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 2026, 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
The ICD-10 code A56 covers various sexually transmitted chlamydial diseases affecting different parts of the genitourinary and other related systems. These codes specify infections caused by Chlamydia trachomatis, which can involve the lower genitourinary tract, pelvic organs, anus, pharynx, and other sites.
Codes within the A56 category distinguish between infections such as chlamydial cystitis and urethritis (A56.01), chlamydial vulvovaginitis (A56.02), and female pelvic inflammatory disease caused by Chlamydia (A56.11). For example, terms like "chlamydial urethritis" or "Chlamydia trachomatis infection of genital structure" are synonyms that link back to these specific codes. The code A56.3 identifies chlamydial infection of the anus and rectum, while A56.4 covers chlamydial pharyngitis. Unspecified or other site infections are classified under A56.00, A56.09, A56.19, and A56.8. Medical coders use these precise codes to document infections transmitted sexually by Chlamydia trachomatis affecting different anatomical locations, assisting in accurate diagnosis and treatment tracking.
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, 2025 through September 30, 2026. 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 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
