Other and unspecified myopathies (G72)
Clinical Information
Dermatomyositis - A subacute or chronic inflammatory disease of muscle and skin, marked by proximal muscle weakness and a characteristic skin rash. The illness occurs with approximately equal frequency in children and adults. The skin lesions usually take the form of a purplish rash (or less often an exfoliative dermatitis) involving the nose, cheeks, forehead, upper trunk, and arms. The disease is associated with a complement mediated intramuscular microangiopathy, leading to loss of capillaries, muscle ischemia, muscle-fiber necrosis, and perifascicular atrophy. The childhood form of this disease tends to evolve into a systemic vasculitis. Dermatomyositis may occur in association with malignant neoplasms. (From Adams et al., Principles of Neurology, 6th ed, pp1405-6)
Polymyositis - Diseases characterized by inflammation involving multiple muscles. This may occur as an acute or chronic condition associated with medication toxicity (DRUG TOXICITY); CONNECTIVE TISSUE DISEASES; infections; malignant NEOPLASMS; and other disorders. The term polymyositis is frequently used to refer to a specific clinical entity characterized by subacute or slowly progressing symmetrical weakness primarily affecting the proximal limb and trunk muscles. The illness may occur at any age, but is most frequent in the fourth to sixth decade of life. Weakness of pharyngeal and laryngeal muscles, interstitial lung disease, and inflammation of the myocardium may also occur. Muscle biopsy reveals widespread destruction of segments of muscle fibers and an inflammatory cellular response. (Adams et al., Principles of Neurology, 6th ed, pp1404-9)
Instructional Notations
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- arthrogryposis multiplex congenita Q74.3
- dermatopolymyositis M33
- ischemic infarction of muscle M62.2
- myositis M60
- polymyositis M33.2
Diseases of the nervous system (G00–G99)
Diseases of myoneural junction and muscle (G70-G73)
G72 Other and unspecified myopathies
- G72.0 Drug-induced myopathy
- G72.1 Alcoholic myopathy
- G72.2 Myopathy due to other toxic agents
- G72.3 Periodic paralysis
G72.4 Inflammatory and immune myopathies, not elsewhere classified
- G72.41 Inclusion body myositis [IBM]
- G72.49 Other inflammatory and immune myopathies, not elsewhere classified
G72.8 Other specified myopathies
- G72.81 Critical illness myopathy
- G72.89 Other specified myopathies
- G72.9 Myopathy, unspecified
Other and unspecified myopathies (G72)