BCBS CO-45 Fee Variance Payment Dispute
Charge exceeds fee schedule / contracted rate. Copy-paste appeal letter with documented overturn rate and attachment checklist for Blue Cross Blue Shield.
Verify before filing
Filing deadlines, appeal addresses, and policy criteria in this template reflect typical payer behavior at publication. Blue Cross Blue Shield updates policies frequently and plan-level rules vary by employer group, state, and line of business. Always cross-check the specific deadline and filing address on your EOB, and confirm current Blue Cross Blue Shieldmedical-policy language through the payer’s provider portal before submitting an appeal. Overturn-rate language below reflects AAPC-reviewer consensus, not payer-published statistics.
When to use this template
BCBS CO-45 variances are usually valid contractual adjustments. Investigate when same CPT pays different amounts across claims, when out-of-network rates apply to in-network provider, or when recent contract renegotiation wasn't reflected in claims system.
Attachment checklist
- Provider contract excerpt
- EOBs for disputed claims
- Network-status verification
Missing any one of these is the single largest cause of appeal denials. Build a pre-filing checklist before you submit.
Copy-paste letter template
Swap in your patient details at every [bracketed field]. Attach the documentation listed above. Submit within 180 days of the original adjudication.
[Payment Dispute - Not a Clinical Appeal] [Practice Letterhead] [Date] BCBS Provider Relations / Contract Management Re: Payment Dispute - CO-45 Fee Variance Provider: [Practice Name, NPI, TIN] Contract: [Contract ID / Effective Date] Dispute Period: [Date range] CPT Codes Affected: [List] Dear Provider Relations: We are disputing the allowed amounts on the following claims where the CO-45 contractual adjustment appears inconsistent with our contracted rate with BCBS. Contracted rate per contract dated [date]: CPT [X] = $[Y] allowable. Disputed claims: 1. Claim [#], DOS [date], Member [ID]: Allowed $[A] (expected $[Y], variance $[A-Y]) 2. [Repeat for each outlier claim] Root-cause analysis: [Identify the root cause, e.g. "Out-of-network fee schedule applied despite in-network status on the EOB"; "Case-rate contract not applied; claim paid per-procedure"; "Fee schedule not updated after contract renegotiation effective [date]"] Documentation attached: 1. Provider contract excerpt showing contracted rate for the CPT 2. EOBs for all disputed claims 3. Network-status verification from BCBS provider enrollment We respectfully request review and reprocessing of these claims at the correct contracted rate. Sincerely, [Practice Administrator / Billing Manager Name] [Practice Name] [NPI, TIN] [Contact phone and email]
Investigate only when the CO-45 variance is unusually large or inconsistent across claims. Routine CO-45 adjustments are valid contractual write-offs and should not be appealed.
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Related templates
Same code, different payer. Or same payer, different problem
Common questions on this template
How long do I have to file a CO-45 appeal with Blue Cross Blue Shield?
180 days from the initial adjudication date for most Blue Cross Blue Shield plans. Corrected claims (for administrative fixes like missing modifiers or auth numbers) have a different and usually longer window. Always confirm the specific deadline on the EOB for your claim.
What is the typical overturn rate for this denial type?
Moderate to high when a documented contract-rate mismatch exists. Success depends heavily on documentation completeness and whether the clinical criteria in Blue Cross Blue Shield's medical policy are matched point-by-point in the appeal.
Should I file this as a corrected claim or a formal appeal?
CO-45 denials are usually formal clinical appeals. The template below follows the formal-appeal structure. Use a corrected claim only if the fix is administrative (a missing modifier, wrong NPI) rather than clinical.
Can I reuse this template for other payers?
The structure works for any payer, but the filing address, deadline, and policy references are specific to Blue Cross Blue Shield. Check our other templates for payer-specific versions; we have 50+ payer/code combinations in the directory.
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