CO-240: Diagnosis Inconsistent with Birth Weight

What Does CO-240 Mean?

CO-240 denies the claim as a contractual adjustment because the birth weight and diagnosis are inconsistent. The provider must correct the clinical data on the claim before it can be processed. This is not a payment decision — it is a data validation failure that prevents adjudication.

CARC 240 is a clinical coding edit specific to neonatal claims. The payer's system has detected that the diagnosis code assigned to the patient does not align with the birth weight recorded on the claim. ICD-10 includes specific diagnosis codes for different birth weight categories (extremely low birth weight, very low birth weight, low birth weight, normal birth weight), and the payer cross-references these diagnosis codes against the actual birth weight value on the claim.

This mismatch can occur in two directions: the birth weight field on the claim may contain an incorrect value, or the diagnosis code may reference the wrong birth weight category. In either case, the claim cannot be processed until the inconsistency is resolved. This is a data integrity check designed to prevent incorrect DRG assignments and payment calculations for neonatal claims, where birth weight is a critical factor in determining the appropriate payment level.

CARC 240 typically appears with CO (contractual obligation) and usually references the 835 Healthcare Policy Identification Segment for details. Resolution is almost always a matter of correcting the coding and resubmitting — either update the birth weight field or change the diagnosis code to match the actual clinical documentation.

Common Causes

How to Resolve

Compare the claim's birth weight field against the medical record and diagnosis codes, correct any inconsistencies, and resubmit.

1. Identify the mismatch Determine whether the birth weight field or the diagnosis code is incorrect by comparing both against the medical record.
2. Correct the claim Update the incorrect element — the birth weight value, the diagnosis code, or both — to match the clinical documentation.
3. Resubmit Resubmit the corrected claim. In rare cases where the weight is borderline, include clinical documentation supporting the diagnosis.

Common RARC Pairings

The RARC code tells you exactly what triggered the CO-240:

How to Prevent CO-240

• Ensure birth weight is accurately captured in the claim fields at admission, using the documented clinical measurement
• Train coders on neonatal ICD-10 birth weight category codes and their corresponding weight ranges
• Implement coding software edits that cross-check birth weight values against diagnosis codes before submission
• Audit neonatal claims regularly to catch birth weight/diagnosis mismatches before submission

General Prevention

• Ensure birth weight is accurately documented and recorded in the claim fields at the time of the newborn's admission
• Train coders on neonatal diagnosis coding and the relationship between birth weight categories and ICD-10 codes
• Implement coding software edits that cross-check birth weight values against diagnosis codes before claim submission
• Conduct regular audits of neonatal claims to identify birth weight and diagnosis inconsistencies before they result in denials
• Establish clear documentation protocols for NICU and nursery staff to ensure birth weight is captured accurately and consistently

Also Filed As

The same CARC 240 may appear with different Group Codes:

Related Denial Codes