TL;DR: The Centers for Medicare & Medicaid Services modified NCD 64, its breast reconstruction following mastectomy coverage policy, with an effective date of January 9, 2026. Here's what billing teams need to know.
This update to the CMS breast reconstruction coverage policy confirms Medicare coverage for reconstruction of both the affected breast and the contralateral unaffected breast after a medically necessary mastectomy. The policy document does not list specific CPT or HCPCS codes — which creates real documentation and coding challenges your billing team needs to address now. If you handle breast reconstruction billing for Medicare patients, this policy governs your reimbursement.
Quick-Reference Table
| Field | Detail |
|---|---|
| Payer | CMS (Centers for Medicare & Medicaid Services) |
| Policy | Breast Reconstruction Following Mastectomy |
| Policy Code | NCD 64 |
| Change Type | Modified |
| Effective Date | January 9, 2026 |
| Impact Level | Medium |
| Specialties Affected | Plastic surgery, general surgery, oncologic surgery, breast surgery programs |
| Key Action | Audit your mastectomy and reconstruction claims for medical necessity documentation before billing under this updated policy |
CMS Breast Reconstruction Coverage Criteria and Medical Necessity Requirements 2026
NCD 64 is the National Coverage Determination governing Medicare coverage of breast reconstruction following mastectomy. The Centers for Medicare & Medicaid Services updated this policy on January 9, 2026.
The core rule is straightforward: Medicare covers breast reconstruction surgery following removal of a breast for any medical reason. That broad language is intentional. It doesn't restrict coverage to cancer. Any medically necessary mastectomy — including those performed for fibrocystic disease or other conditions — qualifies as the triggering event for covered reconstruction.
The coverage extends to both sides. CMS explicitly covers reconstruction of the affected breast and the contralateral unaffected breast. This matters for billing teams because you have a clear policy basis for claims on the unaffected side — a point that's often challenged at the claim level.
Medical necessity attaches to the mastectomy, not the reconstruction. The reconstruction is considered a relatively safe and effective noncosmetic procedure when it follows a medically necessary mastectomy. Your documentation should establish the medical necessity of the underlying mastectomy first. The reconstruction coverage follows from that.
This coverage policy applies to the Physicians' Services benefit category under Medicare. That's the billing framework your team works within for these claims.
What About Prior Authorization?
NCD 64 does not specify a federal prior authorization requirement for breast reconstruction following mastectomy. However, your Medicare Administrative Contractor may have additional local coverage determination requirements that apply in your region. Check with your MAC before assuming prior auth is not required for any specific case. If you're billing a complex reconstruction or an unusual clinical scenario, loop in your compliance officer before the claim goes out.
Cosmetic vs. Reconstructive: The Line That Drives Claim Denial
The coverage policy draws one hard line: reconstruction for cosmetic reasons is not covered. CMS cites the statutory exclusion under §1862(a)(10) of the Social Security Act. Cosmetic surgery is excluded from Medicare coverage, full stop.
The practical risk for your billing team is misclassification. A claim for breast reconstruction that looks cosmetic — without documentation tying it to a prior medically necessary mastectomy — will deny. The medical record needs to show the mastectomy, the medical indication for it, and the reconstructive intent of the follow-up procedure.
This is the central documentation challenge under NCD 64, and it hasn't changed with this update. What has changed is that the policy has been formally reviewed and modified. That's a signal to audit your current documentation workflows now.
CMS Breast Reconstruction Exclusions and Non-Covered Indications
The exclusion under NCD 64 is narrow but firm: Medicare does not cover breast reconstruction performed for cosmetic reasons.
The statute behind this exclusion is §1862(a)(10) of the Social Security Act. CMS is not exercising discretion here — the exclusion is statutory. No amount of medical documentation turns a purely cosmetic procedure into a covered one.
The practical distinction comes down to whether a medically necessary mastectomy preceded the reconstruction. If it did, the reconstruction is covered. If the patient is seeking breast reconstruction without that prior event — or if the documentation doesn't establish the connection — the claim falls into the cosmetic exclusion.
