ICD-10 Code H21.1X3 – Other vascular disorders of iris and ciliary body, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.1X3 – Other vascular disorders of iris and ciliary body, bilateral
What it is
This code identifies a vascular disorder affecting both the iris and ciliary body. Use it when the record specifies bilateral involvement and the condition is not better described by a more specific diagnosis.
Clinical signs
Findings may include abnormal blood vessel changes in the iris or ciliary body, with clinical features varying by cause. Check documentation for evidence of bilateral disease and the exact ophthalmic description.
When to use this code
Use H21.1X3 when the provider documents a bilateral vascular disorder of the iris and ciliary body and does not name a different, more specific condition. It is appropriate for ophthalmology notes, consults, or problem lists that clearly state both eyes are involved.
If the chart only mentions one eye, use the laterality that matches the documentation. If the diagnosis is uncertain or described differently, check documentation before assigning this code.
Do not use for
Do not use this code for unilateral disease, nonspecific eye redness, or unrelated retinal vascular disorders. If the disorder is better classified elsewhere, choose the more specific code.
Coding tip
Verify laterality in the ophthalmology note; H21.1X3 requires bilateral documentation.