CO-19767% overturn in Medicare Advantage (KFF 2026)
Precertification / Authorization / Notification absent
The service or procedure required pre-certification or prior authorization, which was missing or not obtained.
Is this code appealable?
Yes, Highly Appealable
Highly appealable if retroactive authorization is allowed, if clinical emergency justification applies, or if prior authorization was obtained under a cross-referenced authorization number.
Plain Language Meaning
What CO-197 actually means
The insurer claims they never authorized this care before it happened, or the authorization on file does not match the exact CPT code billed.
Upstream Prevention Strategy:
Implement real-time 835 auth cross-matching and pre-encounter auth verification 48-72h prior to procedure.
Underlying Root Causes
Why payers issue CO-197
01. CPT code billed differed from the CPT code initially authorized during surgery/encounter
02. Retroactive insurance policy change between scheduling and time of service
03. Payer auth number omitted or transposed in Box 23 of CMS-1500 / 837P Loop 2300
04. Urgent/emergent add-on procedure performed during an authorized primary surgery
Clinical Dispute Strategy
How to appeal CO-197 and win
Cite CMS-0057-F emergency exception rules, enclose physician clinical intraoperative notes, and attach the original auth authorization confirmation with proof of medical necessity.
Mandatory Attachment Checklist
- •Intraoperative surgical report
- •Original authorization letter
- •Emergency clinical intake summary
- •Payer policy bulletin copy
Common Mistakes That Cause Upholds
- •Submitting a generic appeal without the original auth request log
- •Failing to explain CPT code deviation due to intraoperative discovery
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