ICD-10 Code H10.429 – Simple chronic conjunctivitis, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H10.429 – Simple chronic conjunctivitis, unspecified eye
What it is
This code identifies long-standing conjunctival inflammation in an unspecified eye. It is used when documentation confirms chronic simple conjunctivitis but does not specify left, right, or bilateral involvement.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include persistent conjunctival redness, irritation, tearing, or mild discharge without an acute infectious picture.
When to use this code
Use this code when the provider documents chronic simple conjunctivitis and the affected eye is not specified. It also fits follow-up visits for an established chronic condition when the record still lacks laterality. Check documentation if the note suggests another conjunctival disorder.
Do not use for
Do not use this code for acute conjunctivitis, allergic conjunctivitis, or other specific conjunctival diseases. If the record identifies a left, right, or bilateral eye, code the documented laterality instead.
Coding tip
Verify that “chronic” and “simple conjunctivitis” are both documented before assigning H10.429.