A74Other diseases caused by chlamydiae

A74 is the ICD-10-CM diagnosis code for other diseases caused by chlamydiae. It belongs to block A70-A74 (other diseases caused by chlamydiae) and chapter 1 (certain infectious and parasitic diseases). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: A74.0 (conjunctivitis), A74.8 (diseases) and A74.9 (unspecified).

Don't report A74 together with the conditions in its Excludes1 note: neonatal chlamydial conjunctivitis (P39.1), neonatal chlamydial pneumonia (P23.1), Reiter's disease (M02.3-) and sexually transmitted chlamydial diseases (A55-A56).

The conditions in its Excludes2 note aren't part of A74, but may be coded alongside it if the patient has both: chlamydial pneumonia (J16.0).

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