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M5 Remark Code: DME Rental Month Limit Reached

M5 means the payer limits monthly rental payments for this equipment. Payments can continue until the earlier of the 15th month from the first rental month or the month the patient no longer needs the item.

Quick facts

Code
M5 (RARC M5)
Status
Active In use since January 1, 1997.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): Rental months billed past the limit are a supplier write-off and generally cannot be billed to the patient.
  • OA (Other Adjustment): Some payers report the limit as an informational adjustment when no liability shifts to either party.
Official description
Monthly rental payments can continue until the earlier of the 15th month from the first rental month, or the month when the equipment is no longer needed.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What M5 means

M5 attaches to a DME rental line to explain a limit on how long monthly rental payments continue. According to the official text, payments run until whichever comes first: the 15th month from the first rental month, or the month the equipment is no longer medically needed. When you bill a month beyond that point, the payer denies or zeroes out the line and uses M5 to say why.

The wording dates back to the original Medicare capped rental rules. Payers’ current limits can differ by equipment category, so treat M5 as “you have hit the rental ceiling for this item” and then verify the specific rule.

Common causes

  • Monthly rental claims continued after the payer’s rental cap was reached.
  • The first rental month on file is earlier than the supplier’s records, often because another supplier started the rental.
  • The patient’s need ended, but claims kept going out.
  • A break in therapy was assumed without the documentation that would start a new rental period.

What to do

  1. Count the paid rental months on your remittances and compare with the payer’s first rental month.
  2. Check for a prior supplier. If another supplier began the rental, the count may already be further along than you thought.
  3. If your count is correct and the payer’s is wrong, contact the payer with remittance history and request reprocessing.
  4. If a legitimate break in need occurred, submit the documentation the payer requires to establish a new rental period.
  5. Stop recurring claims for the item once the cap is confirmed.

How to prevent it

Track rental month counts per patient and per item in your billing system, and check prior rental history before accepting a transferred patient. For more on reading remark codes alongside reason codes, see CARC and RARC denial analysis.

Codes that may appear with M5

  • PR-119 (Benefit maximum for this time period or occurrence has been reached.): The benefit maximum for the rental period has been reached.
  • CO-35 (Lifetime benefit maximum has been reached.): The lifetime or rental benefit maximum for this item has been reached.
  • CO-96 (Non-covered charge(s).): The month billed is non-covered because it falls past the rental limit.
  • M7 (No rental payments after the item is purchased, returned or after the total of issued rental payments equals the purchase price.): No rental after the item is purchased, returned, or fully paid through rental installments.
  • N370 (Billing exceeds the rental months covered/approved by the payer.): Billing exceeds the rental months covered or approved by the payer.
  • M93 (Information supplied supports a break in therapy.): A break in therapy was supported, so a new capped rental period started.

M5 FAQ

Why does M5 mention the 15th month when Medicare caps most rentals sooner?

The remark text reflects an older capped rental framework. Current rental limits depend on the item's payment category and the payer's rules, so check the policy that applies to your date of service.

Can I restart rental billing?

Only if the payer recognizes a new rental period, for example after a documented break in need or a qualifying change. Otherwise further months are not paid.

Who is responsible for the equipment after the limit?

That depends on the item type and payer. The supplier may still have maintenance obligations even when rental payments stop.