RARC M86: Payment Already Made for Same or Similar Service Within Set Time Frame
RARC M86 means the service was denied because payment was already made for the same or a similar procedure within a set time frame — a frequency-window denial, common on DME, eye exams, screenings, and preventive services. It typically rides with CO-18 or CO-119 style frequency logic.
- Type
- Informational (supplemental)
- Usually paired with
- CO-18, CO-119, frequency CARCs
- Fixable?
- Sometimes — if the prior payment or window was misapplied
- Typical fix
- Verify the prior paid service and window; appeal or write off
What does remark code M86 mean?
Official X12 text: "Service denied because payment already made for same/similar procedure within set time frame." The payer checked the patient's history, found a paid claim for the same or a comparable service inside the frequency window, and denied yours. It is history-driven: nothing on your claim was wrong except the calendar.
ERA mini-example: E0143 (folding walker) billed $110.00 denies with M86. Eligibility history shows a walker paid 26 months ago by a different supplier — inside the five-year reasonable useful lifetime. No ABN on file, so the $110.00 is the supplier's loss, not the patient's bill.
Which denial code does M86 come with?
Commonly CO-18 when the payer frames it as duplicate-adjacent, or CO-119 when a benefit maximum or frequency limit is the stated reason; CO-96 appears at some commercial payers. Its cousin N357 covers time frames between related services. Sort the exact meaning with the denial code lookup.
How do you fix an M86 denial?
- Pull the patient's claim history via the payer portal or IVR: what paid, when, and from whom.
- Compare the prior service to yours — same category, or genuinely different? Check the applicable frequency window.
- If the window was misapplied or the items differ, appeal with the specifics; if replacement was due to loss, theft, or irreparable damage, document it and use the payer's replacement process.
- If the denial is correct and no ABN exists, write it off and fix the intake gap.
How do you prevent M86?
Build frequency awareness into scheduling and dispensing: screening intervals checked at booking, DME same-or-similar checked before delivery, and preventive services verified against the benefit calendar rather than the patient's memory. Where coverage is doubtful, obtain an ABN so a correct denial becomes patient responsibility instead of a write-off. Practices that verify history up front turn M86 from a monthly write-off line into a rarity.
Frequently asked questions
More than an exact CPT match. For DME, Medicare treats equipment in the same functional category as similar — a patient with a paid walker claim will draw M86 on a new walker or comparable mobility device before the reasonable useful lifetime (typically 5 years) expires. For screenings, the check runs against the benefit interval, like annual or once per 10 years.
The frequency window follows the patient, not the provider. If another supplier billed similar equipment last year, your claim denies even though you never saw a dime. This is why checking eligibility and same-or-similar history before dispensing DME is standard practice — after delivery, your leverage is an ABN you probably did not get.
Yes, when the facts support it: the prior claim was for genuinely different equipment or service, the prior item was lost or damaged (with documentation), the window is actually expired, or medical necessity changed materially. Appeal with the prior claim details and records. If the window is real and running, the balance is a write-off unless a valid ABN shifted liability.
Sources & further reading
Reviewed by the ImmediCare Solutions RCM team
Certified billers and coders handling claims across 50+ specialties nationwide. This entry is reviewed against current payer policy and CMS rules. Last review: Jul 5, 2026.
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