ICD-10-CM 2027 diagnosis code

A74.8Other chlamydial diseases

Not billable — use a more specific code

A74.8 is a header code, so it can't be reported by itself. Choose one of the 2 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About A74.8

A74.8 is the ICD-10-CM diagnosis code for other chlamydial diseases. It belongs to category A74 (other diseases caused by chlamydiae), 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 2 subcodes must be used instead.

Within A74, choose A74.8 (Other chlamydial diseases) only when documentation doesn't support a more specific option: chlamydial conjunctivitis (A74.0) and chlamydial infection, unspecified (A74.9).

To report this condition, pick the subcode that matches the documentation: A74.81 (peritonitis) and A74.89 (diseases).

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

Specific codes under A74.8

Notes that apply from higher levels

Instructions written at a parent level also apply to A74.8.

› From A74 Other diseases caused by chlamydiae

Excludes1

neonatal chlamydial conjunctivitis (P39.1)
neonatal chlamydial pneumonia (P23.1)
Reiter's disease (M02.3-)
sexually transmitted chlamydial diseases (A55-A56)

Excludes2

chlamydial pneumonia (J16.0)

Broader instructions also apply from A70-A74 Other diseases caused by chlamydiae and Chapter 1: Certain infectious and parasitic diseases.

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about A74.8

Is A74.8 billable?: No. A74.8 is a header code. Report one of its more specific subcodes instead.