Other sexually transmitted chlamydial diseases (A56) ICD-10-CM
The A56 code range covers other sexually transmitted chlamydial diseases with 13 ICD-10-CM diagnosis codes. 10 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- sexually transmitted diseases due to Chlamydia
- trachomatis
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.
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Codes in the A56 Range 13 codes · 10 billable
- A56 Other sexually transmitted chlamydial diseasesNon-billable
- A56.0 Chlamydial infection of lower genitourinary tractNon-billable
- A56.00 Chlamydial infection of lower genitourinary tract, unspecified
- A56.01 Chlamydial cystitis and urethritis
- A56.02 Chlamydial vulvovaginitis
- A56.09 Other chlamydial infection of lower genitourinary tract
- A56.1 Chlamydial infection of pelviperitoneum and other genitourinary organsNon-billable
- A56.11 Chlamydial female pelvic inflammatory disease
- A56.19 Other chlamydial genitourinary infection
- A56.2 Chlamydial infection of genitourinary tract, unspecified
- A56.3 Chlamydial infection of anus and rectum
- A56.4 Chlamydial infection of pharynx
- A56.8 Sexually transmitted chlamydial infection of other sites
About the A56 Code Range
These sexually transmitted chlamydial infections are grouped by where they occur, including the urinary or genital tract, anus, rectum, and throat.
A56.0 covers the lower urinary and genital tract. Its subdivisions distinguish an unspecified site, bladder and urinary passage infections, vulva and vagina infections, and other infections. A56.1 covers the pelvic lining and other urinary or genital organs, with subdivisions for female pelvic inflammation and other infections. A56.2 identifies an unspecified urinary or genital tract site.
The remaining codes distinguish infection of the anus and rectum, A56.3; the throat, A56.4; and other sites, A56.8.
Questions About This Page
How many billable codes are in the A56 range?
Of the 13 codes in this range, 10 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the A56 range classify?
The range classifies other sexually transmitted chlamydial diseases. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
