ICD-10 Code H20.01 – Primary iridocyclitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H20.01 – Primary iridocyclitis
What it is
Primary iridocyclitis is inflammation of the iris and ciliary body. Use this code when documentation identifies the condition as primary, not secondary or due to another disease.
Clinical signs
Typical findings include eye pain, redness, photophobia, and blurred vision. Clinical features vary; refer to documentation for laterality, acuity, and any exam findings.
When to use this code
Use H20.01 when the provider documents primary iridocyclitis or anterior uveitis without another stated cause. It may appear in ophthalmology notes, problem lists, or encounter diagnoses. If the record links the inflammation to infection, trauma, or systemic disease, check documentation for a different code.
Do not use for
Do not use this code for secondary iridocyclitis or for uveitis with an identified underlying cause. Check documentation if the note describes a broader uveitis diagnosis rather than isolated primary iridocyclitis.
Coding tip
Verify whether the provider specified primary, secondary, or cause-related inflammation before assigning H20.01.