2026 ICD-10-CM Diagnosis Code A56Other sexually transmitted chlamydial diseases
A56 is a non-billable ICD-10-CM category code for other sexually transmitted chlamydial diseases, so it cannot be submitted on claims. Use a more specific code from this category instead, such as A56.00, A56.01, A56.02, and A56.09.
Code Identity
Code Classification
Specific Coding for Other sexually transmitted chlamydial diseasesOverview
Non-specific codes like A56 require more characters. Use one of these billable codes instead:
A56.0 for Chlamydial infection of lower genitourinary tract
Use A56.00 for Chlamydial infection of lower genitourinary tract, unspecified
Use A56.01 for Chlamydial cystitis and urethritis
Use A56.02 for Chlamydial vulvovaginitis
Use A56.09 for Other chlamydial infection of lower genitourinary tract
A56.1 for Chlamydial infection of pelviperitoneum and other genitourinary organs
Use A56.11 for Chlamydial female pelvic inflammatory disease
Use A56.19 for Other chlamydial genitourinary infection
Use A56.2 for Chlamydial infection of genitourinary tract, unspecified
Use A56.3 for Chlamydial infection of anus and rectum
Use A56.4 for Chlamydial infection of pharynx
Use A56.8 for Sexually transmitted chlamydial infection of other sites
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Includes
- sexually transmitted diseases due to Chlamydia
- trachomatis
Type 1 Excludes
Type 2 Excludes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
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.
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.
Patient EducationClinical
Chlamydia Infections
Chlamydia is a common sexually transmitted infection (STI). It is caused by bacteria called Chlamydia trachomatis. Anyone can get chlamydia. It often doesn't cause symptoms, so people may not know that they have it. Antibiotics can cure it. But if it's not treated, chlamydia can cause serious health problems.
The full article covers:
- What is chlamydia?
- How is chlamydia spread?
- Who is more likely to get chlamydia?
- What are the symptoms of chlamydia?
- How is chlamydia diagnosed?
- Who should be tested for chlamydia?
- What other problems can chlamydia cause?
- What are the treatments for chlamydia?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Code HistoryHistory
Questions About A56Overview
Is A56 (Other sexually transmitted chlamydial diseases) a billable code?
No. This is a category header that groups the codes for other sexually transmitted chlamydial diseases, and headers cannot be submitted on claims. Claims for other sexually transmitted chlamydial diseases need a more specific code from this category, such as A56.00, A56.01, and A56.02.
