H10.3Unspecified acute conjunctivitis

H10.3 is the ICD-10-CM diagnosis code for unspecified acute conjunctivitis. It belongs to category H10 (conjunctivitis), block H10-H11 (disorders of conjunctiva) and chapter 7 (diseases of the eye and adnexa). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

Within H10, choose H10.3 (Unspecified acute conjunctivitis) only when documentation doesn't support a more specific option: mucopurulent conjunctivitis (H10.0), acute atopic conjunctivitis (H10.1), other acute conjunctivitis (H10.2), chronic conjunctivitis (H10.4), blepharoconjunctivitis (H10.5), other conjunctivitis (H10.8) and unspecified conjunctivitis (H10.9).

To report this condition, pick the subcode that matches the documentation: H10.30 (unspecified eye), H10.31 (right eye), H10.32 (left eye) and H10.33 (bilateral).

Don't report H10.3 together with the conditions in its Excludes1 note: ophthalmia neonatorum NOS (P39.1).

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