Claim edit: Invalid patient control number

Stedi now rejects 837P professional, 837D dental, and 837I institutional claims that contain a patient control number (PCN) longer than 20 characters.

What is a patient control number?

A patient control number (PCN) is a tracking ID for a claim.

You create a PCN when you submit a claim. The payer sends the ID back in follow-up transactions: claim acknowledgments, Electronic Remittance Advice (ERAs), and claim status checks.

How the edit works

HIPAA-mandated X12 states that PCNs can be up to 20 characters. If you submit a claim with a PCN longer than 20 characters, the payer may reject the claim, which can delay payment to the provider.

This edit – the industry term for an automated validation rule – catches the issue before the claim reaches the payer.

Rejection errors

If you submit a claim that fails the edit using Stedi’s JSON or X12 Claim Submission API endpoints, you’ll get back an error response in real time. The response includes details in the errors array:

{
  "errors": [
    {
      "code": "33",
      "description": "Invalid Patient Control Number. The submitted patient control number, 123456789012345678901234567890, exceeds the maximum allowed length of 20 characters. Correct and resubmit.",
      "followupAction": "Please Correct and Resubmit"
    }
  ]
}

If you submit a claim that fails the edit using SFTP, Stedi will reject the claim with a 277CA claim acknowledgment. The acknowledgment will include a related claim status category code, claim status code, and error message:

STC*A7>21*[DATE]*U*[AMOUNT]********Invalid Patient Control Number. The submitted patient control number, 123456789012345678901234567890, exceeds the maximum allowed length of 20 characters. Correct and resubmit.~

Resolution tips

Follow these best practices when creating PCNs:

• Stick to 17 characters.
  X12 states patient control numbers can be up to 20 characters. But some payers cut off values longer than 17 characters in ERAs and claim acknowledgments.

• Use a unique patient control number for each claim.
  If multiple claims have the same patient control number, you may match the claim to the wrong ERA or acknowledgment.

• Use alphanumeric characters only.
  Patient control numbers can contain both letters and numbers. Avoid special characters. Many payers don’t handle them properly.

• Use random strings.
  Predictable formats, like {patientInitials}-{DOS}, can create duplicates.

Our recommendation: Use nanoid or a similar library to create a strong, unique 17-character patient control number for each claim.