TL;DR: The Centers for Medicare & Medicaid Services modified NCD 64, the national coverage determination governing breast reconstruction following mastectomy, with an effective date of January 9, 2026. Here's what billing teams need to know.
This CMS breast reconstruction coverage policy confirms that reconstruction of both the affected breast and the contralateral unaffected breast is a covered benefit following any medically necessary mastectomy. The policy does not list specific CPT or HCPCS codes — which creates real documentation risk for billing teams who assume code-level guidance is elsewhere. If your team handles breast reconstruction billing for Medicare patients, this update is worth reviewing before you submit another claim.
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 | 2026-01-09 |
| Impact Level | Medium |
| Specialties Affected | Plastic Surgery, General Surgery, Breast Surgery, Oncology, OB/GYN |
| Key Action | Confirm all reconstruction claims tie back to a documented medically necessary mastectomy — cosmetic intent is grounds for denial |
CMS Breast Reconstruction Coverage Criteria and Medical Necessity Requirements 2026
The core rule under NCD 64 in the NCD Medicare system is straightforward: breast reconstruction following a mastectomy performed for any medical reason is covered. The Centers for Medicare & Medicaid Services treats this as a noncosmetic procedure — not elective, not investigational.
The coverage policy extends beyond the operated side. CMS explicitly covers reconstruction of the contralateral unaffected breast. That's a meaningful detail. If a patient undergoes a left mastectomy and wants reconstruction on both sides for symmetry, the right side is covered too, as long as the reconstruction relates to the medically necessary mastectomy.
The medical necessity anchor here is the mastectomy itself. The mastectomy must be medically necessary — meaning it was performed to treat or prevent disease, not for cosmetic reasons. Once that bar is cleared, reconstruction follows as a covered benefit. Your documentation needs to trace that chain clearly.
NCD 64 lists the covered benefit under Physicians' Services. That placement matters for claim routing and benefit category assignment.
Prior Authorization Under This Policy
NCD 64 does not specify prior authorization requirements at the national level. That doesn't mean you're in the clear. Your Medicare Administrative Contractor may have a local coverage determination that adds prior auth requirements or additional documentation criteria on top of this NCD. Check with your MAC before assuming this is a prior auth-free service.
Reimbursement rates are also not set within NCD 64 itself. Rates follow the Medicare Physician Fee Schedule based on the CPT codes your team submits — and since NCD 64 doesn't specify those codes, your code selection carries the full documentation and compliance burden.
CMS Breast Reconstruction Exclusions and Non-Covered Indications
There is one clear exclusion in this coverage policy: breast reconstruction for cosmetic reasons is not covered.
CMS cites §1862(a)(10) of the Social Security Act. That statute excludes cosmetic surgery from Medicare coverage. So if a claim doesn't connect to a prior medically necessary mastectomy, it won't get paid.
The real issue here is documentation, not intent. Most surgeons performing breast reconstruction are doing so post-mastectomy. But if your claim file doesn't clearly tie the reconstruction to a documented medical mastectomy, a claims reviewer has grounds for denial. That's a simple documentation problem with a simple fix — but only if your team catches it before submission, not after.
Watch for cases where the mastectomy happened years earlier at a different facility. You may need to pull outside records to establish the medical necessity chain. Don't assume the payer will make that connection on their own.
Coverage Indications at a Glance
| Indication | Status | Relevant Codes | Notes |
|---|---|---|---|
| Reconstruction of affected breast following medically necessary mastectomy | Covered | Not specified in NCD 64 | Must document mastectomy as medically necessary |
| Reconstruction of contralateral unaffected breast following medically necessary mastectomy | Covered | Not specified in NCD 64 | Covered for symmetry following covered mastectomy |
| Breast reconstruction for cosmetic reasons (no prior medically necessary mastectomy) | Not Covered | N/A | Excluded under §1862(a)(10) of the Social Security Act |
CMS Breast Reconstruction Billing Guidelines and Action Items 2026
These action items apply directly to what NCD 64 says — and what it doesn't say.
