The CPAP Mask Is Not the Problem. The Refill Request You Never Documented Is.
Medicare's CPAP improper payment rate sits at 24.1%, and a missing refill request shows up again and again in the error data. Here's what A7030–A7039 claims need before the box ships.
Resupply is the quiet leak: Auto-ship programs, patient texts and "just send the usual" calls all feel routine. To a CERT reviewer, a CPAP supply claim with no refill request on file looks like a claim that shouldn't have been paid.
A claim that looked perfect on the day it shipped
Picture a Tuesday in your resupply queue. A patient finished the 90-day compliance window a year ago, and the original order is on file. The system flags a full face mask, a cushion, tubing and two filters as due, and a coordinator ships them. Nothing unusual. Eight months later, a records request lands, and the question is simple: where is the patient's request for these items?
There's a call log note that says "pt confirmed." It has no date for the contact, and no mention of what supplies were left. The reviewer doesn't argue about whether the patient needed a mask. They look at the refill request, find it inadequate, and deny the line.
Those 67 claims weren't denied because the equipment was wrong. Documentation to support coverage criteria was the biggest category, but the refill request failures sat right behind it, ahead of missing orders. They're also the most fixable kind of error, because nobody has to be re-examined and no new test has to be run. The failure is a process gap at the moment of shipment.
"You can't reconstruct a refill request eight months later. Either the patient asked, and you wrote it down, or you didn't."
What a compliant refill request looks like
The DMEPOS refill rules are short, and most suppliers know the gist. The trouble is the detail, since auditors read every word.
A refill request has to come from the patient or their caregiver, not from your computer. If your team makes outreach calls, the contact generally can't go out earlier than about 14 days before the expected delivery date, and shipment can't go out earlier than about 10 days before the patient would run out. Your records need to show what's on hand, what's being requested, and when. Auto-ship with no patient response doesn't meet the standard, no matter how reliable the cadence.
The replacement schedule most denials hide behind
The second trap is quantity. Under the PAP supplies LCD (L33718) and its policy article, each supply has a usual maximum frequency. Billing the same item sooner invites a denial unless the chart shows why. Here are the commonly billed items. Always confirm against the current LCD before you build rules around them.
| HCPCS | Item | Usual maximum | Where it goes wrong | Risk |
|---|---|---|---|---|
| A7030 | Full face mask | 1 per 3 months | Shipped with a cushion that was already due | High |
| A7031 | Full face mask cushion | 1 per month | Bundled early with every mask order | High |
| A7034 | Nasal interface | 1 per 3 months | Replaced after a refit, no note why | Moderate |
| A7035 | Headgear | 1 per 6 months | Added to every mask shipment | Moderate |
| A7037 | Tubing | 1 per 3 months | Heated tubing billed with the wrong code | Moderate |
| A7038 / A7039 | Disposable / non-disposable filter | 2 per month / 1 per 6 months | Both billed in the same period | High |
Even Medicare's own watchdog has questioned whether this schedule is too generous. The HHS Office of Inspector General found in 2013 that many other payers replace these items less often, and that clinicians say a well-fitted mask needs replacing less than Medicare allows. CMS didn't agree, and the schedule stands. So for now, the schedule is the rule, and every claim above it needs a reason in the chart.
"Auditors don't grade you on whether the patient probably needed it. They grade you on whether the file proves it."
Where the timeline breaks
The checklist to run before the box leaves
Why good teams still miss this
Resupply is high-volume and low-drama. Nobody budgets forty minutes to read a call note when sixty shipments are queued. The refill request sits in a phone system, a text thread, or a portal, while the claim lives in billing, so the two never meet until an auditor asks them to.
That isn't a training problem. It's a visibility problem. The gap is only obvious if someone checks the request against the claim before the claim goes out, and by then the line is usually already paid and exposed.
What to do this week
1. Sample 25 recent resupply claims
Pull the chart for each and look for a dated request, listed items and quantities that fit the schedule. If five or more fail, treat it as a process issue.
2. Fix the note template
Give every outreach call the same short script and fields: date, who called, items requested, supplies on hand. It takes a minute and it's the thing that survives an audit.
3. Add a hard stop at shipment
No request on file means no label printed. It feels strict for about two weeks, then it feels normal.
Catch the refill gap before it becomes a takeback
DocuFindr checks resupply documentation against payer and LCD rules before the claim leaves your desk. Bring us 25 charts and we'll show you what an auditor would see.