Guides / ADR
ADR Additional Documentation Request — any equipment categoryMedicare ADR Letters: how to respond without losing the claim
Citations verified against the CMS Medicare Coverage Database · Reviewed September 2026
An ADR letter means a Medicare reviewer pulled your claim and wants the records behind it before paying. It isn't a denial — yet. Whether it becomes one depends almost entirely on whether you return a complete, organized packet by the deadline printed on the letter.
This guide covers what reviewers expect, the deadline mechanics, and the packet mistakes that convert routine ADRs into denials and appeals.
The requirements, with citations
The elements reviewers expect in a complete response, drawn from the DME MACs' standard documentation requirements.
The ADR letter itself, with identifiers
Return the letter (or its cover sheet) with your packet so the response routes to the right claim and reviewer — include the claim number and document control number exactly as printed.
Your MAC's ADR letter — routing identifiersStandard Written Order
A complete, signed, dated order for the billed item — the first thing every reviewer checks.
42 CFR 410.38(d)Face-to-face and clinical records
The chart notes documenting the qualifying encounter and the medical necessity for the item — including the category-specific evidence (sleep study for PAP, mobility exam for wheelchairs, positioning need for beds).
Standard Documentation Requirements — Article A55426Proof of delivery
Signed delivery documentation tying the billed item, the beneficiary, and the delivery date together — a required element reviewers routinely find missing.
Standard Documentation Requirements — Article A55426A cover letter that maps documents to requests
One page listing each item the ADR asked for and which enclosed document satisfies it. Reviewers work queues; making the match obvious is the cheapest favor you can do your claim.
Reviewer practice — not a regulatory elementWhat usually sinks these claims
- The response answers most of the letter but skips one requested item — partial responses are processed as incomplete
- Proof of delivery is missing, unsigned, or doesn't match the billed date of service
- Clinical records submitted postdate the order — showing the necessity was documented after the fact
- The packet arrives after the deadline because the practitioner's office was slow producing notes — with no interim contact with the MAC
Got an ADR sitting on your desk?
Record it on the case and AffirmDME drafts the response — document recommendations plus an editable cover letter, assembled from what's already in your case file.
Draft an ADR responseFAQ
How long do I have to respond to an ADR?
The deadline is printed on the letter — commonly 45 days for DME MAC reviews. Don't rely on a remembered number: the letter governs. Calendar it the day the letter arrives, and start collecting practitioner records immediately since they're the slowest piece.
What happens if I miss the deadline?
The claim is denied automatically for non-response, without any review of your documentation. You can pursue appeal rights afterward, but you've converted a paperwork request into a formal appeals process with its own clocks.
Can AffirmDME help with ADR responses?
Yes — record the ADR on the case and AffirmDME's AI reads the letter's requests against your case documents, recommends what to enclose, and drafts an editable cover letter. The packet assembles from the documents you select.
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This guide summarizes Medicare requirements as implemented in AffirmDME's compliance engine, with citations to the governing sources. It is not legal or billing advice; LCDs and CMS policy change — always confirm against the current policy text linked above.
More guides
- Medicare DME Documentation Requirements: the checklist every claim needs
- Medicare CPAP Documentation Requirements (E0601)
- Medicare Home Oxygen Documentation Requirements (E1390)
- Medicare BiPAP / RAD Documentation Requirements (E0470)
- Medicare Hospital Bed Documentation Requirements (E0260)
- Medicare Wheelchair & Power Mobility Prior Authorization (E1161)
- Medicare Knee Orthosis Documentation Requirements (L1833, L1832)
- Medicare TLSO Documentation Requirements (L0456, L0457, L0486)
- Medicare Air-Fluidized Bed Documentation Requirements (E0194)
- Medicare Ultralightweight Manual Wheelchair Requirements (K0005)
- Medicare Upper Limb Orthosis Requirements (L3761, L3916)
- Medicare Osteogenesis Stimulator Documentation Requirements (E0747, E0748)
- The Medicare DMEPOS Required Prior Authorization List, explained (2026)
- Probationary Prior Authorization for newly enrolled DMEPOS suppliers (Oct 15, 2026)
- The DMEPOS prior authorization exemption: how it works and how to keep it
- Which DME MAC handles your claim: Jurisdictions A, B, C, and D
- Standard Written Order (SWO) requirements for Medicare DME
- Medicare DME face-to-face encounter requirements
- Prior authorization vs ADR vs prepayment review vs TPE: what each means for a DME claim
- After a non-affirmed prior authorization: resubmit, deliver with an ABN, or wait
- Medicare DME proof of delivery requirements
- Preparing and submitting a DMEPOS prior authorization request
Unfamiliar term? The glossary defines ADR, SWO, UTN, PTAN and the rest; the PA List lookup checks any HCPCS code.