She Lost One Breast to Cancer at 68. Medicare Could Cover Surgery on Both and Pay 80% of Her Surgeon’s Approved Bill.

Picture a 68-year-old woman on Original Medicare who has had her left breast removed because of cancer. As she plans reconstruction, she expects Medicare to help pay for rebuilding that side. Her healthy right breast seems like a different matter. She assumes surgery to make the two match would be cosmetic, leaving her to cover that bill herself. She’s hypothetical, but the coverage question is real.

She has the second part wrong. Medicare’s national coverage rule includes reconstruction on the healthy breast after a medically necessary mastectomy. Surgery to help the two sides match can qualify for coverage, leaving her responsible for the usual cost sharing instead of the entire bill.

Medicare’s Rule Reaches the Healthy Breast

This protection has been explicit since January 1, 1997. The Centers for Medicare & Medicaid Services (CMS) includes both breasts in its national coverage determination, or NCD 140.2. It applies after a mastectomy for any medical reason, not just cancer.

The rule calls the opposite breast “contralateral.” For a woman who had only one breast removed, that means the healthy side can be reshaped to match as part of her covered reconstruction.

What Separates Paying Everything From Paying Your Share

For covered reconstruction, her share depends on where the surgery happens and whether she has supplemental coverage. Under Original Medicare, the 2026 costs break down this way:

• Outpatient surgery: After the $283 annual Part B deductible, she generally owes 20% of the Medicare-approved amount for doctors who accept that amount as full payment. The facility bills separately. A hospital outpatient department generally charges a copayment; an ambulatory surgery center generally charges 20% of its approved amount.
• Inpatient surgery: Part A covers the hospital stay, with a $1,736 deductible per benefit period. Her surgeon and other doctors bill Part B separately, so meeting the hospital deductible doesn’t settle their bills.

Reconstruction can happen at the time of mastectomy or later. The CMS language links coverage to the mastectomy itself and sets no deadline. A woman who completes chemotherapy and radiation before her surgeon balances the healthy side still is eligible, provided her records show that connection.

Where Medicare Draws the Cosmetic Line

Medicare won’t pay for unrelated changes made solely for appearance. But matching the healthy breast to the reconstructed one can be part of covered care. So can other medically necessary work, such as treating a reconstruction complication.

Her records should explain what each procedure is meant to accomplish and how it relates to her mastectomy. The claim doesn’t need to suggest she still has active cancer if she doesn’t. It needs an accurate diagnosis and documentation supporting the reconstruction.

Medicare Advantage members face one more hurdle. Their plans run their own networks and can require prior authorization before staged surgeries. The open enrollment period is underway. If her reconstruction will continue into next year, she should confirm her plastic surgeon stays in the plan’s 2027 network before she renews.

Many women have heard of the Women’s Health and Cancer Rights Act, but that law covers group health plans and individual insurance. For Medicare beneficiaries, CMS determination 140.2 is the rule that applies.

Three Calls to Make Before Booking Surgery

1. Ask the surgeon’s billing office how it will code and bill every stage. Specifically, confirm that the healthy-breast procedure will carry the mastectomy-related diagnosis and be billed as reconstruction.
2. On Medicare Advantage, ask which procedures need prior authorization and have the surgeon submit the planned reconstruction. Get any required approvals in writing, and confirm which stages and dates they cover. Don’t assume approval for the first operation covers every later visit or surgery.
3. If a claim comes back denied as cosmetic, appeal and reference NCD 140.2 by number. Quote the sentence covering the “contralateral unaffected breast” and attach the operative notes that link the procedure to her mastectomy.

Her healthy breast doesn’t have to be off-limits to covered reconstruction. Before assuming she must pay the whole bill, she should ask her surgeon to document the need and get an estimate that includes both the doctors and the facility. The benefit can reach both sides. Her bill depends on the care she receives and the coverage she carries.

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