TL;DR: The Centers for Medicare & Medicaid Services modified NCD 38, the National Coverage Determination governing obesity treatment coverage policy, effective January 9, 2026. The core change: section 40.5 has been removed from the NCD Manual and folded into NCD 100.1. Here's what billing teams need to do.
CMS obesity treatment billing has a structural shift as of January 9, 2026. The Centers for Medicare & Medicaid Services pulled section 40.5 out of NCD 38 entirely and merged it into NCD 100.1. This isn't a clinical coverage change on its own — but it will affect where your team looks for billing guidance, what your MACs reference during audits, and how you document medical necessity for obesity-related services billed to Medicare.
This policy does not list specific CPT or HCPCS codes within NCD 38 itself. Coverage details — including applicable procedure codes — now live in the cross-referenced NCDs: 100.1, 100.8, and 100.11.
Quick-Reference Table
| Field | Detail |
|---|---|
| Payer | CMS (Centers for Medicare & Medicaid Services) |
| Policy | Treatment of Obesity — NCD 38 |
| Policy Code | NCD 38 |
| Change Type | Modified |
| Effective Date | January 9, 2026 |
| Impact Level | Medium |
| Specialties Affected | Primary care, internal medicine, endocrinology, behavioral health, nutrition/dietetics |
| Key Action | Update your internal policy references to pull obesity billing guidelines from NCD 100.1 instead of NCD 38, section 40.5 |
CMS Obesity Treatment Coverage Policy and Medical Necessity Requirements 2026
NCD 38 is the National Coverage Determination that has historically governed Medicare's coverage of obesity treatment services. As of January 9, 2026, section 40.5 no longer exists within NCD 38. CMS moved that content into NCD 100.1.
That cross-reference matters. If your team has been citing NCD 38, section 40.5 as the basis for medical necessity on obesity-related claims, that citation is now stale. An auditor pulling your documentation will look for alignment with NCD 100.1.
CMS also points billing teams to NCD 100.8 and NCD 100.11 as cross-references within the updated NCD 38. If your patients receive obesity treatment alongside cardiac-related services, those NCDs may be part of your coverage policy framework. Verify the scope of each at app.payerpolicy.org/p/cms/38-v4.s below — the NCD 38 source data does not describe their contents in detail.
The real issue here is that structural NCD changes like this one create a gap between what's in your billing team's reference library and what CMS actually enforces. If your charge capture workflows, payer policy binders, or internal coding guides reference "NCD 38, section 40.5," those references are now wrong. Update them before you bill another obesity-related claim to Medicare.
Medical necessity documentation for these services must align with the criteria in NCD 100.1, not the retired section 40.5. Pull NCD 100.1 directly from CMS and read it. If you haven't built your documentation templates around NCD 100.1's specific criteria, do that now.
CMS Obesity Treatment Coverage Criteria: What NCD 100.1 Now Controls
Because section 40.5 now lives inside NCD 100.1, that NCD is the authoritative source for obesity treatment billing guidelines under Medicare.
The operative coverage criteria now live in NCD 100.1. NCD 38 itself does not enumerate them. Your billing team must retrieve NCD 100.1 directly to identify current coverage thresholds, eligible providers, and setting requirements.
Go to the source: CMS NCD 100.1. Do not rely on summaries — read the actual NCD before you bill another obesity-related Medicare claim.
Reimbursement for these services runs through the Physicians' Services and "incident to a physician's professional service" benefit categories. Both are listed in NCD 38's benefit category section. Services furnished incident to a physician's professional service must meet the standard incident-to requirements, including direct supervision.
Coverage Indications at a Glance
| Indication | Status | Relevant Codes | Notes |
|---|---|---|---|
| Intensive behavioral therapy for obesity | Covered — see NCD 100.1 | See NCD 100.1 | Retrieve current criteria directly from NCD 100.1 |
| Obesity treatment in context of cardiovascular-related services | See NCD 100.11 | See NCD 100.11 | Cross-referenced from NCD 38; verify scope at source |
| Services cross-referenced to NCD 100.8 | See NCD 100.8 | See NCD 100.8 | Cross-referenced from NCD 38; verify scope at source |
| Obesity treatment services billed incident to physician | Covered when incident-to criteria met | Physicians' Services benefit category | Direct supervision required; document accordingly |
| Section 40.5 obesity criteria (former NCD 38) | No longer a standalone reference | N/A | Incorporated into NCD 100.1 as of January 9, 2026 |
CMS Obesity Treatment Billing Guidelines and Action Items 2026
These are the steps your billing team and coding staff need to take before submitting another obesity-related Medicare claim.
| # | Action Item |
|---|---|
| 1 | Pull NCD 100.1 and make it your primary reference. Section 40.5 of NCD 38 is gone. Every internal guide, payer policy binder, or charge capture rule that cites "NCD 38, section 40.5" needs to be updated to point to NCD 100.1. The policy change is already in effect — if you haven't updated these references yet, do so immediately. |
| 2 | Audit your documentation templates for medical necessity alignment. Your clinical staff's obesity treatment notes must satisfy NCD 100.1 criteria — not the retired section 40.5 language. Pull a sample of recent obesity-related claims and check whether documentation would hold up against NCD 100.1. |
| 3 | Check your MAC's local coverage determination. National NCD 38 and NCD 100.1 set the floor. Your Medicare Administrative Contractor may have an LCD that narrows coverage further or adds prior authorization requirements. Contact your MAC or search the CMS LCD database to confirm regional rules. |
| 4 | Verify incident-to billing compliance. NCD 38 lists "incident to a physician's professional service" as a covered benefit category. If your practice bills obesity treatment services incident to a physician, confirm that your supervision documentation meets current requirements. A gap here is a fast path to claim denial. |
| 5 | Review claims involving NCD 100.8 and NCD 100.11. CMS cross-references both of these within updated NCD 38. If your patients receive obesity treatment alongside services covered by those NCDs, confirm that your billing reflects the correct NCD basis for each service. Billing under the wrong NCD reference creates audit exposure. |
| 6 | Loop in your compliance officer if you bill high volumes of obesity treatment. This structural change — moving section 40.5 from NCD 38 to NCD 100.1 — is the kind of shift that looks minor on paper but creates real audit risk if your team keeps working off old references. If obesity treatment is a significant revenue line for your practice, have your compliance officer review your documentation protocols against NCD 100.1. |
| Previous Version | Current Version |
|---|---|
| Coverage is considered experimental and investigational for all indications | Coverage is considered medically necessary when specific criteria are met |
| Prior authorization is not required | Prior authorization is required for initial treatment |
| Documentation must include clinical history | Documentation must include clinical history |
| Re-review every 24 months | Re-review every 12 months with updated clinical documentation |
CPT, HCPCS, and ICD-10 Codes for Obesity Treatment Under NCD 38
NCD 38 as modified does not list specific CPT or HCPCS codes within the policy document itself. This is consistent with how CMS structured this NCD — the code-level detail lives in the cross-referenced NCDs.
No codes are enumerated directly within NCD 38. Your billing team should pull codes from the following sources:
| Cross-Referenced NCD | Topic | Where to Find Codes |
|---|---|---|
| NCD 100.1 | Intensive Behavioral Therapy for Obesity | CMS NCD 100.1 |
| NCD 100.8 | See NCD 100.8 for topic and codes | CMS NCD 100.8 |
| NCD 100.11 | See NCD 100.11 for topic and codes | CMS NCD 100.11 |
Do not fabricate codes from the NCD 38 document. The policy data does not include them. Go to the source NCDs for the actual billable codes and their coverage criteria.
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