ICD-10 Code B26.0 – Mumps orchitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B26.0 – Mumps orchitis
What it is
B26.0 identifies orchitis caused by mumps infection. Use it when the testicle is inflamed as a complication of mumps, usually in an adolescent or adult male with active or recent parotitis.
Clinical signs
Typical findings include testicular pain, swelling, tenderness, and sometimes fever or concurrent parotid gland swelling. Clinical features vary; refer to documentation.
When to use this code
Use B26.0 when the provider documents mumps orchitis, mumps-related testicular inflammation, or orchitis due to mumps. Code the condition only when the mumps etiology is stated or clearly documented. If the record does not link orchitis to mumps, check documentation.
Do not use for
Do not use this code for orchitis from other infectious causes, trauma, or unspecified testicular pain. Do not assign it when mumps is absent or not documented as the cause.
Coding tip
Confirm both the orchitis and the mumps cause in the provider note before assigning B26.0.