ICD-10 Code H16.20 – Unspecified keratoconjunctivitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.20 – Unspecified keratoconjunctivitis
What it is
Use this code for keratoconjunctivitis when the cornea and conjunctiva are inflamed, but the specific cause or type is not documented. It signals an unspecified diagnosis rather than a more detailed subtype.
Clinical signs
Typical findings may include eye redness, irritation, tearing, foreign-body sensation, and light sensitivity. Clinical features vary; refer to documentation.
When to use this code
Use H16.20 when the record documents keratoconjunctivitis but does not identify an exact etiology, such as allergic, viral, or other specified forms. It is also appropriate when the provider notes inflammation of both cornea and conjunctiva without further detail. Check documentation if laterality or cause is recorded elsewhere.
Do not use for
Do not use this code if the chart specifies a different keratoconjunctivitis type or a separate corneal or conjunctival disorder alone. Do not assign it when documentation supports a more specific diagnosis.
Coding tip
If the note is vague, query for the exact type before defaulting to an unspecified code.