ICD-10 Code H11.43 – Conjunctival Hyperemia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H11.43 – Conjunctival hyperemia
What it is
Conjunctival hyperemia means redness of the conjunctiva from increased blood flow. It is a descriptive eye finding, not a full diagnosis by itself.
Clinical signs
You may see diffuse or localized conjunctival redness, often with irritation or visible vascular engorgement. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents conjunctival hyperemia as the reason for the eye finding or visit. It fits cases where the chart specifically identifies conjunctival redness without a more specific eye disorder.
If the record names an underlying condition, code that condition first when appropriate. Use the documented term and check whether another conjunctival or ocular diagnosis better describes the encounter.
Do not use for
Do not use it for general eye redness without conjunctival involvement. Also avoid it when documentation supports a more specific conjunctival disorder or another cause of redness.
Coding tip
Query the clinician if the record only says “red eye”; H11.43 should be based on explicit documentation of conjunctival hyperemia.