ICD-10 Code: M33.21 – Polymyositis with respiratory involvement

ICD-10 code M33.21 corresponds to Polymyositis with respiratory involvement. This code is classified under the chapter M33 Dermatopolymyositis, which is part of the M30-M36: Systemic connective tissue disorders category.

The parent chapter is Diseases of the musculoskeletal system and connective tissue.