Medicare reference tools: MAC by state · Self-administered drug (SAD) list — Part B vs Part D · Drug billing modifiers (JW/JZ/JA/JB) · What changed
How Medicare drug coverage works
For physician-administered drugs billed under Medicare Part B, payment depends on the diagnosis. Each Medicare Administrative Contractor (MAC) publishes a Local Coverage Determination (LCD) stating whether a drug is reasonable and necessary, and a companion Billing & Coding Article that lists the actual covered ICD-10 diagnosis codes and HCPCS codes. A National Coverage Determination (NCD), where one exists, applies nationwide. Coverage can differ by MAC, so always confirm the article that applies in your state. Each drug page here shows the covered diagnoses, the source Article/LCD with its update date, and the ASP+6% reimbursement.
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