ICD-10 Code for Chlamydia
The ICD-10-CM code for chlamydia is A74.9 — Chlamydial infection, unspecified. This is the code the Alphabetic Index gives for chlamydia with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
A74.9 is billable but unspecified. If the documentation names a type, site or cause, one of the more specific codes below is likely expected.
Which chlamydia code should you use?
The Alphabetic Index lists 13 codes under Chlamydia, chlamydial. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.
By type
| cervicitis | A56.09 | Other chlamydial infection of lower genitourinary tract | |
| conjunctivitis | A74.0 | Chlamydial conjunctivitis | |
| cystitis | A56.01 | Chlamydial cystitis and urethritis | |
| endometritis | A56.11 | Chlamydial female pelvic inflammatory disease | |
| epididymitis | A56.19 | Other chlamydial genitourinary infection | |
| orchitis | A56.19 | Other chlamydial genitourinary infection | |
| peritonitis | A74.81 | Chlamydial peritonitis | |
| pharyngitis | A56.4 | Chlamydial infection of pharynx | |
| proctitis | A56.3 | Chlamydial infection of anus and rectum | |
| psittaci | A70 | Chlamydia psittaci infections | |
| salpingitis | A56.11 | Chlamydial female pelvic inflammatory disease | |
| sexually-transmitted infection NEC | A56.8 | Sexually transmitted chlamydial infection of other sites | |
| specified NEC | A74.89 | Other chlamydial diseases | |
| urethritis | A56.01 | Chlamydial cystitis and urethritis | |
| vulvovaginitis | A56.02 | Chlamydial vulvovaginitis |
Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources