typically every 30 days or every 12 visits — as part of treatment plan updates. These re-evaluations should show whether the subluxation findings are improving, which supports your use of the AT modifier for active treatment.
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Subscribe — $247/month →The Bottom Line
Subluxation documentation is not a formality — it is the legal basis for every Medicare chiropractic payment. The practices that avoid audit problems treat the initial evaluation as a compliance document, not just a clinical note. Two of four PART criteria, documented with specificity and measurable findings, is the standard. Everything else in your Medicare billing depends on getting this right from the first visit.