D0604Antigen Testing for a Public Health Related Pathogen, Including Coronavirus

What This Code Covers

D0604 covers antigen testing for a public health related pathogen, including coronavirus. This diagnostic test provides laboratory data to support clinical decision-making. Results are documented in the patient record and may influence treatment selection.

Billing Guide

Bill this code when:

• The procedure described by D0604 is performed and documented
• The clinical indication supports the procedure
• Documentation meets the payer's requirements for the service

Do not bill this code when:

• A different procedure was actually performed
• The procedure is included in another code being billed at the same visit
• Documentation does not support the medical necessity of the procedure
• The procedure is better described by D0601 (Caries risk assessment and documentation, with a f...)

Insurance and Denial Prevention

Key Payer Rules:

• Caries risk assessments may not be covered by all payers
• Some plans limit these assessments to pediatric patients or high-risk adults
• Documentation of the clinical rationale strengthens reimbursement

Common Denials and How to Respond:

• Frequency exceeded - Verify the payer's frequency schedule. Submit documentation of the clinical need if requesting an exception.
• Not medically necessary - Include the clinical indication and explain why this specific diagnostic procedure was required.
• Bundled with another procedure - Verify that the payer does not consider this code inclusive of another service billed on the same date.