Polyosteoarthritis

M15.0 identifies primary generalized osteoarthritis — idiopathic degenerative joint disease affecting multiple joints simultaneously, without an underlying traumatic, metabolic, or inflammatory cause.

Osteoarthritis of the distal interphalangeal joints of the fingers, presenting as bony enlargements (Heberden's nodes) with associated joint pathology.

Osteoarthritis of the proximal interphalangeal (PIP) joints of the hand, presenting with characteristic bony enlargements and associated joint degeneration.

Polyosteoarthritis arising from an identifiable underlying cause affecting multiple joints simultaneously, classified under the M15 polyosteoarthritis parent category.

M15.4 identifies erosive osteoarthritis, a polyosteoarthritis subtype characterized by inflammatory erosive changes affecting multiple joints simultaneously, distinguished from standard degenerative OA by its more aggressive cartilage and subchondral bone destruction.

M15.8 captures osteoarthritis involving multiple joints that doesn't fit any other named M15 subcategory — not primary generalized (M15.0), not Heberden's nodes (M15.1), not Bouchard's nodes (M15.2), not secondary multiple arthritis (M15.3), and not erosive OA (M15.4).

M15.9 identifies osteoarthritis affecting multiple joints where the documentation does not specify which joints are involved, the etiology, or the pattern of involvement — classified as generalized osteoarthritis NOS.