CO-240 denial code
The diagnosis is inconsistent with the patient's birth weight
How to fix it
Verify the recorded birth weight and the diagnosis, and correct whichever is wrong.
How to prevent it
Capture birth weight accurately for neonatal claims; it drives both coding and payment.
In practice
A neonatal claim carries a diagnosis specifying a birth weight band that does not match the weight recorded on the payer's record. The claim returns CO-240.
ICD-10-CM codes several neonatal conditions by birth weight range, and payers validate the code against the weight they hold. A discrepancy between the two stops the claim.
Verify the recorded birth weight against the delivery record and confirm the code matches it. Both elements drive payment in neonatal care, so an error in either is worth correcting carefully rather than quickly.
What sits behind it
Birth weight is one of the more consequential data points in neonatal billing. It determines diagnosis selection, drives severity classification, and in facility payment influences the case grouping, so an error propagates well beyond a single line.
The bands are narrow and adjacent codes cover close ranges, which makes transcription errors easy and their effect disproportionate. A weight recorded in grams and entered in a field expecting a different precision is a recurring source.
Where the payer's record disagrees with the delivery record, the delivery record governs and the payer's data needs correcting. That is worth pursuing rather than recoding to match, because the recorded weight also affects the child's clinical record.
Related codes
Terms used here — ICD-10-CM · Claim Scrubbing · Medical Necessity
How we handle it — Medical Coding · Denial Management · Claims Management
Primary sources
The rules behind CO-240, at the bodies that publish them.
- CPT code set (opens in a new tab)
American Medical Association — Maintainer of CPT. Annual changes to CPT are the most common cause of a sudden, unexplained rise in denials each January.
- 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.
- 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.
Looking for a different code? Search all 190 CARC and RARC codes
Questions about CO-240
Because ICD-10-CM classifies several neonatal conditions by birth weight band, and the weight also drives severity classification and facility case grouping. An error in a single field propagates through diagnosis selection and payment together.
The delivery record governs, and the payer's data should be corrected rather than the code changed to match it. The recorded weight affects the child's clinical record as well as the claim, so accuracy matters beyond getting this one payment.
Through transcription, particularly where a weight recorded in grams is entered into a field expecting different units or precision. The bands are narrow and adjacent codes cover close ranges, so a small entry error crosses a boundary easily.
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