Bone (Mineral) Density Studies — NCD 256 | CMS Coverage Update

TL;DR: The Centers for Medicare & Medicaid Services modified NCD 256 governing Medicare bone mass measurement coverage, effective January 9, 2026. Coverage conditions now redirect entirely to chapter 15, section 80.5 of the Medicare Benefit Policy Manual. Here's what billing teams need to do.

CMS updated the NCD 256 Medicare bone mass measurement coverage policy. The change is a structural redirection — the National Coverage Determination no longer houses the actual coverage criteria. Instead, CMS points billing teams to chapter 15, section 80.5 of Pub. 100-02 (Medicare Benefit Policy Manual) for indications and limitations, and to chapter 13, section 140 of Pub. 100-04 (Medicare Claims Processing Manual) for billing guidelines. The policy does not list specific CPT or HCPCS codes. Bone density study billing now depends entirely on the manual references listed below.

Quick-Reference Table

CMS Bone Mass Measurement Coverage Criteria and Medical Necessity Requirements 2026

NCD 256 is the National Coverage Determination governing Medicare bone mass measurement (BMM) coverage. As of January 9, 2026, the NCD itself no longer contains the coverage conditions. CMS moved them to chapter 15, section 80.5 of the Medicare Benefit Policy Manual (Pub. 100-02).

This matters for your billing team because the NCD 256 document is what most people reference first. If you're verifying medical necessity criteria from the NCD page directly, you're now reading a pointer document — not the actual criteria. Your medical necessity review, your documentation checklists, your prior authorization packets — all of these need to trace back to the Benefit Policy Manual, not the NCD text.

The real substance of this coverage policy lives at two CMS locations:

Two transmittals also govern this change: Transmittal 1236 (Medicare Claims Processing) and Transmittal 1416 (Medicare Claims Processing). These are your billing guidelines source documents for bone density study billing under Medicare.

The medical necessity criteria themselves haven't disappeared — they've been relocated. CMS has long covered BMMs under section 1861(rr) of the Social Security Act for qualified individuals at risk for osteoporosis. What changed is where you find those criteria. Your billing team needs to know which document to open.

The benefit category for these services is Bone Mass Measurement. That classification hasn't changed. What has changed is the authoritative location for coverage rules.

If your practice uses a prior authorization workflow tied to NCD 256's listed criteria, review those workflows now. If your prior auth template references NCD 256 criteria by section, update it to reference Pub. 100-02, chapter 15, section 80.5 instead.

Coverage Indications at a Glance

NCD 256 itself no longer contains indication-level coverage criteria. The table below reflects what the NCD now references and where each piece of the coverage framework lives.

This is a pointer structure, not a criteria-in-document structure. Every coverage decision traces back to the manual chapters, not the NCD page itself.

CMS Bone Mass Measurement Billing Guidelines and Action Items 2026

This change is operationally straightforward but easy to get wrong in practice. Here's what to do before January 9, 2026.

1. Pull the current version of Pub. 100-02, chapter 15, section 80.5.
Download it directly from CMS. Read it. Don't assume your current documentation checklist already matches it. Verify line by line.

2. Pull the current version of Pub. 100-04, chapter 13, section 140.
This is your authoritative claims processing source for bone density study billing. If your billing team's reference sheet still points to NCD 256 as the primary source for billing rules, update it now.

3. Update any internal policy references that cite NCD 256 as the criteria document.
NCD 256 is now a redirect. Any training materials, coder reference sheets, or denial appeal templates that quote coverage criteria from NCD 256 directly are quoting a shell. Replace those citations with the Pub. 100-02 chapter 15 reference.

4. Review your denial management workflow.
If you receive a claim denial for a bone mass measurement and your appeal cites NCD 256 criteria, that appeal may be weaker than it should be. Rebuild your appeal language around Pub. 100-02, chapter 15, section 80.5. Quote the manual directly.

5. Verify your prior authorization documentation.
Prior auth packets for bone mass measurements submitted to Medicare Administrative Contractors (MACs) should reference the Benefit Policy Manual, not NCD 256. Some MACs cross-reference local coverage determination (LCD) policies alongside the NCD. Check with your MAC to confirm whether any LCD for bone mass measurement applies to your jurisdiction — LCDs can impose additional criteria beyond the national policy.

6. Confirm your reimbursement logic hasn't been affected.
This policy change moves the criteria, not the coverage itself. But any workflow that automates eligibility checks or reimbursement projections based on NCD 256 content should be reviewed. If your RCM software pulls NCD 256 to validate claims, verify it's actually reaching the Benefit Policy Manual criteria — or flag those claims for manual review.

If you're not sure how your practice management system handles NCD redirects, talk to your billing consultant or compliance officer before the January 9, 2026 effective date. This is a low-drama change administratively, but it creates real claim denial exposure if your team is working from an outdated source.

CPT, HCPCS, and ICD-10 Codes for Bone Mass Measurement Under NCD 256

The updated NCD 256 policy does not list specific CPT, HCPCS, or ICD-10 codes. CMS has moved all applicable code references to the manual documents cited above.

For bone density study billing, the specific procedure codes and applicable diagnosis codes are defined in:

• Pub. 100-02, chapter 15, section 80.5 — for covered indications
• Pub. 100-04, chapter 13, section 140 — for claims processing code-level instructions

Do not bill bone mass measurements based on code lists from the NCD 256 page. Go directly to the source manuals.

This is the real issue with how CMS structured this update. Billing teams that rely on the NCD document as a one-stop reference are now working with incomplete information. The codes, the criteria, and the claims instructions all live elsewhere. That's a workflow problem your team needs to account for before claims go out the door.

Common CPT codes historically associated with Medicare bone mass measurements — including DXA scans — are documented in Transmittal 1236 and Transmittal 1416 linked in the policy. Pull those transmittals if you need code-level detail. Don't assume the codes you've been billing are still aligned without verifying against the current transmittal text.