ICD-10 Code H10.40 – Unspecified chronic conjunctivitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H10.40 – Unspecified chronic conjunctivitis
What it is
Use this code for chronic inflammation of the conjunctiva when the record does not identify a specific type, cause, or laterality. It indicates a long-lasting conjunctival condition, but the documentation is nonspecific.
Clinical signs
Typical findings may include persistent red eye, irritation, tearing, or discharge. Clinical features vary; refer to documentation if the note does not clearly describe chronic conjunctival inflammation.
When to use this code
Use H10.40 when the provider documents chronic conjunctivitis without naming an infectious, allergic, or other specific subtype. It is also appropriate when the chart confirms chronic conjunctival inflammation but lacks further detail. Check documentation if laterality or cause is stated elsewhere.
Do not use for
Do not use this code for acute conjunctivitis, allergic conjunctivitis, or any clearly specified chronic subtype. If the record identifies a more precise diagnosis, code that instead.
Coding tip
Query for the cause and laterality when the note says only “conjunctivitis,” because a more specific code may be available.