CARC 9: The Diagnosis Is Inconsistent With the Patient's Age

What it means

The payer rejected or adjusted the claim because the diagnosis code submitted does not match what is clinically expected for the patient's age as recorded in their system, based on the patient's date of birth on file.

Common causes

Incorrect date of birth entered on the claim or in the patient's demographic record
A diagnosis code that has age-specific restrictions (e.g., pediatric-only or adult-only codes) used for the wrong age group
Transposed or mistyped digits in the date of birth field
Use of an outdated or incorrect ICD-10-CM code that no longer aligns with current age-based edits
Data entry error when selecting the diagnosis from an EHR dropdown or problem list
Patient's actual age differs from what the payer has on file due to outdated enrollment or eligibility data

How to fix it

Verify the patient's date of birth against a government-issued ID or insurance card and correct it if needed
Confirm the diagnosis code is clinically appropriate for the patient's actual age using ICD-10-CM age-edit guidance
Check for coding errors such as a transposed diagnosis code or wrong selection from an EHR template
Correct the claim (date of birth and/or diagnosis code) and resubmit as a corrected claim, not a duplicate
If the diagnosis is accurate and the age on file is correct, contact the payer to confirm why the edit triggered and request manual review
Update the patient's demographic file in your practice management system if the date of birth was wrong

Appeal / resubmit

If the diagnosis is clinically correct for the patient's true age, gather supporting documentation such as the medical record, encounter note, and a copy of the patient's ID showing date of birth. Submit a corrected claim first if a data entry error is identified, since this often resolves the issue faster than a formal appeal. If the payer's records show an incorrect age despite accurate submission, request they update their eligibility file and reprocess the claim, and include a clear explanation referencing the specific diagnosis-age mismatch flagged.

Related codes

Frequently asked

Does this mean I used the wrong diagnosis code?

Not necessarily. It often means the diagnosis code has age restrictions and either the code or the patient's date of birth on file doesn't match what's expected, but it could also be a data entry error rather than a true coding error.

Can I just resubmit the same claim?

No, resubmitting without correcting the underlying issue will likely result in the same denial or rejection. Identify whether the date of birth or diagnosis code needs correction first.

What if the diagnosis really is correct for this patient's age?

Double-check the date of birth on file with the payer, since a mismatch there is a common trigger. If everything is accurate, you may need to contact the payer for manual review.

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This content is informational only and does not constitute billing or legal advice. It does not guarantee claim resolution or reimbursement.