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ICD-10-CM 2027

ICD-10 code for exposure keratoconjunctivitis

H16.21

Exposure keratoconjunctivitis

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Keratoconjunctivitis › exposure”. Page updated September 29, 2026.

About coding exposure keratoconjunctivitis

The ICD-10-CM code for exposure keratoconjunctivitis is H16.21 (Exposure keratoconjunctivitis).

Within H16.2 (keratoconjunctivitis), H16.21 is specifically for exposure keratoconjunctivitis. Related codes cover unspecified keratoconjunctivitis (H16.20), sicca, not specified as Sjogren's (H16.22), Neurotrophic keratoconjunctivitis (H16.23), Ophthalmia nodosa (H16.24), Phlyctenular keratoconjunctivitis (H16.25), vernal keratoconjunctivitis, with limbar and corneal involvement (H16.26) and other keratoconjunctivitis (H16.29).

To report this condition, pick the subcode that matches the documentation: H16.211 (right eye), H16.212 (left eye), H16.213 (bilateral) and H16.219 (unspecified eye).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Common questions about exposure keratoconjunctivitis ICD-10 codes

What is the ICD-10 code for exposure keratoconjunctivitis?

H16.21 — Exposure keratoconjunctivitis (a header code; report a more specific subcode).

Is H16.21 billable?

No. H16.21 is a header code. Report one of its more specific subcodes instead.