M31.7

Applicable To

• Microscopic polyarteritis

Approximate Synonyms

• Microscopic polyarteritis nodosa

Clinical Information

• A primary systemic vasculitis of small- and some medium-sized vessels. It is characterized by a tropism for kidneys and lungs, positive association with anti-neutrophil cytoplasmic antibodies anca), and a paucity of immunoglobulin deposits in vessel walls.

• A systemic necrotizing vasculitis that typically affects the small and medium-sized muscular arteries. In some cases, however, microscopic vessels are also affected e.g., in the kidneys), a condition that has been called microscopic polyarteritis or polyangiitis; this disorder is felt to be more closely associated with wegener’s granulomatosis than to classic polyarteritis nodosa.

Details

• M31.7 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.

• The 2023 edition of ICD-10-CM M31.7 became effective on October 1, 2022.

• This is the American ICD-10-CM version of M31.7 – other international versions of ICD-10 M31.7 may differ.