ICD-10 Code H20.0 – Acute and subacute iridocyclitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H20.0 – Acute and subacute iridocyclitis
What it is
H20.0 identifies acute or subacute inflammation of the iris and ciliary body. Use it when the record describes a recent, active iridocyclitis episode rather than a chronic or unspecified uveitis.
Clinical signs
Typical findings include eye pain, redness, photophobia, and blurred vision. Clinical features vary; refer to documentation for signs such as ciliary flush, small pupil, or anterior chamber inflammation.
When to use this code
Use H20.0 when the provider documents acute or subacute iridocyclitis, anterior uveitis, or inflammation limited to the iris and ciliary body. It fits encounters focused on the current episode, including evaluation and follow-up. Check documentation if the note only says “uveitis” without acuity.
Do not use for
Do not use this code for chronic iridocyclitis, unspecified uveitis, or eye pain without confirmed inflammation. If the condition is due to another documented cause, code the underlying diagnosis as directed.
Coding tip
Confirm the acuity term in the provider note before assigning H20.0; if acuity is missing, check documentation.