| # | Action Item |
|---|---|
| 1 | Audit your documentation workflow before January 9, 2026. Every breast reconstruction claim you submit to Medicare needs a clear, documented connection to a prior medically necessary mastectomy. Build a documentation checklist that requires this link at the time of charge capture. |
| 2 | Check with your MAC for a local coverage determination. NCD 64 sets the national floor. Your MAC may have an LCD that adds criteria, prior authorization requirements, or documentation standards on top of this NCD. Pull your MAC's current guidance now — don't wait for a claim denial to find out. |
| 3 | Flag contralateral reconstruction cases for explicit documentation. Coverage of the unaffected breast is legitimate under this policy, but it's also the type of line item that triggers audits. Your claim file should clearly explain the symmetry rationale and tie it to the covered mastectomy. Make this part of your standard billing guidelines for breast reconstruction cases. |
| 4 | Confirm your CPT code selection independently. NCD 64 does not list specific CPT or HCPCS codes. Your billing team is responsible for selecting the correct procedure codes based on what was actually performed. Work with your surgeons to confirm codes are mapped accurately. Miscoded claims are a fast path to denial and recoupment. |
| 5 | Train your intake team on the cosmetic exclusion. The line between reconstructive and cosmetic isn't always obvious at the scheduling stage. Make sure your intake and pre-auth teams know the difference — and that they're flagging any case where the mastectomy record isn't confirmed before the reconstruction claim goes out. |
| 6 | Consult your compliance officer if you handle high volumes of bilateral reconstruction. Contralateral reconstruction billing is legitimate, but high-volume billing for non-affected-side reconstruction will draw scrutiny. If bilateral cases are a significant part of your payer mix, talk to your compliance officer about documentation standards and audit readiness before the effective date. |
| 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
Codes Listed in NCD 64
The policy document for NCD 64 does not list specific CPT, HCPCS Level II, or ICD-10-CM codes. This is not uncommon for older NCDs — coverage determinations at the national level sometimes establish the coverage principle without specifying the procedure codes used to bill for the service.
That gap is your problem to solve, not CMS's. Your billing team must select the appropriate CPT codes based on the specific procedure performed. For breast reconstruction billing, commonly relevant procedure codes fall within the plastic and reconstructive surgery ranges, but your team should confirm the correct codes with your surgeons and, if needed, your MAC.
What to Do About Missing Codes
The absence of codes in NCD 64 means you won't find a shortcut here. Three practical steps:
- Review your MAC's LCD or billing articles for breast reconstruction, which may provide code-level guidance that NCD 64 lacks
- Work with your physicians to document the specific technique used (implant-based, flap-based, tissue expander, etc.) — technique drives code selection
- Use your encoder or coding resource to confirm CPT code assignments align with documentation
If your team is unsure which codes apply to a specific reconstruction type, loop in a certified coder or your billing consultant before submitting. A wrong code on a breast reconstruction claim — especially for contralateral procedures — is a claim denial waiting to happen.
What This Policy Change Actually Means for Your Team
The modification to NCD 64 doesn't flip coverage — reconstruction post-mastectomy remains covered. The value in reviewing this update is clarity: CMS is restating and reinforcing that both the affected and contralateral breast are within scope, and that the cosmetic exclusion is the only hard wall.
For most billing teams, the risk isn't misunderstanding the coverage rule. The risk is documentation gaps. A claim that should be covered gets denied because the mastectomy record wasn't pulled, or the contralateral reconstruction wasn't clearly justified in the file.
This is also a good reminder that Medicare reimbursement for breast reconstruction runs through the Physician Fee Schedule — and getting paid correctly means getting the CPT codes right, not just the coverage determination right. NCD 64 tells you what's covered. Your code selection and documentation tell CMS what you actually did.
If you're billing for breast surgery at any meaningful volume, treat this policy update as a trigger to review your documentation standards and MAC-level guidance. The NCD is the ceiling — your local coverage determination may be lower.
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