"Same or Similar" Denials:
The DME Claim That Was Dead Before You Shipped

The denial that has nothing to do with your paperwork

Most DME denials trace back to something in the file. A CMN missing a signature. A DWO that says "as needed" instead of a quantity. An expired prior auth. Frustrating — but at least the cause was in your building, and your team could have caught it.

Same-or-similar denials are different. The cause isn't in your file at all. It's in Medicare's claims history, and it might belong to a supplier your patient hasn't dealt with in years.

Here's the rule. Medicare assigns most DME a reasonable useful lifetime — RUL — of five years. If a beneficiary already received equipment that Medicare considers the same as, or similar to, what you're about to bill, and that equipment is still inside its RUL, your claim denies. Usually as a CO-151 with remark code M3: equipment is the same or similar to equipment already being used.

It doesn't matter that your documentation is flawless. It doesn't matter that the patient came to you because they were unhappy with the other supplier, or moved states, or that the hospital handed them a walker at discharge that's now in a closet. Medicare's history says similar equipment exists. The claim is dead on arrival.

"Your intake team can build a perfect packet for a claim that was unpayable before the referral ever hit the fax machine."

"Similar" is broader than your team thinks

The trap in this rule is the word similar. It doesn't mean the identical HCPCS code. Medicare groups equipment by function, and the groupings are wider than intuition suggests. A power wheelchair and a scooter? Similar. A semi-electric hospital bed and a full-electric one? Similar. A standard walker and the rollator your patient's physician just prescribed? In most cases — similar.

These are the categories where suppliers get burned most often:

Notice what these scenarios have in common: the patient usually isn't hiding anything. They forgot about the discharge walker. They didn't think the scooter from 2022 mattered. They assumed switching suppliers reset the clock. Your intake coordinator asked, the patient answered in good faith, and the answer was wrong — because the only accurate source is Medicare's own record, not the patient's memory.

What a same-or-similar write-off actually costs

Run the sequence. The referral arrives, intake builds the file, the equipment ships, the claim goes out. Thirty days later, CO-151/M3. There's no ABN on file, so you can't bill the patient. Appeal? Unless one of the documented exceptions applies, redeterminations on same-or-similar denials overwhelmingly uphold the denial — the history is the history.

And unlike a documentation denial, there's no partial recovery here. You don't get the equipment back in sellable condition. You spent the delivery run, the intake hours, and the billing cycle on a claim that a two-minute lookup would have flagged on day zero. For a supplier doing meaningful volume in mobility, beds, or PAP, a handful of these a month quietly adds up to five figures a quarter.

The three exceptions that actually work

A same-or-similar history doesn't always end the story. Medicare recognizes specific exceptions — but every one of them lives or dies on documentation gathered before you bill, not after the denial.

1. Lost, stolen, or irreparably damaged

If the original equipment was lost in a fire, stolen, or damaged beyond repair in a specific incident, Medicare can pay for a replacement inside the RUL. You'll need a statement describing the incident — and for theft or disaster, supporting records like a police or insurance report. "It wore out" doesn't qualify; general wear is what repairs are for.

2. A change in medical condition

If the patient's condition changed such that the current equipment no longer meets their needs — the manual chair user who can no longer self-propel, the CPAP patient with documented treatment failure who needs BiPAP — a new claim can pay. But the medical record has to actually document the change and connect it to the new equipment. A new prescription alone won't do it.

3. The RUL has expired

Five years from the delivery date of the original equipment, replacement is payable with a new physician order and a face-to-face where required. The catch: you need the actual delivery date from Medicare's records to do the math. Guessing from what the patient remembers is how suppliers ship four months early and eat the claim.

When in doubt: check first, ABN second

The same-or-similar check runs against Medicare's beneficiary records through your DME MAC's portal or IVR — Noridian's portal, myCGS, or an eligibility vendor pulling the same history. It returns the HCPCS codes on file, the supplier, and the delivery dates. Everything you need to know whether your claim will pay, before the truck leaves.

If the history is ambiguous, or an exception applies but feels thin, get an Advance Beneficiary Notice signed before delivery. A properly executed ABN shifts liability: if Medicare denies, the patient pays, and they made that choice with eyes open. No ABN means no invoice — to anyone.

Why this check keeps getting skipped

Nobody disputes that the check should happen. Ask any DME billing manager and they'll tell you it's standard practice — on paper. Then look at the intake desk on a Tuesday: eighty files, three coordinators, referral sources calling about status, and a portal lookup that requires logging into a separate system, running the search, interpreting HCPCS groupings, and doing date math against a five-year window. Per patient. Every time.

So it gets skipped on the orders that "feel" clean — the straightforward walker referral, the routine bed setup. Which are precisely the categories where discharge equipment and forgotten prior suppliers live.

"The check isn't hard. It's the eightieth file of the day, and it's the step with no fax chasing it, no referral source calling about it, and no deadline — until the denial arrives."

This is a systems problem, not a diligence problem. The same-or-similar lookup belongs inside the intake workflow itself — run automatically when the order lands, flagged before a coordinator invests an hour in a file that can't pay, with the RUL math and the equipment groupings handled by software instead of memory. That's the difference between a rule your team knows and a rule your revenue is actually protected from.

Every same-or-similar denial in your last quarter's remittances was visible in Medicare's records on the day the referral arrived. The information was sitting there. The only question is whether your workflow looked.