ICD-10-CM 2027
ICD-10 code for microscopic polyarteritis
From the official ICD-10-CM alphabetic index entry “Polyarteritis › microscopic”. Page updated September 29, 2026.
About coding microscopic polyarteritis
The ICD-10-CM code for microscopic polyarteritis is M31.7 (Microscopic polyangiitis).
Within M31 (other necrotizing vasculopathies), M31.7 is specifically for microscopic polyangiitis. Related codes cover hypersensitivity angiitis (M31.0), thrombotic microangiopathy (M31.1), Lethal midline granuloma (M31.2), Wegener's granulomatosis (M31.3), aortic arch syndrome [Takayasu] (M31.4), giant cell arteritis with polymyalgia rheumatica (M31.5), other giant cell arteritis (M31.6), other specified necrotizing vasculopathies (M31.8) and 1 more.
Don't report M31.7 together with the conditions in its Excludes1 note: polyarteritis nodosa (M30.0).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
Don't confuse with (Excludes1 for M31.7)
- polyarteritis nodosa (M30.0)
Common questions about microscopic polyarteritis ICD-10 codes
What is the ICD-10 code for microscopic polyarteritis?
- M31.7 — Microscopic polyangiitis.
Is M31.7 billable?
- Yes. M31.7 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M31.7 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M31.7 as a principal diagnosis.
Is M31.7 a CC or MCC?
- M31.7 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.