ICD-10 Code H10.409 – Unspecified chronic conjunctivitis, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H10.409 – Unspecified chronic conjunctivitis, unspecified eye
What it is
This code identifies chronic inflammation of the conjunctiva in an unspecified eye when the record does not state the cause or laterality. Use it when the condition is documented as long-lasting but not further specified.
Clinical signs
Typical findings include persistent redness, irritation, tearing, and a foreign-body sensation. Clinical features vary; refer to documentation when the note does not clearly describe the eye involved or the chronic cause.
When to use this code
Use H10.409 when the provider documents chronic conjunctivitis but does not specify right, left, or bilateral eye. It also fits when the chart confirms a chronic conjunctival inflammation and the documentation remains nonspecific. Check documentation if the note suggests an acute process instead.
Do not use for
Do not use this code for acute conjunctivitis or when the provider identifies a more specific chronic conjunctivitis type. Avoid it if laterality is documented and a more precise code is available.
Coding tip
Before coding, verify both chronicity and laterality in the ophthalmology note to avoid defaulting to an unspecified code.