A56
ICD-10Non-billable categoryOther sexually transmitted chlamydial diseases
Official ICD-10-CM descriptor (FY2026)
Other sexually transmitted chlamydial diseases
A56 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
Includes
- sexually transmitted diseases due to Chlamydia
- trachomatis
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- neonatal chlamydial conjunctivitis (P39.1)
- neonatal chlamydial pneumonia (P23.1)
Excludes2
Not included here. The condition is not part of this code, but a patient may have both, and both codes may be reported together.
- chlamydial lymphogranuloma (A55)
- conditions classified to A74.-
More specific codes under A56
- A56.0Chlamydial infection of lower genitourinary tractcategory
- A56.1Chlamydial infection of pelviperitoneum and oth GU organscategory
- A56.2Chlamydial infection of genitourinary tract, unspecified
- A56.3Chlamydial infection of anus and rectum
- A56.4Chlamydial infection of pharynx
- A56.8Sexually transmitted chlamydial infection of other sites
Where this code sits
Krasyn Codes for Chrome
Review coding suggestions beside a validated web workflow. Private pilot.
Request pilot accessSource
ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.