ICD-10-CM
ICD-10 code for Chlamydia: A74.9
The ICD-10-CM index points "Chlamydia" to A74 (Other diseases caused by chlamydiae), a header that is not billable. When nothing more specific is documented, the billable code is A74.9, Chlamydial infection, unspecified.
Source: CDC ICD-10-CM FY2027 Alphabetic Index file dated June 16, 2026. Publisher page
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Index subterms
A header groups codes and is not billed. A billable code is one you can report.
- A56.09cervicitis, Other chlamydial infection of lower genitourinary tractBillable
- A74.0conjunctivitis, Chlamydial conjunctivitisBillable
- A56.01cystitis, Chlamydial cystitis and urethritisBillable
- A56.11endometritis, Chlamydial female pelvic inflammatory diseaseBillable
- A56.19epididymitis, Other chlamydial genitourinary infectionBillable
- A56.19orchitis, Other chlamydial genitourinary infectionBillable
- A74.81peritonitis, Chlamydial peritonitisBillable
- A56.4pharyngitis, Chlamydial infection of pharynxBillable
- A56.3proctitis, Chlamydial infection of anus and rectumBillable
- A70psittaci (infection), Chlamydia psittaci infectionsBillable
- A56.11salpingitis, Chlamydial female pelvic inflammatory diseaseBillable
- A56.8sexually-transmitted infection NEC, Sexually transmitted chlamydial infection of other sitesBillable
- A74.89specified NEC, Other chlamydial diseasesBillable
- A56.01urethritis, Chlamydial cystitis and urethritisBillable
- A56.02vulvovaginitis, Chlamydial vulvovaginitisBillable
More specific codes in A74
A header groups codes and is not billed. A billable code is one you can report.
Excludes1
Excludes1 means these codes are not reported together.
From A74. A note on a category applies to every code under it.
Excludes2
Excludes2 means the other condition can be reported with this one when both are documented.
From A74. A note on a category applies to every code under it.
Related conditions
Related pages
- A74.9 code detailsNotes, nearby codes, CMS-HCC group
- Category A74Every code under it
- Chapter 1Certain infectious and parasitic diseases
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Chlamydia?
The ICD-10-CM index points "Chlamydia" to A74 (Other diseases caused by chlamydiae), a header that is not billable. When nothing more specific is documented, the billable code is A74.9, Chlamydial infection, unspecified.
Is A74.9 billable?
Yes. A74.9 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to A74.9?
The CDC tabular list gives 4 Excludes1 notes (not coded together), 1 Excludes2 note (may be coded together when both are documented) for A74.9 and the categories above it. They are listed on this page.
What chapter is A74.9 in?
Chapter 1. Certain infectious and parasitic diseases.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.