# Why Do Breast Prosthesis Claims Keep Getting Denied by Medicare?

> Medicare flagged a 25 percent improper payment rate on breast prosthesis claims and now covers code L8031. What practices should fix today.

Source: https://webillhealth.com/why-do-breast-prosthesis-claims-keep-getting-denied-by-medicare/  
Publisher: WeBill Health  
Last updated: November 7, 2026

Medicare’s November 5, 2026 MLN Connects newsletter reports a 25% improper payment rate on breast prosthesis claims, a projected 6.7 million dollars, with half of that tied to missing documentation. The same week, Medicare’s DME contractors finalized a coverage change that makes silicone prosthesis code L8031 payable for the first time.

## What Did Medicare Just Change About Breast Prosthesis Coverage?

The DME Medicare Administrative Contractors removed the “not reasonable and necessary” determination that had blocked payment for HCPCS code L8031, a silicone breast prosthesis with an integral adhesive. In a Response to Comments article published November 5, 2026, the contractors confirmed that L8031 will now be covered under the same criterion already used for other silicone external breast prostheses, for beneficiaries who have had a mastectomy. Nine commenters weighed in during the public comment period, and the contractors said the policy “will be finalized as proposed.”

This gives surgeons, oncologists, and the suppliers who fit these devices a new option to discuss with patients. It does not change the underlying coverage test: the patient still needs a mastectomy history and a treating practitioner’s documentation that supports medical necessity.

## Why Is Medicare Flagging So Many of These Claims?

Because the error rate is high and the cause is avoidable. Of the improper payments CMS identified for 2024, insufficient documentation accounted for 50%, other errors such as duplicate billing or noncovered services made up 35.6%, and medical necessity failures made up 14.4%. That breakdown points squarely at paperwork, not patient eligibility.

CMS lists the codes most exposed to this error rate: L8000 and L8001 for mastectomy bras, L8015 for the garment form, L8020 for the mastectomy form, and L8030 and now L8031 for silicone prostheses. L8035, the custom fabricated prosthesis, remains nationally noncovered.

## What Documentation Actually Prevents a Denial?

Four elements, applied consistently, cover most of it. The order needs the correct HCPCS code on a standard written order form, and the treating practitioner’s note needs to state whether the patient needs a unilateral or bilateral form. The supplier needs proof of delivery on file. For items on Medicare’s Final Rule 1713 list, the written order also has to arrive before the item is delivered, because a written order that shows up after delivery does not cure the claim.

Billing mechanics matter too. For bilateral items with dates of service on or after March 1, 2019, each side bills on its own line with the RT or LT modifier and one unit each. A single line billed RTLT with two units is rejected outright. Codes L8000, L8001, L8002, and L8015 are exempt from that rule, and every claim needs a supporting ICD 10 diagnosis code such as a mastectomy history or acquired absence of the breast.

## Does This Fall on the Surgeon, the Supplier, or Both?

Both, and that split is exactly where claims fall through. The DME supplier files the claim, but the order and the medical necessity documentation come from the treating practitioner’s office. If a surgeon’s chart does not clearly state why a patient needs a given prosthesis type, no supplier paperwork fixes that at the claim level, and the denial lands on whoever submitted it. A clinic that refers patients to an outside prosthetics supplier is still the source of the record that determines whether the claim pays.

## What This Means for Practices With 1 to 15 Providers

A small surgical, oncology, or OB/GYN practice that orders breast prostheses for even a handful of patients a month carries real exposure here. Concrete steps:

* Pull every breast prosthesis order written in the last 90 days and check each one for a stated unilateral or bilateral need, a supporting ICD 10 code, and a written order dated before delivery.
* Confirm your billing staff or supplier partner is billing bilateral claims on two lines with RT and LT, never one line with RTLT and two units.
* Tell your surgeons and front desk that L8031 is now a coverable option, so patient conversations and order templates can include it without a separate appeal fight later.
* Build the four documentation elements above into your order template now, before your next postmastectomy patient, so the chart never has to be reconstructed after a denial arrives.

## How WeBill Health Approaches Claims Like These

WeBill Health maintains internal payer rule libraries organized by specialty and by carrier, across more than 500 payer rulesets, built and updated by people who work claims in your specialty every day. Every claim receives human pre submission review against those libraries before it goes out. When a Medicare contractor changes a coverage determination the way it just did for L8031, a person updates the library and a person applies it to your claims, so the order, the modifier, and the diagnosis code are checked before the claim ever reaches the payer.

## FAQ

**What is HCPCS code L8031 and why does it matter now?** 

L8031 describes a silicone breast prosthesis with an integral adhesive. As of November 5, 2026, Medicare’s DME contractors cover it under the same criterion used for other silicone external breast prostheses for beneficiaries who have had a mastectomy.

**Who is responsible when a breast prosthesis claim gets denied?** 

Whoever submits the claim bears the denial, but the underlying problem is usually the ordering practitioner’s documentation. The surgeon’s or oncologist’s note has to state the medical need clearly enough for the supplier’s claim to stand on it.

**How long does Medicare expect a breast prosthesis to last?** 

CMS sets a useful lifetime of two years for silicone breast prostheses, three months for nipple prostheses, and six months for fabric, foam, or fiber filled prostheses. Replacement sooner for ordinary wear and tear is denied.

**Where can my practice check the current rules?** 

The DME MAC Local Coverage Determination L33317 and its Policy Article A52478 carry the current coding, documentation, and modifier rules, and both are updated as CMS finalizes changes like this one.

If you want a practice specific look at where your own claims are exposed to documentation gaps like these, WeBill Health’s [Revenue Defense Audit](https://webillhealth.com/revenue-defense-audit/) reviews your denial patterns, coding alignment, and documentation against exactly this kind of payer rule change.

### Sources

* [CMS, MLN Connects Newsletter, November 5, 2026](https://www.cms.gov/training-education/medicare-learning-network/newsletter/mln-connects-newsletter-november-5-2026)
* [CMS, Medicare Provider Compliance Tips: Breast Prostheses](https://www.cms.gov/training-education/medicare-learning-networkr-mln/compliance/medicare-provider-compliance-tips/breast-prostheses)
* [CMS Medicare Coverage Database, Response to Comments: External Breast Prostheses (DL33317), Article A60574, effective November 5, 2026](https://www.cms.gov/medicare-coverage-database/view/article.aspx?articleid=60574&ver=5)
* [CMS Medicare Coverage Database, External Breast Prostheses Policy Article A52478](https://www.cms.gov/medicare-coverage-database/view/article.aspx?articleid=52478&ver=29)

WeBill Health is a specialty focused revenue cycle management partner for independent practices. Request a Revenue Defense Audit at https://webillhealth.com/form/