CO-220 denial code
The applicable fee schedule does not contain the billed code
How to fix it
Confirm the code is correct and current, then contact provider relations to have it loaded.
How to prevent it
New codes are frequently missing from payer fee schedules in January. Test-bill high-volume new codes early.
In practice
A practice begins billing a code introduced in the January update. The payer has not loaded it into its fee schedule yet, and every claim returns CO-220.
The code is valid and the service is covered. What is missing is a price, and a payer with no rate for a code cannot adjudicate a claim carrying it.
Provider relations is the route rather than appeals, since there is nothing to appeal. Once the rate is loaded, the held claims reprocess, and the practical question is how long that takes and whether filing deadlines allow for it.
What sits behind it
January is the predictable peak. New codes take effect on the first of the month while payer fee schedule loading runs on its own timetable, and the gap between the two can run to weeks or months for smaller payers.
Test-billing high-volume new codes early is the practical control. Submitting a small number in the first weeks reveals which payers have loaded the code before the practice has accumulated a month of unpayable claims behind it.
Where a code is genuinely absent from a contract rather than merely unloaded, this becomes a negotiation. A service the practice performs routinely that has no contracted rate is a gap worth closing at renewal rather than absorbing indefinitely.
Related codes
Terms used here — Allowed Amount · Contractual Adjustment · CPT Code
How we handle it — Revenue Cycle Management · Practice Analytics · Denial Management
Primary sources
The rules behind CO-220, at the bodies that publish them.
- Medicare Physician Fee Schedule lookup (opens in a new tab)
Centers for Medicare & Medicaid Services — Official allowed amounts by CPT/HCPCS code and locality. The reference point most commercial contracts are written against as a percentage.
- Medicare Claims Processing Manual (opens in a new tab)
Centers for Medicare & Medicaid Services — The operative manual for how Medicare claims must be coded, submitted, adjusted and appealed. When a payer policy and a vendor's advice disagree, this settles it.
- Claim Adjustment Reason Codes (CARC) (opens in a new tab)
X12 — The authoritative, maintained CARC list. Our denial code lookup explains these in plain English; X12 is where the canonical definitions live.
Looking for a different code? Search all 190 CARC and RARC codes
Questions about CO-220
There is nothing to appeal — the payer has no rate to adjudicate against. Provider relations is the correct route, and once the rate is loaded the held claims reprocess. Watch the filing deadline while that happens.
Because new codes take effect on 1 January while payer fee schedule loading runs on its own timetable. The gap can stretch to weeks or months for smaller payers, during which every claim carrying a new code is unpayable.
By test-billing a small number of claims with high-volume new codes in the first weeks of January. That reveals which payers have loaded the code before the practice accumulates a month of claims it cannot get paid.
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