ICD-10 Code H10.422 – Simple chronic conjunctivitis, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H10.422 – Simple chronic conjunctivitis, left eye
What it is
H10.422 identifies chronic, noninfectious-appearing inflammation of the conjunctiva in the left eye. Use it when the record specifies simple chronic conjunctivitis affecting that eye.
Clinical signs
Typical findings include persistent conjunctival redness, irritation, and possible mild discharge or tearing. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents chronic conjunctivitis limited to the left eye and does not describe a more specific type. It is appropriate for ongoing follow-up visits, problem-list entries, or assessments that clearly identify the left eye. Check documentation if the cause or subtype is unclear.
Do not use for
Do not use this code for acute conjunctivitis, allergic conjunctivitis, or conjunctivitis of the right eye or both eyes. If the note specifies another etiology or laterality, choose the documented code.
Coding tip
Verify laterality and chronicity in the assessment before assigning H10.422.