Every skilled nursing facility has a story about a claim that bounced because somebody else billed first. Usually the cause is consolidated billing, and small facilities get hit hardest because nobody in the building owns it.

The rule is easy to state. While a resident is in a covered Medicare Part A stay, the facility is responsible for billing Medicare for nearly everything that resident receives, including therapy, supplies, labs, and a long list of outside services. Medicare pays one bundled rate under PDPM and expects the facility to pay the vendors out of it. A short list of exclusions exists, certain physician services among them, and those can be billed separately by the provider.

Things go wrong when an outside provider doesn't know the resident is in a Part A stay. A mobile imaging company or a lab bills Medicare directly, the claim hits a consolidated billing edit and gets rejected, and the vendor turns around and invoices the facility. Weeks later an invoice lands in accounts payable for a service nobody priced against the daily rate.

Most of the fix is boring. Put the Part A flag where vendors will see it: the order form, the transport sheet, the face sheet that travels with a resident to an outside appointment. Tell the vendors you use regularly how to check a resident's status before they bill. A phone call at intake costs less than a three-week dispute.

Then change how outside invoices get approved. Anything dated inside a covered stay should go to whoever tracks Part A days before it is paid or disputed. An invoice dated after the Part A days ran out is probably an ordinary Part B charge, and the vendor is right to send it. Facilities lose goodwill by fighting bills that were excludable all along, so check the exclusion list before you push back.

The less obvious piece is what this does to margin. Under a bundled rate, every outside service inside a covered stay comes out of the same pot. If you only watch ancillary spend as a monthly total, a resident with three imaging trips and a specialty wound supply order disappears into the average. Pulling ancillary cost per Part A day by resident, even once a quarter, shows which admissions run well over the daily rate.

In most small facilities the biller sees the Part A claim go out clean and the AP clerk sees a stray invoice. Neither sees the pattern. If you are weighing medical billing outsourcing for long-term care, ask whether the partner's review stops at the claim or reaches the vendor invoices tied to the same stay. The answer tells you how much of your revenue cycle they actually look at.

Author bio: Written by the LTCPro team. LTCPro is a US-based back-office partner for skilled nursing and assisted living facilities, covering billing, revenue cycle management, prior authorization, payroll, accounts payable, and general ledger work.