CO-249 denial code
This claim has been identified as a readmission
How to fix it
Confirm the readmission determination and appeal where the second admission was clinically unrelated.
How to prevent it
Document the clinical relationship between admissions where readmission within the window is likely.
In practice
A patient is discharged after a heart failure admission and readmitted eleven days later. The payer treats the second admission as a readmission and returns CO-249, bundling it into the first.
Readmission policies reduce or exclude payment for a return admission within a defined window, on the view that the first admission should have addressed the problem.
The appeal turns on clinical relationship. Where the second admission was for an unrelated condition, or followed a planned staged procedure, documentation establishing that separation is what carries it.
What sits behind it
The windows vary by payer and by condition, with thirty days common for the conditions most associated with readmission programs. Some policies apply only to the same or clinically related diagnoses, and others apply more broadly.
Planned readmissions are usually excluded from these policies but have to be identified as such. A staged procedure scheduled at the time of the first discharge is not the event the policy targets, and saying so in the record at the time is what makes the exclusion available.
Because the determination is made automatically by date and diagnosis proximity, genuinely unrelated readmissions get caught. The appeal supplies the clinical reasoning the edit could not perform, which is why the contemporaneous record matters more than the appeal narrative.
Related codes
Terms used here — Medical Necessity · Appeal · Denial
How we handle it — Denial Management · Practice Analytics · Revenue Cycle Management
Primary sources
The rules behind CO-249, at the bodies that publish them.
- NCCI Policy Manual for Medicare Services (opens in a new tab)
Centers for Medicare & Medicaid Services — The reasoning behind the edits, chapter by chapter. Where the edit files tell you two codes conflict, this explains why — which is what an appeal has to address.
- National Correct Coding Initiative (NCCI) edits (opens in a new tab)
Centers for Medicare & Medicaid Services — The procedure-to-procedure and medically-unlikely edits behind most bundling denials. Checking these before submission prevents the denial entirely.
- 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.
Looking for a different code? Search all 190 CARC and RARC codes
Questions about CO-249
Thirty days is common, particularly for the conditions covered by readmission reduction programs, but it varies by payer and sometimes by diagnosis. Some policies apply only to related conditions while others reach any return admission in the period.
Usually, but they have to be identified as planned in the record at the time. A staged procedure scheduled at the first discharge is not what the policy targets, and documenting that contemporaneously is what makes the exclusion available later.
Documentation showing the second admission addressed something clinically unrelated to the first. The determination is made automatically by date and diagnosis proximity, so the appeal has to supply the clinical reasoning the edit could not.
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