N20 remark code

Remittance advice remark code N20. Remark codes add detail to the reason code on the same claim line.

Not payable with same-day service

Unofficial reference. This is our own plain-English explanation, not the official code text. Payer rules differ. Verify with the payer and the official X12 code list. AlphaPrefix is not affiliated with X12, CMS or any payer. Data last updated Nov 11, 2026.

What N20 means

This service cannot be paid when billed with another particular service on the same date of service.

N20 flags a same-day conflict. The payer will pay one of the two services but considers the other unpayable when both fall on one date, often because one includes the other or the policy does not allow the pair together.

It normally explains a bundling or policy denial code. Whether a modifier or separate documentation can unlock payment depends on the payer's policy.

Common causes

• Two services that a payer policy treats as mutually exclusive were billed on one date.
• An E/M visit was billed on the same day as a procedure without a modifier showing it was separate.
• The same service was reported by two providers in the same group on one day.

What to do next

1. Identify which other service on that date caused the conflict.
2. Review the documentation to see if both services were separately identifiable and medically necessary.
3. Correct and resubmit with an appropriate modifier only when the record supports it.
4. If the policy simply does not allow the pair, accept the adjustment per the group code.

Related codes

• 97 (reason code) Service included in another payment
• N19 (remark code) Incidental to the main procedure
• M80 (remark code) Not payable alongside an earlier service