ICD-10-CM 2027
ICD-10 code for chronic conjunctivitis nos
From the official ICD-10-CM alphabetic index entry “Conjunctivitis (staphylococcal) (streptococcal) NOS › chronic (nodosa) (petrificans) (phlyctenular)”. Page updated September 29, 2026.
About coding chronic conjunctivitis nos
The ICD-10-CM code for chronic conjunctivitis nos is H10.40 (Unspecified chronic conjunctivitis). The official index lists 6 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on H10.40.
Within H10.4, choose H10.40 (Unspecified chronic conjunctivitis) only when documentation doesn't support a more specific option: chronic giant papillary conjunctivitis (H10.41), simple chronic conjunctivitis (H10.42), chronic follicular conjunctivitis (H10.43), vernal conjunctivitis (H10.44) and other chronic allergic conjunctivitis (H10.45).
To report this condition, pick the subcode that matches the documentation: H10.401 (right eye), H10.402 (left eye), H10.403 (bilateral) and H10.409 (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.
More specific chronic conjunctivitis nos codes (official index)
Common questions about chronic conjunctivitis nos ICD-10 codes
What is the ICD-10 code for chronic conjunctivitis nos?
- H10.40 — Unspecified chronic conjunctivitis (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: H10.45, H10.44, H10.43, H10.41 and others below.
What is the ICD-10 code for allergic chronic conjunctivitis nos?
- H10.45 — Other chronic allergic conjunctivitis.
What is the ICD-10 code for follicular chronic conjunctivitis nos?
- H10.43 — Chronic follicular conjunctivitis (header code; choose a more specific subcode).
What is the ICD-10 code for giant papillary chronic conjunctivitis nos?
- H10.41 — Chronic giant papillary conjunctivitis (header code; choose a more specific subcode).
What is the ICD-10 code for simple chronic conjunctivitis nos?
- H10.42 — Simple chronic conjunctivitis (header code; choose a more specific subcode).
What is the ICD-10 code for vernal chronic conjunctivitis nos?
- H10.44 — Vernal conjunctivitis.
Is H10.40 billable?
- No. H10.40 is a header code. Report one of its more specific subcodes instead.