Other diseases caused by chlamydiae (A70-A74) ICD-10-CM
The A70–A74 section covers other diseases caused by chlamydiae with 11 ICD-10-CM diagnosis codes, of which 8 are billable in fiscal year 2027. The section is organized into the 3 code ranges listed below.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Code Ranges in This Section 3 ranges · 11 codes
| Code Range | Title | Codes | Billable |
|---|---|---|---|
| A70 | Chlamydia psittaci infections (A70) | 1 | 1 |
| A71 | Trachoma (A71) | 4 | 3 |
| A74 | Other diseases caused by chlamydiae (A74) | 6 | 4 |
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the A70–A74 Code Range
These chlamydial diseases include an infection passed from infected birds and trachoma, a long-lasting infection of the eye’s surface lining and clear front layer.
A70 identifies Chlamydia psittaci infections, also called psittacosis. People acquire this infection by breathing dust contaminated with secretions or excreta from infected birds. A71 separates trachoma by initial stage, active stage, or unspecified stage. A74 separates chlamydial conjunctivitis, other chlamydial diseases, and unspecified chlamydial infection.
Questions About This Page
How many codes are in the A70-A74 range?
The A70-A74 range contains 11 ICD-10-CM diagnosis codes in FY 2027. 8 of them are billable, and the rest are category headers that organize the section.
What conditions does A70-A74 cover?
The range covers other diseases caused by chlamydiae. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
