Billing and Coding: Vitamin D Assay Testing

This policy provides Medicare billing, coding and documentation requirements for Vitamin D assay testing per local coverage determination L33996. Coverage requires an authorized provider order, a valid ICD-10-CM diagnosis that justifies the test, and signed medical records including assessment, relevant history, and test results; ABN rules and modifiers (GA/GX/GY/GZ) apply when denials are anticipated with Part A-specific requirements (e.g., occurrence code 32). Follow NCCI/OPPS edits and the local coverage policy for coding, modifier application, and any frequency limits.

"Vitamin D assay testing billed to Medicare Part A or Part B MAC is covered when ordered by an authorized provider (physician or state-authorized non-physician) and the service is otherwise consiste..."

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