CO-141 denial code
Claim spans eligible and ineligible periods of coverage
How to fix it
Split the claim so each portion is billed to the payer responsible for that period.
How to prevent it
Verify coverage for the full span of multi-day services, not just the admission date.
In practice
A home health episode runs from the twentieth of one month to the fifth of the next. The patient's coverage terminated on the last day of the first month, and the claim for the whole span returns CO-141.
Part of the service period was covered and part was not. The payer will not pay a claim spanning both, because it cannot separate its own liability from the portion outside it.
Splitting the claim at the coverage boundary and submitting each portion to the payer responsible for that period resolves it. The second portion may go to a new plan, to Medicaid, or to the patient depending on what replaced the coverage.
What sits behind it
Multi-day and episodic services carry this exposure structurally: inpatient stays, home health episodes, therapy courses, durable medical equipment rental months and infusion series all span dates and can straddle a boundary that a single-day service never would.
Verification practice is what determines whether it is caught. Checking coverage for the admission or start date says nothing about the end date, and a plan terminating mid-episode is invisible until the claim fails. Verifying across the full span is the specific control.
CO-239 states the same thing with explicit instruction to rebill as separate claims. Where a payer sends that code instead, the required action is spelled out, but the underlying situation and the fix are identical.
Related codes
Terms used here — Eligibility Verification · Coordination of Benefits · Clean Claim
How we handle it — Eligibility Verification · Claims Management · AR Management
Primary sources
The rules behind CO-141, at the bodies that publish them.
- Medicare Secondary Payer Manual (opens in a new tab)
Centers for Medicare & Medicaid Services — When Medicare pays second, and to whom the claim goes first. Coordination-of-benefits denials are resolved here rather than with the patient.
- Medicare Coverage Database (LCD/NCD) (opens in a new tab)
Centers for Medicare & Medicaid Services — Searchable national and local coverage determinations. The direct answer to whether a diagnosis supports medical necessity for a given procedure.
- 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-141
Submit one claim covering the dates the plan was in force and a separate claim for the remaining dates to whichever payer is responsible for that period. Each claim carries only its own date range, so neither straddles the boundary the payer cannot adjudicate across.
Anything spanning multiple days — inpatient stays, home health episodes, therapy courses, equipment rental months and infusion series. Single-day services cannot straddle a boundary, which is why this code concentrates in episodic and facility billing.
They describe the same situation, but CO-239 states the remedy explicitly by instructing you to rebill as separate claims. The underlying problem and the correction are identical; only the wording of the instruction differs between payers.
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