ICD-10 Code B91 – Sequelae of poliomyelitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B91 – Sequelae of poliomyelitis
What it is
B91 identifies late effects that remain after a prior poliomyelitis infection. Use it when the current problem is a residual condition, not an active polio infection.
Clinical signs
Clinical features vary; refer to documentation. Common residual findings may include muscle weakness, paralysis, deformity, or other long-term neurologic deficits after past poliomyelitis.
When to use this code
Use B91 when the record clearly states sequelae, late effects, or residuals of poliomyelitis. The original infection is no longer active, but the lasting impairment is still being treated or evaluated. Code the residual condition as well when documented separately.
Do not use for
Do not use B91 for active poliomyelitis infection or for unrelated neuromuscular weakness without a documented polio history. Check documentation if the cause of the deficit is unclear.
Coding tip
Assign B91 only when the provider links the current deficit to prior poliomyelitis.