ICD-10 Code H10.4 – Chronic conjunctivitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H10.4 – Chronic conjunctivitis
What it is
H10.4 identifies chronic inflammation of the conjunctiva, the thin membrane covering the eye and inner eyelid. Use it when the record describes a persistent or recurrent conjunctival condition rather than an acute infection.
Clinical signs
Common findings include long-lasting eye redness, irritation, itching, tearing, or mild discharge. Clinical features vary; refer to documentation for whether the condition is bilateral, recurrent, or associated with another eye disorder.
When to use this code
Use H10.4 when the provider documents chronic conjunctivitis, chronic conjunctival inflammation, or a persistent conjunctival condition without a more specific subtype. It may apply when symptoms have been ongoing over time and the note does not support an acute diagnosis. Check documentation if another cause is named.
Do not use for
Do not use this code for acute conjunctivitis, allergic conjunctivitis, or other specifically documented conjunctival disorders. If the chart identifies a different type or cause, code that condition instead.
Coding tip
Look for the word “chronic” in the assessment and avoid defaulting to H10.4 when the provider names a more specific conjunctivitis type.