A74.9 Chlamydial infection, unspecified

Billable ICD-10-CM code, FY2026.

Applicable to

• Chlamydiosis NOS

Applies from A74 Other diseases caused by chlamydiae

Excludes1 (never code together)

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

Excludes2 (not included here)

• chlamydial pneumonia (J16.0)

MS-DRG index

Defines the logic of DRG(s) 865-866 in MDC 18.

Approximate ICD-9-CM (GEMs)

• 079.98 Unspecified chlamydial infection (approximate)

Code annotations containing back-references to A74.9

Back-references to A74.9

• Type 1 Excludes: A49 Bacterial infection of unspecified site ("chlamydial infection NOS (A74.9)")

Back-references to A74

• Type 2 Excludes: A56 Other sexually transmitted chlamydial diseases ("conditions classified to A74.-")

Diagnosis Index entries for A74.9

• Chlamydia, chlamydial
• Disease, diseased › chlamydial
• Infection, infected, infective (opportunistic) › Chlamydia, chlamydial

Nearby codes

• A74 Other diseases caused by chlamydiae
• A74.0 Chlamydial conjunctivitis
• A74.8 Other chlamydial diseases
• A74.81 Chlamydial peritonitis
• A74.89 Other chlamydial diseases
• A74.9 Chlamydial infection, unspecified (this code)