CLM06 in X12 837P: A Field Guide to Provider or Supplier Signature Indicator
A claim submitted with CLM06 set to N because a signature is genuinely missing behaves differently downstream than a Y claim — if your test data never sends N, that entire denial path never gets exercised before go-live.
CLM06 is the Provider or Supplier Signature Indicator in an X12 837P claim — a single Y/N flag stating whether the provider's signature is on file authorizing the services billed.
Valid code values
Example
The first Y after the CLM05 composite is CLM06, confirming a provider signature is on file. Synthetic claim data.
Where this trips people up
Because Y is the near-universal real-world value, many synthetic datasets hardcode CLM06 to Y across every fixture — which means the payer edit that rejects or pends claims on N never gets exercised in pre-production testing and is discovered for the first time when a real claim trips it in production.