Every denial code, and whether it's worth fighting.

These services are not deemed a medical necessity by the payer.

This (these) diagnosis(es) is (are) not covered.

Precertification / authorization / notification absent.

Authorization number is missing, invalid, or doesn't match.

The benefit for this service is included in another service already paid (NCCI).

Processed based on multiple- or concurrent-procedure rules.

This procedure is not paid separately (bundled).

Procedure code is inconsistent with the modifier — or a required one is missing.

The diagnosis is inconsistent with the procedure.

Procedure/revenue code is inconsistent with the patient's age.

Documentation doesn't support this many / this frequency of services.

Charge exceeds the fee schedule / contracted allowed amount.

Service/equipment/drug not covered under the patient's current benefit plan.

Non-covered charge under the patient's plan.

A benefit maximum for this service has been reached.

Service not covered under the patient's current benefit plan.

Claim/service not covered by this payer or contractor — send it elsewhere.

Expenses incurred after the patient's coverage had terminated.

This care may be covered by another payer per coordination of benefits.

Service is covered under a capitation agreement / managed care plan.

Work-related injury — workers' compensation carrier is liable.

Claim lacks information or has a submission/billing error.

Exact duplicate claim or service.

The time limit for filing this claim has expired.

Patient/insured health ID number and name don't match.

An attachment or additional documentation is required.

Provider was not certified/eligible to be paid for this service on this date.

Deductible amount — the patient's cost share, not a denial.

Coinsurance amount — the patient's cost share, not a denial.

Co-payment amount — the patient's fixed cost share, not a denial.