CARC 70 Active

OA-70: Cost Outlier Adjustment

TL;DR

Adjustment in a COB or secondary payer context. Review the coordination of benefits details to determine the responsible party.

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-70 Mean?

With OA (Other Adjustments), CARC 70 typically appears in a coordination of benefits (COB) context. Secondary payer applies cost outlier methodology. The financial responsibility depends on the specific arrangement between payers — review the primary payer's EOB and the COB terms to determine the correct course of action.

CARC 70 means the payer adjusted the payment based on cost outlier adjustment. The reimbursement was calculated using the payer's fee schedule, contracted rate, or regulatory payment methodology rather than the billed charge.

Common scenarios that trigger this adjustment include: the total cost of the inpatient stay exceeds the cost outlier threshold for the assigned DRG, triggering additional outlier payment; Medicare pays a cost outlier amount equal to 80% of the difference between the total costs and the outlier threshold; The standard DRG payment is supplemented with an additional cost outlier payment for exceptionally expensive cases. The group code paired with CARC 70 determines who bears the financial responsibility — CO places it on the provider as a contractual obligation, OA indicates a coordination of benefits or other payer adjustment, PR shifts it to the patient.

Common Causes

Cause Frequency
Secondary payer cost outlier Secondary payer applies cost outlier methodology Most Common

How to Resolve

  1. Review the coordination of benefits Examine the OA-70 adjustment to understand how it fits within the primary/secondary payer relationship or other multi-payer context.
  2. Verify primary payer adjudication Review the primary payer's EOB to understand the basis for the secondary payer's OA adjustment.
  3. Determine the responsible party Based on the COB review, identify whether the adjustment should be absorbed, billed to another payer, or if additional documentation is needed.
  4. Appeal or resubmit if needed Appeal with documentation if the cost outlier calculation is incorrect.
  5. Follow up Monitor the claim status and take additional action as needed based on the COB determination.
Appeal Guide

Appeal with documentation if the cost outlier calculation is incorrect.

Common RARC Pairings

The RARC code tells you exactly what triggered the OA-70:

RARC Description
N14 Payment based on contractual amount Review secondary payer outlier calculation →

How to Prevent OA-70

Also Filed As

The same CARC 70 may appear with different Group Codes:

CO-70 PR-70

Related Denial Codes

OA-44 — Prompt-Pay Discount OA-45 — Charge Exceeds Fee Schedule/Maximum Allowable OA-69 — Day Outlier Amount OA-59 — Multiple/Concurrent Procedure Rules Applied OA-24 — Charges Covered Under Capitation/Managed Care

Sources

  1. https://x12.org/codes/claim-adjustment-reason-codes
  2. https://revenuecyclemgmt.com/claim-adjustment-reason-codes/
  3. https://www.cms.gov/regulations-and-guidance/guidance/manuals/downloads/clm104c22pdf.pdf
  4. Codes maintained by X12. Visit x12.org for official definitions.