X12 837P Reference

What Is X12 837P CLM05-3? Claim Frequency Type Code, Explained for Testers

Jul 27, 2026 · 4 min read

A claim correction or void that's missing the right frequency code — or missing its link back to the original claim — doesn't fail loudly. It gets denied days later with a rejection code that doesn't obviously point back to CLM05-3.

Quick answer

CLM05-3 is the third component of the CLM05 composite element in an X12 837P claim — it tells the payer whether the claim is an original submission, a replacement/correction, or a void/cancellation.

Valid code values

Original — a first-time claim submission

Replacement/Correction — corrects a previously submitted claim

Void/Cancel — cancels a previously submitted claim

Example

Synthetic example Generated by Synthibase

CLM*ACCT88213*450.00***11:B:1*Y*A*Y*Y*P*

The composite 11:B:1 — the final 1 marks this as an original claim. Synthetic claim data.

Where this trips people up

Submitting CLM05-3 = 7 (correction) without a REF*F8 segment carrying the original claim's payer control number is one of the most common causes of 277CA rejections at go-live — the payer has no way to match the correction to what it's correcting.

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X12 837P CLM Explained: Structure, Fields, and Common Mistakes

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What is X12 837P? Complete Format and Field Guide

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COB Claims Testing: How to Generate Coordination of Benefits Scenarios

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This page is written independently by Synthibase for testing and informational purposes. It is not an official publication of HL7 International or X12/Washington Publishing Company, and is not a substitute for reviewing the official standard or your trading partner's companion guide. See our Terms of Service for full legal terms.