CO-4594% variance recovery rate when contract schedule is attached
Charge exceeds fee schedule / maximum allowable amount
Contractual adjustment per provider agreement. (Can hide systematic underpayments).
Is this code appealable?
Yes, Highly Appealable
Appealable as an Underpayment Variance Dispute whenever paid amount is lower than executed contractual fee schedule.
Plain Language Meaning
What CO-45 actually means
Standard contractual write-off, but frequently conceals systematic payer underpayments below contracted fee schedules.
Upstream Prevention Strategy:
Automated contract modeling and remittance variance detection on every 835 line item.
Underlying Root Causes
Why payers issue CO-45
01. Payer loaded outdated fee schedule rates in their claims adjudication engine
02. Incorrect carve-out calculation on high-cost implants or biologics
03. Improper multiple procedure payment reduction (MPPR) formula applied
Clinical Dispute Strategy
How to appeal CO-45 and win
Submit Contract Variance Dispute Letter with executed contract rate appendix and line-by-line underpayment ledger.
Mandatory Attachment Checklist
- •Contract fee schedule exhibit
- •835 remittance variance comparison matrix
Common Mistakes That Cause Upholds
- •Blindly writing off CO-45 without auditing against active contract rate tables
Zero Long-Term Contracts · Instant 835 Ingest
RecoupOps drafts appeals for CO-45 automatically.
Connect one month of remittances to generate complete clinical packages with LCD citations in 15 seconds.
HIPAA BAA on Every Plan Live in Under 48 Hours 14-Day Full Production Sandbox