ICD-10 Code B58.82 – Toxoplasma myositis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B58.82 – Toxoplasma myositis
What it is
Toxoplasma myositis is inflammation of skeletal muscle caused by infection with Toxoplasma gondii. Use this code when documentation identifies muscle involvement from toxoplasmosis.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include muscle pain, tenderness, weakness, or swelling, with evidence supporting parasitic myositis rather than a nonspecific muscle disorder.
When to use this code
Use B58.82 when the provider documents toxoplasma infection affecting muscle tissue, such as toxoplasma myositis or parasitic myositis due to Toxoplasma gondii. This code is appropriate when the diagnosis is confirmed or clearly stated in the record. Check documentation if the note only says toxoplasmosis without muscle involvement.
Do not use for
Do not use this code for generalized toxoplasmosis without myositis, or for muscle pain of unknown cause. If the record describes another infectious myopathy, code the documented condition instead.
Coding tip
Confirm that the provider links the muscle findings to toxoplasma infection before assigning B58.82.