A56.8 ICD-10-CM Code: Sexually transmitted chlamydial infection of other sites
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Infections with a predominantly sexual mode of transmission (A50-A64)
A56.8
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceSexually transmitted chlamydial infection of other sites
A bacterial infection caused by chlamydia that affects areas of the body other than the genital tract, urethra, cervix, or rectum. This includes chlamydial infections of sites such as the conjunctiva (eye), pharynx (throat), or other mucous membranes.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
00
RAF 0
Code Trumping
Basket needed
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for A56.8 in this effective period.
Excludes 2
Official- chlamydial lymphogranuloma (A55)
- conditions classified to A74.-
Related Child Codes
Includes
Official- sexually transmitted diseases due to Chlamydia
- trachomatis
Excludes 1
Official- neonatal chlamydial conjunctivitis (P39.1)
- neonatal chlamydial pneumonia (P23.1)
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A56.8 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A56.8 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A56.8 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is A56.8 an HCC code?
No. A56.8 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
A56.8 is the ICD-10-CM diagnosis code for sexually transmitted chlamydial infection of other sites. A bacterial infection caused by chlamydia that affects areas of the body other than the genital tract, urethra, cervix, or rectum. This includes chlamydial infections of sites such as the conjunctiva (eye), pharynx (throat), or other mucous membranes. A56.8 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering infections with a predominantly sexual mode of transmission (a50-a64).
A56.8 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Always verify the specific anatomical site of infection in the documentation, as this may require an additional site-specific code or laterality designation depending on the location affected.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A56.8 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Always verify the specific anatomical site of infection in the documentation, as this may require an additional site-specific code or laterality designation depending on the location affected
- •Ensure the infection is confirmed as sexually transmitted chlamydia (A56.x category) rather than non-sexually transmitted chlamydial infections (A74.x category) to select the correct code