ICD-10 Code H10.402 – Unspecified chronic conjunctivitis, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H10.402 – Unspecified chronic conjunctivitis, left eye
What it is
This code identifies chronic inflammation of the conjunctiva in the left eye when the specific cause is not documented. It is used for a persistent, nonspecific conjunctival condition affecting only the left eye.
Clinical signs
Common findings may include redness, irritation, tearing, discharge, or a chronic foreign-body sensation. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record states chronic conjunctivitis and specifies the left eye, but does not identify an organism, allergic trigger, or other cause. It also fits when the provider documents a longstanding conjunctival inflammation without further detail.
If the note describes a different conjunctivitis type, code that more specific diagnosis instead. Check documentation when laterality or chronicity is unclear.
Do not use for
Do not use this code for acute conjunctivitis, bilateral disease, or conjunctivitis with a documented cause such as allergic, viral, or bacterial etiology. Check documentation.
Coding tip
Capture laterality and chronicity exactly as documented, because unspecified and acute conjunctivitis codes are not interchangeable.