ICD-10 Code H20.042 – Secondary noninfectious iridocyclitis, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H20.042 – Secondary noninfectious iridocyclitis, left eye
What it is
This code identifies inflammation of the iris and ciliary body in the left eye that is secondary to another noninfectious cause. Use it when documentation links the iridocyclitis to an underlying condition or trigger.
Clinical signs
Typical findings include eye pain, redness, photophobia, and blurred vision. Clinical features vary; refer to documentation for evidence of anterior uveitis or a secondary inflammatory process.
When to use this code
Use H20.042 when the provider documents secondary noninfectious iridocyclitis affecting the left eye. The record should support both the laterality and the noninfectious secondary nature of the condition. If the cause is stated, code the underlying condition when required by documentation guidelines.
Do not use for
Do not use this code for infectious uveitis or for iridocyclitis without a documented secondary cause. Check documentation if the eye involved is not the left eye.
Coding tip
Confirm laterality and whether the iridocyclitis is secondary before assigning H20.042.