Your billing team should treat this as a documentation issue, not a clinical one. The surgeons know the difference. The risk is that the claim doesn't reflect that difference clearly enough to survive a payer audit.
Coverage Indications at a Glance
| Indication | Status | Relevant Codes | Notes |
|---|---|---|---|
| Reconstruction of the affected breast following medically necessary mastectomy | Covered | Not specified in NCD 64 | Documentation must establish medical necessity of mastectomy |
| Reconstruction of the contralateral unaffected breast following medically necessary mastectomy | Covered | Not specified in NCD 64 | Both sides covered when tied to qualifying mastectomy |
| Breast reconstruction following mastectomy for fibrocystic disease | Covered | Not specified in NCD 64 | "Any medical reason" language is explicit |
| Breast reconstruction following mastectomy for breast cancer | Covered | Not specified in NCD 64 | Primary indication; coverage is well established |
| Breast reconstruction for cosmetic reasons | Not Covered | Not specified in NCD 64 | Statutory exclusion under §1862(a)(10); no exceptions |
CMS Breast Reconstruction Billing Guidelines and Action Items 2026
The January 9, 2026 effective date means this updated policy is already in force. Here's what your billing team should do now.
| # | Action Item |
|---|---|
| 1 | Audit your documentation templates for mastectomy and reconstruction cases. The policy's coverage hinges entirely on establishing that the mastectomy was medically necessary. If your operative notes and physician documentation don't clearly state the medical indication for the mastectomy, fix that before the next claim goes out. This is your single biggest claim denial risk under NCD 64. |
| 2 | Confirm your MAC's local coverage determination requirements. NCD 64 is a national policy, but your Medicare Administrative Contractor may have issued a local coverage determination with additional criteria or documentation requirements. Pull your MAC's LCD for breast reconstruction and compare it against NCD 64. Where the LCD is more restrictive, the LCD governs your billing. |
| 3 | Train your coders on the cosmetic vs. reconstructive distinction. This policy does not list specific CPT codes, which means your coders must apply their own code selection. The documented intent of the procedure — reconstructive following a medically necessary mastectomy — must be clearly supported in the medical record before a reconstruction code is assigned. Ambiguous documentation leads to claim denial. |
| 4 | Document the contralateral breast indication explicitly. CMS covers reconstruction of the unaffected breast when it follows a medically necessary mastectomy. That coverage is real and billable. But the claim needs to show the clinical rationale for the contralateral procedure as part of the reconstruction plan. If your templates don't capture this, update them. |
| 5 | Review any pending claims for reconstruction procedures tied to mastectomies performed before January 9, 2026. The policy modification date doesn't necessarily change coverage criteria in a way that would affect older claims, but any claim currently under review or pending appeal should be evaluated against the current NCD 64 language. |
| 6 | Talk to your compliance officer if you have cases that sit near the cosmetic/reconstructive line. NCD 64's exclusion is statutory, not discretionary. If you're uncertain whether a specific case meets the covered criteria, get a compliance review before billing. A denied claim is recoverable. A claim flagged for false billing is not. |
| 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 Breast Reconstruction Under NCD 64
NCD 64 does not list specific CPT, HCPCS, or ICD-10 codes. This is not unusual for older national coverage determinations — CMS sometimes issues policy-level coverage rules without enumerating the procedure codes that fall under them.
This creates a real challenge for breast reconstruction billing teams. You cannot look up a code in the policy and confirm coverage. Instead, you must confirm that the procedure your team is coding:
- Follows a medically necessary mastectomy
- Is reconstructive in intent, not cosmetic
- Is supported by documentation that makes that intent clear
For code selection guidance, your best resources are your MAC's local coverage determination, the AMA's CPT codebook for reconstruction procedures, and your facility's coding compliance team. If your MAC has published an LCD with specific codes for breast reconstruction, those codes and their coverage criteria supersede this NCD at the local level.
Do not bill codes based on this NCD alone. Use the NCD to confirm coverage intent, then apply your MAC's code-level guidance for actual claim submission.
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