H10.21Acute toxic conjunctivitis

H10.21 is the ICD-10-CM diagnosis code for acute toxic 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 H10.2 (other acute conjunctivitis), H10.21 is specifically for acute toxic conjunctivitis. Related codes cover Pseudomembranous conjunctivitis (H10.22) and serous conjunctivitis, except viral (H10.23).

To report this condition, pick the subcode that matches the documentation: H10.211 (right eye), H10.212 (left eye), H10.213 (bilateral) and H10.219 (unspecified eye).

Don't report H10.21 together with the conditions in its Excludes1 note: burn and corrosion of eye and adnexa (T26.-).

Code first: (T51-T65) to identify chemical and intent.

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