MCMedicalCodingSoftware
A74.9

A74.9: Chlamydial infection, unspecified

Billable / specific codeICD-10-CM

A74.9 is a billable, specific ICD-10-CM code for chlamydial infection, unspecified. It is valid for submission on a claim.

Check A74.9 with the rest of the claim: free scrubber

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

  • Chlamydiosis NOS

Excludes1 inherited from the categories above A74.9

A category’s note binds every code beneath it.

Written on A74: Other diseases caused by chlamydiae

  • neonatal chlamydial conjunctivitis (P39.1)
  • neonatal chlamydial pneumonia (P23.1)
  • Reiter's disease (M02.3-)
  • sexually transmitted chlamydial diseases (A55-A56)

Excludes2 inherited from the categories above A74.9

Not part of this code, but both may be coded when both are present.

Written on A74: Other diseases caused by chlamydiae

  • chlamydial pneumonia (J16.0)

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Alphabetic index entries that lead here

  • Chlamydia, chlamydial
  • Disease, diseased›chlamydial
  • Infection, infected, infective›Chlamydia, chlamydial

Code history

Unchanged in every release from FY2024 to FY2027.

Other codes under A74

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.