Background: these Part D PA criteria define prior authorization requirements for drugs on Independent Health's 2025 Medicare Advantage Part D formularies. The policies include: (1) Part B vs Part D considerations — determinations are based on route, site of care, and how medication will be obtained/used; self‑administration after training or pharmacy fill delivered to the provider office may permit Part D coverage, otherwise drugs may be Part B (provider‑administered); (2) specialty prescriber requirements — many agents are restricted to specific specialties such as oncology, pulmonology, cardiology, neurology, endocrinology, hematology, immunology, or psychiatry; (3) exclusions — common exclusions include pregnancy, severe hepatic impairment (Child‑Pugh class C), certain cardiac or renal contraindications, dementia‑related psychosis for some antipsychotics, and disallowed off‑label uses (e.g., GLP‑1 agonists for weight management under Part D); (4) required diagnostics — product sections list required baseline tests such as mutation/genetic tumor testing (ALK, ROS1, EGFR, BRAF, RET, BRCA, PIK3CA, etc.), creatinine clearance or eGFR, LFTs/Child‑Pugh, ECG/QTc, CBC/ANC, platelets, 24‑hour UFC, sputum cultures, TB screening (PPD or IGRA) for many immunomodulators; and (5) reauthorization rules — many products require objective evidence of clinical benefit or stability (e.g., spirometry for COPD, lab improvements like LDL or UPCR, decreased symptoms, updated LFTs) with typical intervals noted per product (examples: initial 6-month evaluation for some agents then annual). Definitions: PA = Prior Authorization; Part B vs Part D determination = determination whether drug is covered under Medicare Part B (provider-administered) or Part D (pharmacy benefit) based on administration and how drug is obtained/used; Child-Pugh class C = severe hepatic impairment; UFC = 24‑hour urine free cortisol.