A74
Other diseases caused by chlamydiae
A74 is a non-billable ICD-10-CM code category for other diseases caused by chlamydiae. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are A74.0 Chlamydial conjunctivitis; A74.8 Other chlamydial diseases and A74.9 Chlamydial infection, unspecified. Its coding notes include a Use additional code instruction, 5 Excludes1 entries and 6 Excludes2 entries.
Use additional code
Add the listed code as a secondary code, if known.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Also from chapter/block level (1 note)
- sexually transmitted chlamydial diseases (A55-A56)
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
- chlamydial pneumonia (J16.0)
Also from chapter/block level (5 notes)
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
Includes
Further defines or gives examples of the content of the category.
Also from chapter/block level (1 note)
- diseases generally recognized as communicable or transmissible