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M63 Remark Code (Deactivated): One Per Day Limit

M63 meant the payer would not pay for more than one of these services on the same day. X12 deactivated it and suggested M86, which says payment was already made for the same or a similar procedure within a set time frame.

X12 deactivated RARCM63 on January 31, 2004. Payers should no longer use it on new remittances, but it can still appear on older ERAs, corrected claims, and appeals.

Code: M63 (RARC M63)
Status: Deactivated StoppedJanuary 31, 2004 (in use since January 1, 1997).
Code set: Remittance Advice Remark Codes (RARC)
Group codes: CO (Contractual Obligation): Accompanied CO frequency or bundling denials; the extra service was a provider write-off.
Official description: We do not pay for more than one of these on the same day.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified: September 24, 2026 against the official X12 list.

What M63 meant

Remark M63 explained a frequency limit of one per day. If the same service appeared twice for the same patient and date, the payer paid the first and denied the second, using this remark to explain why.

What replaced it

X12’s note suggested M86. M86 is active and covers services denied because the same or a similar procedure was already paid within a set time frame, which includes same-day repeats. The adjustment code alongside may be CO-B14 for visits, or CO-151 when the payer thinks the number of services is not supported.

If you still see M63

Older remittances are the likely source. For a current same-day denial, check whether the service was billed twice by mistake. If it was performed twice for a valid reason, review the payer’s modifier and documentation rules for repeat services and resubmit a corrected claim with support.

M86 (Service denied because payment already made for same/similar procedure within set time frame.): The suggested replacement: denied because payment was already made for the same or similar procedure within a set time frame.
CO-B14 (Only one visit or consultation per physician per day is covered.): Only one visit or consultation per physician per day is covered.
CO-151 (Payment adjusted because the payer deems the information submitted does not support this many/frequency of services.): The information submitted does not support this many services or this frequency.

M63 FAQ

Can a second same-day service ever be paid?

Sometimes, when it is truly separate and the payer's rules allow a modifier or documentation to show that, for example a separate session or a different anatomic site.

Is M86 an exact match for M63?

Not exactly. M86 covers repeat payment within any set time frame, not only the same day, but it conveys the same idea: the payer already paid for this service within its limit.

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