A74.9

Billable

ChapterA00–B99

Ranksubcategory

Official Description

Chlamydial infection, unspecified

Metadata & Insights

•2026 ICD-10-CM Edition - Effective October 1, 2025.
•Billable/specific code (valid for reimbursement).
•Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99).

Instructional Notes

Includes

Chlamydiosis NOS

General instructions are available for the parent sections:

View CH1 Notes View A70-A74 Notes View A74 Notes

Clinical Hierarchy

CH1Certain infectious and parasitic diseases (A00-B99)

A70-A74Other diseases caused by chlamydiae (A70-A74)

A74Other diseases caused by chlamydiae

A74.9Chlamydial infection, unspecified

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to A74.9:

categoryA74

Other diseases caused by chlamydiae

View context instructions

blockA70-A74

Other diseases caused by chlamydiae (A70-A74)

View context instructions

chapterCH1

Certain infectious and parasitic diseases (A00-B99)

View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to A74.9. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

3 raw paths

Chlamydia, chlamydial1 unique routes

Direct index entry→A74.9

Disease, diseased1 unique routes

chlamydial→A74.9

Infection, infected, infective (opportunistic)1 unique routes

Chlamydia, chlamydial→A74.9

MS-DRG Classification

2026 v43.1

This code is grouped within the following Diagnosis Related Group(s) for clinical reimbursement:

DRG 865

Viral Illness with MCC

DRG 866

Viral Illness without MCC

Cross Reference

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