A74.0 ICD-10-CM Code: Chlamydial conjunctivitis
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FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Other diseases caused by chlamydiae (A70-A74)
A74.0
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceChlamydial conjunctivitis
This is an eye infection caused by chlamydia bacteria that affects the conjunctiva, the clear membrane covering the white part of the eye and inner eyelids. It causes redness, discharge, and irritation of the eye.
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
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Code Book Path
Inclusion Terms
Official- Paratrachoma
Excludes 2
Official- chlamydial pneumonia (J16.0)
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for A74.0 in this effective period.
Excludes 1
Official- neonatal chlamydial conjunctivitis (P39.1)
- neonatal chlamydial pneumonia (P23.1)
- Reiter's disease (M02.3-)
- sexually transmitted chlamydial diseases (A55-A56)
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A74.0 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A74.0 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A74.0 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 A74.0 an HCC code?
No. A74.0 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
A74.0 is the ICD-10-CM diagnosis code for chlamydial conjunctivitis. This is an eye infection caused by chlamydia bacteria that affects the conjunctiva, the clear membrane covering the white part of the eye and inner eyelids. It causes redness, discharge, and irritation of the eye. A74.0 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).
A74.0 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.
Verify whether the infection is in one eye (unilateral) or both eyes (bilateral), as this may affect documentation and treatment approach.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A74.0 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify whether the infection is in one eye (unilateral) or both eyes (bilateral), as this may affect documentation and treatment approach
- •Distinguish between chlamydial conjunctivitis in newborns (neonatal ophthalmia) versus adults, as A74.0 typically refers to adult cases; neonatal cases use different codes (P39.1)