ICD-10-CM Code For Other Diseases Caused By Chlamydiae: Group Overview

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group A74 includes infections due to Chlamydia species such as chlamydial urethritis, cervicitis, pelvic inflammatory disease related to chlamydia, and chlamydial conjunctivitis, covering genitourinary and ocular presentations. These ICD-10-CM diagnosis codes are used to document specific clinical scenarios including organism-specific infection, site of involvement, and associated complications to capture disease severity and clinical complexity. Accurate coding within the ICD-10-CM A74 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

Customize your policy alerts

Sign up for ICD-10-CM Code For Other Diseases Caused By Chlamydiae: Group Overview policy alerts

Get alerted when relevant policies change without checking for updates manually.

Monitor payer policy activity

Receive email alerts as soon as relevant payer policies are published or updated.

ICD-10-CM A74: Other Diseases Caused By Chlamydiae Overview

The diagnoses in this group represent infections caused by Chlamydia species that affect genitourinary, ocular, and other body sites. These codes capture conditions such as chlamydial urethritis, cervicitis, salpingitis, and conjunctivitis, reflecting organism-specific infectious disease processes. Accurate coding is important for clinical tracking, public health reporting, and appropriate reimbursement through clear documentation of diagnosis and severity.

When to Use

Use a code from this group when a clinician documents a confirmed or suspected infection due to Chlamydia species with specification of the site of infection. Codes in this group are selected to reflect the documented clinical syndrome, site involvement, and any noted complications.

ICD-10-CM Codes

4 rows

ICD-10-CM Code	Description
A74.0	Chlamydial conjunctivitis
A74.81	Chlamydial peritonitis
A74.89	Other chlamydial diseases
A74.9	Chlamydial infection, unspecified

DRG Codes

4 rows

DRG Code	Description
124	Other Disorders of the Eye with MCC or Thrombolytic Agent
125	Other Disorders of the Eye without MCC
865	Viral Illness with MCC
866	Viral Illness without MCC

Typical Clinical Scenarios

A sexually active adult presents to the urgent care clinic with acute onset of purulent urethral discharge, dysuria, and penile irritation after recent unprotected intercourse. Empiric testing (nucleic acid amplification) returns positive for a non-gonococcal chlamydial infection involving the urethra, prompting diagnosis and short-term antimicrobial therapy. Typical codes: A74.0.
An HIV-positive woman attends a routine gynecology follow-up for persistent lower abdominal pain, intermittent mucopurulent cervical discharge, and confirmed pelvic inflammatory disease on pelvic exam and ultrasound; chlamydial testing identifies a chronic or recurrent chlamydial cervical infection contributing to ongoing pelvic inflammation. Because this is a continuing genital tract chlamydial infection with pelvic complications, a code from this group is assigned to capture the causative organism. Typical codes: A74.81, A74.0.
An adult patient is admitted from the emergency department with high fever, productive cough, and radiographic evidence of community-acquired pneumonia; respiratory PCR identifies Chlamydia species as the etiologic agent. The acute respiratory infection due to chlamydiae is coded from this group to indicate the organism-specific cause of the pneumonia. Typical codes: A74.89, A74.9.

Related Codes

A70-CHLAMYDIA-PSITTACI-INFECTIONS

ICD-10-CM Code For Chlamydia Psittaci Infections: Group Overview

A71-TRACHOMA

ICD-10-CM Code For Trachoma: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.

Explore openpayer tools

View all tools

When to Use

ICD-10-CM Codes

4 rows

ICD-10-CM Code	Description
A74.0	Chlamydial conjunctivitis
A74.81	Chlamydial peritonitis
A74.89	Other chlamydial diseases
A74.9	Chlamydial infection, unspecified

DRG Codes

4 rows

DRG Code	Description
124	Other Disorders of the Eye with MCC or Thrombolytic Agent
125	Other Disorders of the Eye without MCC
865	Viral Illness with MCC
866	Viral Illness without MCC

Typical Clinical Scenarios

A sexually active adult presents to the urgent care clinic with acute onset of purulent urethral discharge, dysuria, and penile irritation after recent unprotected intercourse. Empiric testing (nucleic acid amplification) returns positive for a non-gonococcal chlamydial infection involving the urethra, prompting diagnosis and short-term antimicrobial therapy. Typical codes: A74.0.
An HIV-positive woman attends a routine gynecology follow-up for persistent lower abdominal pain, intermittent mucopurulent cervical discharge, and confirmed pelvic inflammatory disease on pelvic exam and ultrasound; chlamydial testing identifies a chronic or recurrent chlamydial cervical infection contributing to ongoing pelvic inflammation. Because this is a continuing genital tract chlamydial infection with pelvic complications, a code from this group is assigned to capture the causative organism. Typical codes: A74.81, A74.0.
An adult patient is admitted from the emergency department with high fever, productive cough, and radiographic evidence of community-acquired pneumonia; respiratory PCR identifies Chlamydia species as the etiologic agent. The acute respiratory infection due to chlamydiae is coded from this group to indicate the organism-specific cause of the pneumonia. Typical codes: A74.89, A74.9.

Related Codes

A70-CHLAMYDIA-PSITTACI-INFECTIONS

ICD-10-CM Code For Chlamydia Psittaci Infections: Group Overview

A71-TRACHOMA

ICD-10-CM Code For Trachoma: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-CM Code For Other Diseases Caused By Chlamydiae: Group Overview

Sign up for ICD-10-CM Code For Other Diseases Caused By Chlamydiae: Group Overview policy alerts

ICD-10-CM A74: Other Diseases Caused By Chlamydiae Overview

ICD-10-CM Code For Other Diseases Caused By Chlamydiae: Group Overview

Sign up for ICD-10-CM Code For Other Diseases Caused By Chlamydiae: Group Overview policy alerts

ICD-10-CM A74: Other Diseases Caused By Chlamydiae Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which conditions are included in ICD-10-CM code group `A74`?

What specific ICD-10-CM codes are in the A74 group?

How does accurate coding within `A74` support reimbursement?

Which DRGs are related to the `A74` code group?

For what purposes beyond reimbursement is accurate `A74` coding important?

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which conditions are included in ICD-10-CM code group `A74`?

What specific ICD-10-CM codes are in the A74 group?

How does accurate coding within `A74` support reimbursement?

Which DRGs are related to the `A74` code group?

For what purposes beyond reimbursement is accurate `A74` coding important?

References