ICD-10 Code M06.1 – Adult-onset Still’s disease (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M06.1 – Adult-onset Still’s disease
What it is
M06.1 identifies adult-onset Still’s disease, a systemic inflammatory disorder. You use it for the diagnosis when the provider documents this condition.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include recurrent fever, rash, joint pain, and inflammation affecting multiple organ systems.
When to use this code
Use M06.1 when the record clearly states adult-onset Still’s disease or AOSD. It may also apply when the provider documents a confirmed systemic inflammatory syndrome consistent with this diagnosis. Check documentation if the note is ambiguous or only lists symptoms.
Do not use for
Do not use this code for nonspecific fever, rash, or arthritis without a documented diagnosis. Do not assign it for juvenile-onset Still’s disease or other inflammatory arthritides unless specifically stated.
Coding tip
Code M06.1 only from provider-documented diagnosis; symptom lists alone are not enough.