Other conditions related to polyarteritis nodosa

This code represents various vasculitic syndromes that share features with polyarteritis nodosa (PAN) but do not fully meet the diagnostic criteria for classic PAN. These conditions involve inflammation and necrosis of medium-sized arteries, potentially affecting multiple organ systems. It encompasses atypical presentations or variants of PAN.

Use this code for documented cases of vasculitis that are explicitly described as "polyarteritis nodosa-like," "atypical polyarteritis nodosa," or "variant polyarteritis nodosa" when the specific type is not classifiable to a more precise code. Documentation should clearly indicate a diagnosis related to PAN but not classic PAN itself, such as microscopic polyangiitis or eosinophilic granulomatosis with polyangiitis if a more specific code isn't available or if the physician explicitly states "other conditions related to PAN."

• Do not use this code for classic polyarteritis nodosa (M30.0).
• Always seek more specific codes for other vasculitides (e.g., microscopic polyangiitis, eosinophilic granulomatosis with polyangiitis) if documented.
• Requires physician documentation explicitly stating "other conditions related to polyarteritis nodosa" or a similar variant/atypical description.