CARC B22 Active

OA-B22: Payment Adjusted Based on Diagnosis

TL;DR

Payment was adjusted because the diagnosis does not support the billed procedure. Verify diagnosis-procedure compatibility, code to the highest specificity, and appeal with clinical documentation if the procedure was medically necessary for the diagnosis.

Action
Review & Decide
Who Pays
Depends
Appeal
Yes
Patient Impact
Indirect
Disclaimer
This content is for informational purposes only and does not constitute professional billing advice. Always verify information against your payer contracts and current coding guidelines. Consult a certified billing specialist for specific claim issues.

What Does OA-B22 Mean?

CARC B22 indicates the payer adjusted the payment based on the diagnosis codes submitted with the claim. The diagnosis either does not support medical necessity for the billed procedure, triggers a lower fee schedule rate, results in a different DRG assignment, or does not appear on the payer's approved diagnosis list for the service (LCD/NCD).

This is one of the most common coding-related adjustments. It frequently occurs when diagnosis codes are too generic or non-specific, when the LCD/NCD restricts coverage of the procedure to specific diagnoses, when the diagnosis-procedure combination does not establish medical necessity, or when incorrect coding causes a DRG weight reduction for inpatient claims.

The resolution path depends on whether the issue is a coding error (wrong or non-specific diagnosis) or a coverage determination (the diagnosis genuinely does not support the procedure). Coding errors can be corrected and resubmitted. Coverage determinations require a clinical appeal with documentation supporting medical necessity.

Common Causes

Cause Frequency
Retroactive DRG reclassification A diagnosis code change during a post-payment audit resulted in reclassification to a different DRG Common

How to Resolve

Verify diagnosis accuracy and specificity, check LCD/NCD coverage criteria, and correct coding or appeal with clinical documentation.

  1. Review diagnosis coding Verify the diagnosis codes are accurate, specific to the highest level, and current. Check the medical record to ensure the codes reflect the documented condition.
  2. Check LCD/NCD coverage criteria Review the applicable Local or National Coverage Determination for the procedure and verify the submitted diagnosis codes are on the approved list.
  3. Correct coding errors If the diagnosis code is incorrect or insufficiently specific, update to the proper code and resubmit the claim.
  4. Appeal with clinical documentation If the coding is correct but the payer contests medical necessity, appeal with physician notes, test results, and clinical guidelines supporting the procedure for this diagnosis.
  5. Reference LCD/NCD if applicable In the appeal, specifically reference the LCD/NCD showing the diagnosis qualifies for coverage of the procedure.
Appeal Guide

Appeal with documentation supporting the original diagnosis if the reclassification was incorrect.

How to Prevent OA-B22

Also Filed As

The same CARC B22 may appear with different Group Codes:

CO-B22 PR-B22

Related Denial Codes

OA-4 — Procedure Code Inconsistent with Modifier OA-5 — Procedure Code Inconsistent with Place of Service OA-6 — Procedure/Revenue Code Inconsistent with Patient Age OA-7 — Procedure/Revenue Code Inconsistent with Patient Gender OA-8 — Procedure Code Inconsistent with Provider Type/Specialty

Sources

  1. https://x12.org/codes/claim-adjustment-reason-codes
  2. https://www.cms.gov/regulations-and-guidance/guidance/manuals
  3. Codes maintained by X12. Visit x12.org for official definitions.