Medicare Part B Supply Billing for Skilled Nursing Facilities: A Complete Guide
The short answer
- Medicare Part B supply billing applies to residents who are not in a covered Part A stay. During a covered Part A stay, consolidated billing bundles most supplies into the facility's Part A payment.
- Qualifying categories generally include surgical dressings, ostomy supplies, urological supplies, tracheostomy supplies, and prosthetic and orthotic devices, subject to the applicable Local Coverage Determinations.
- Claims are submitted to the A/B MAC (A) on a UB-04 under the facility's institutional NPI. Durable Medical Equipment is a separate pathway and requires DME MAC enrollment.
- Every claim needs a standard written order, a contemporaneous clinical record supporting medical necessity under the LCD, proof of delivery, and, for recurring items, refill confirmation.
- The most common revenue gap is a resident transitioning off Part A while billable supply use continues and nobody re-evaluates the billing pathway.
Last updated August 2026
What Medicare Part B supply billing means in an SNF
Part A pays the skilled nursing facility a bundled per-diem for a covered stay. Part B pays separately, item by item, for medically necessary supplies furnished to residents outside of a covered Part A stay. Both benefits can be active inside the same building on the same day for different residents, which is why the billing pathway has to be evaluated per resident and per date of service rather than per facility.
Which supplies typically qualify
The categories most commonly billable by an SNF under its institutional NPI are surgical dressings, ostomy supplies, urological supplies, tracheostomy supplies, and prosthetic and orthotic devices. Each category has its own Local Coverage Determination and policy article setting out the clinical criteria, quantity limits, and documentation Medicare expects. Durable Medical Equipment such as wheelchairs, hospital beds, and oxygen equipment sits outside this pathway and requires separate DME supplier enrollment.
Facility NPI billing versus supplier billing
There are two ways an eligible supply can reach Medicare. In the supplier model, an external supplier bills Medicare Part B under its own NPI and keeps the reimbursement. In the facility model, the SNF bills under its own institutional NPI against its own clinical record, and the reimbursement returns to the facility. The clinical documentation supporting medical necessity already lives in the facility chart in both cases, which is the practical argument for facility-side billing.
Documentation and payer rules
A compliant Part B supply claim generally requires a standard written order signed by the treating practitioner before delivery, a contemporaneous medical record showing the item meets the reasonable and necessary criteria in the applicable LCD, proof that the item reached the resident, and documented confirmation of continued need before recurring items ship. Records are retained for seven years. Correct HCPCS selection and unit calculation matter as much as the clinical narrative, because unit errors are a frequent source of takebacks.
Where facilities lose eligible reimbursement
Three patterns account for most missed revenue: residents who roll off Part A without a billing-pathway review, supply utilization captured in the clinical chart but never translated into a claim, and eligible items handed to an external supplier by default because that is how the account has always been configured. None of these are coding problems. They are workflow problems that show up as unbilled but documented supply use.
How to evaluate your own facility
Start with a census view of residents not in a covered Part A stay, cross-referenced against documented supply utilization for the qualifying categories. Where documented use exists and no Part B claim was submitted, you have a measurable gap. A lookback of up to twelve months is often available depending on timely filing rules and payer specifics.
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Frequently asked questions
- It is the process by which an SNF bills Medicare Part B directly, under its own institutional NPI, for medically necessary supplies furnished to residents who are not in a covered Part A stay. Claims go to the A/B MAC (A) on a UB-04 and are supported by the facility's own clinical documentation.
- Only during a covered Part A stay. Consolidated billing applies while a resident has an active covered Part A benefit. Residents outside a covered Part A stay are not subject to it, and qualifying supplies may be billed separately under Part B.
- Generally surgical dressings, ostomy supplies, urological supplies, tracheostomy supplies, and prosthetic and orthotic devices, each subject to the applicable LCD. Durable Medical Equipment is not billable under the institutional NPI and requires separate DME MAC enrollment.
- A standard written order signed by the treating practitioner before delivery, a contemporaneous medical record establishing medical necessity under the applicable LCD, proof of delivery, and refill confirmation for recurring supplies. Documentation is retained for seven years.
- A lookback is often possible where documentation exists and timely filing rules still permit submission. Twelve months is a common practical window, but the exact limit depends on the payer and the date of service.
- Not necessarily. Billing and supply are separate functions. A facility can keep its current supply relationships and still change who submits the Part B claim, though the specific contract terms with a supplier determine what is possible.
- Billing under the facility's own NPI ties every claim to the facility's own chart, which is where the supporting documentation already lives. Risk comes from weak documentation and incorrect units, not from the billing pathway itself. This page is general information, not legal or compliance advice.
Related insights
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Read articleMedicare Billing Red Flags SNF Leaders Should Not Ignore
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Read articleHow SNF Documentation Connects Care Quality to Reimbursement
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Read articleTurn Missed Opportunities Into Real Profit.
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This guide is general educational information about Medicare Part B supply billing and does not constitute legal, compliance, or billing advice. Coverage and documentation requirements are set by CMS and the applicable Medicare Administrative Contractor and can change. Verify current requirements against primary CMS sources and the applicable Local Coverage Determinations.