A74.9 – Chlamydial infection, unspecified

ICD-10-CM 2027 diagnosis code · Other diseases caused by chlamydiae

Billable code

ICD-10-CM code A74.9
Code
A74.9 (claims format: A749)
Description
Chlamydial infection, unspecified
Billable
Yes – valid for HIPAA-covered transactions
Valid for
Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter
1. Certain infectious and parasitic diseases (A00-B99)
Block
A70-A74 Other diseases caused by chlamydiae
Parent codes
A74

Notes for A74.9

Applicable to:
  • Chlamydiosis NOS

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

A74 – Other diseases caused by chlamydiae

Excludes1 (not coded here):
  • 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)

Block A70-A74

Excludes1 (not coded here):
  • sexually transmitted chlamydial diseases (A55-A56)

Index terms for A74.9

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in A74

Frequently asked questions

What is ICD-10 code A74.9?

A74.9 is the ICD-10-CM code for chlamydial infection, unspecified, in the block A70-A74 (Other diseases caused by chlamydiae).

Is A74.9 a billable code?

Yes. A74.9 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does A74.9 belong to?

It belongs to category A74 – Other diseases caused by chlamydiae.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.