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 2026. 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
The ICD-10 codes from A70 to A74 cover various diseases caused by chlamydiae bacteria, including infections like psittacosis, trachoma, conjunctivitis, and other chlamydial conditions. These codes help specify different chlamydial infections affecting the eyes, respiratory system, and other body areas.
This range includes A70 for Chlamydia psittaci infections, also known as psittacosis or ornithosis, a bacterial infection often linked to bird exposure that can cause pneumonia. Codes A71.0, A71.1, and A71.9 detail stages of trachoma, a contagious eye disease that can lead to blindness. The A74 group addresses other chlamydial diseases, such as A74.0 for chlamydial conjunctivitis (inflammation of the eye’s conjunctiva), and A74.81 for chlamydial peritonitis, linked to Fitz-Hugh-Curtis syndrome. Additionally, A74.89 covers less common infections like chlamydial colitis and neonatal infections, while A74.9 is used for unspecified chlamydial infections. These codes provide precise classification for bacterial chlamydial diseases affecting different organs and stages, aiding accurate diagnosis and treatment documentation.
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 2026. 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 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
