ICD-10 Code B69.81 – Myositis in cysticercosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B69.81 – Myositis in cysticercosis
What it is
B69.81 identifies inflammation of muscle caused by cysticercosis, a parasitic infection from Taenia solium larvae. Use it when documentation specifies muscle involvement rather than another tissue site.
Clinical signs
Clinical features vary; refer to documentation. Reported findings may include localized muscle pain, swelling, tenderness, or a palpable mass, with imaging or pathology supporting cysticercal involvement.
When to use this code
Use this code when the provider documents myositis due to cysticercosis, including cases confirmed by imaging, biopsy, or other diagnostic evidence. It is appropriate when the record clearly links the muscle inflammation to cysticercal infection. Check documentation if the site or cause is not explicit.
Do not use for
Do not use B69.81 for nonspecific myositis, muscle pain without confirmed parasitic cause, or cysticercosis in other organs. If the chart does not specify muscle involvement, check documentation.
Coding tip
Code the documented anatomic site and parasite cause exactly as stated, and query the provider if cysticercosis is mentioned without muscle involvement.