A74.89 ICD-10-CM Code: Other chlamydial diseases
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) / Other diseases caused by chlamydiae (A70-A74)
A74.89
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceOther chlamydial diseases
This code represents chlamydial infections that don't fit into other specific chlamydial disease categories, such as chlamydial infections affecting various body systems or organs. It's used when the chlamydial infection is confirmed but the specific type or location doesn't match more specific chlamydial codes.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for A74.89 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for A74.89 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for A74.89 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for A74.89 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A74.89 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A74.89 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A74.89 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 A74.89 an HCC code?
No. A74.89 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
A74.89 is the ICD-10-CM diagnosis code for other chlamydial diseases. This code represents chlamydial infections that don't fit into other specific chlamydial disease categories, such as chlamydial infections affecting various body systems or organs. It's used when the chlamydial infection is confirmed but the specific type or location doesn't match more specific chlamydial codes. A74.89 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering other diseases caused by chlamydiae (a70-a74).
A74.89 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.
Use this code only after confirming that the chlamydial infection doesn't meet criteria for more specific codes like A74.0 (conjunctivitis), A74.01 (neonatal), or A74.1 (pelvic inflammatory disease).
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A74.89 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only after confirming that the chlamydial infection doesn't meet criteria for more specific codes like A74.0 (conjunctivitis), A74.01 (neonatal), or A74.1 (pelvic inflammatory disease)
- •Always document the specific site or manifestation of the chlamydial infection in the medical record to support accurate coding and ensure the most specific code is selected