A practical guide to completing Box 23: Prior Authorization Number accurately and consistently.

From our workflow: Most avoidable errors with Prior Authorization Number begin when a prior claim is treated as the source. We go back to the authorization or referral notice and the payer’s current instructions before deciding what belongs on the form.

Report the authorization, referral, or other payer-issued number when required.

An entry for Prior Authorization Number may be the right length and still be the wrong value. The surrounding coverage, provider, and service information has to support it.

General rule: Payer-specific instructions, contracts, program manuals, and current coding guidance can add to or override general form guidance. Verify requirements before submission.

Why this deserves a careful check

An entry for Prior Authorization Number may be the right length and still be the wrong value. The surrounding coverage, provider, and service information has to support it.

If Prior Authorization Number fails an edit, verify the source and the payer rule before changing it. A guessed value can move the problem from rejection to denial.

A reliable way to enter the data

  1. Identify the person, organization, date, code, or identifier the field is asking for.
  2. Locate the source document: insurance card, eligibility response, clinical note, authorization, provider enrollment record, fee schedule, or payer remittance.
  3. Enter the value using the form’s structure and the payer’s required format.
  4. Compare it with related fields and service lines for consistency.
  5. Save evidence of the source and the final submitted claim.

What to double-check

  • Entering an internal note number.
  • Using an expired authorization.
  • Assuming approval guarantees payment.

A prior claim is useful for comparison, but we recheck Prior Authorization Number against the authorization or referral notice and the payer’s current instructions. Coverage, enrollment, authorizations, codes, and addresses can change between visits.

A quick check before submission

  • Verify the exact number.
  • Confirm date range, units, provider, and service.
  • Match formatting.
  • Keep the authorization documentation.
  • Compare the completed claim with the clinical and billing record.
  • Confirm the receiving address or electronic route.
  • Keep a secure copy and proof of submission.

Where software helps—and where it does not

For Prior Authorization Number, software should catch missing values and obvious conflicts while leaving coverage, coding, and documentation decisions to the user and current payer rules.

Apply this in software: For a workflow that keeps claim data reusable and reviewable, see the CMS-1500 paper and electronic filing options. Software can enforce format and consistency, but the source record and payer instructions still control the claim.
Privacy reminder: Use fictional data for training and printer tests. Claims contain protected information and should be stored, transmitted, printed, and destroyed through approved secure processes.

Written and reviewed by

1500Software Development Team

Covers the software, printing, validation, export, and troubleshooting steps described on this page.

1500Software Claims Review Team

Reviews field placement, provider roles, source records, and practical correction steps.

Reviewed July 26, 2026. Always follow the receiving payer’s current instructions and companion guide.

Primary references

These are the national sources we use as a starting point. The receiving payer may add more specific instructions.