ICD10
ICD-10 Code A56.0: Chlamydial infection of lower genitourinary tract
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Certain infectious and parasitic diseases (A00-B99).
đź“‹Clinical overview
This ICD-10 code is commonly used when documentation describes sexually transmitted chlamydial infection. The most accurate code depends on whether the documented site is lower genitourinary tract, pelvic or other genitourinary organs, anus or rectum, pharynx, or another specified site.
When is it used?
- May be used when a clinician documents chlamydial infection of lower genitourinary tract in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
- This entry may represent a broader category rather than the most specific billable code.
đź©şClinical context
When commonly used
- Primary-care, urgent-care, sexual-health, gynecology, urology, colorectal, and follow-up workflows where chlamydial infection affects diagnosis, treatment planning, partner management, or site-specific counseling.
- Coding and utilization-review workflows where the chart identifies the exact anatomic site of sexually transmitted chlamydial disease and that site changes final code specificity.
Common management context
- Evaluation often includes symptom review, site-specific exam context, STI test-result review, treatment planning, partner-treatment counseling, and follow-up testing planning.
- Documentation usually becomes more specific when the chart identifies lower-genitourinary versus pelvic-inflammatory versus anorectal versus pharyngeal involvement, or clarifies another specified site.
- Specialist context already linked on this page includes Infectious Disease Specialist, General Physician, Urologist.
🔍Key distinctions
Important notes
- This ICD-10 family captures sexually transmitted chlamydial disease across multiple anatomic sites rather than a single genitourinary presentation alone.
- Site detail, such as lower genitourinary, pelvic inflammatory, anorectal, pharyngeal, or another specified site, drives final code specificity inside this family.
- Lower-genitourinary-tract chlamydial infection is coded separately from pelvic inflammatory, anorectal, pharyngeal, or other-site sexually transmitted chlamydial disease.
- Documentation that describes sexually transmitted chlamydial infection is coded differently from gonococcal infection, nongonococcal urethritis without documented chlamydia, or other sexually transmitted infections when the organism or site is documented more clearly.
Related codes to consider
A56.00Chlamydial infection of lower genitourinary tract, unspecified
Related sexually-transmitted-chlamydial ICD-10 code; documentation often becomes more specific when the chart identifies lower versus upper genitourinary tract, anorectal, pharyngeal, or another specified chlamydial site.
A56.01Chlamydial cystitis and urethritis
Related sexually-transmitted-chlamydial ICD-10 code; documentation often becomes more specific when the chart identifies lower versus upper genitourinary tract, anorectal, pharyngeal, or another specified chlamydial site.
A56.02Chlamydial vulvovaginitis
Related sexually-transmitted-chlamydial ICD-10 code; documentation often becomes more specific when the chart identifies lower versus upper genitourinary tract, anorectal, pharyngeal, or another specified chlamydial site.
A56.09Other chlamydial infection of lower genitourinary tract
Related sexually-transmitted-chlamydial ICD-10 code; documentation often becomes more specific when the chart identifies lower versus upper genitourinary tract, anorectal, pharyngeal, or another specified chlamydial site.
Code hierarchy
chapter
1Certain infectious and parasitic diseases (A00-B99)
block
A50-A64Infections with a predominantly sexual mode of transmission
category
A56Other sexually transmitted chlamydial diseases
currentA56
Where you may see this code
You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.
Related specialists
Infectious Disease SpecialistGeneral PhysicianUrologist
Related codes
Sibling codes
A56.1Chlamydial infection of pelviperitoneum and other genitourinary organsA56.2Chlamydial infection of genitourinary tract, unspecifiedbillableA56.3Chlamydial infection of anus and rectumbillableA56.4Chlamydial infection of pharynxbillableA56.8Sexually transmitted chlamydial infection of other sitesbillable
Mapped diagnoses and classifications
SNOMED_CT 428015005high
Chlamydia trachomatis infection of genital structure
Source: SNOMED International ICD-10 map
SNOMED_CT 236749007high
Chlamydial balanitis
Source: SNOMED International ICD-10 map
SNOMED_CT 237106009high
Chlamydial bartholinitis
Source: SNOMED International ICD-10 map
SNOMED_CT 237084006high
Chlamydial cervicitis
Source: SNOMED International ICD-10 map
SNOMED_CT 186729003high
Chlamydial infection of lower genitourinary tract
Source: SNOMED International ICD-10 map
SNOMED_CT 236683007high
Chlamydial urethritis
Source: SNOMED International ICD-10 map
Coding guidelines
Compatibility
Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.
Legacy codes
A56.0
Replacement codes
A56.00 — Chlamydial infection of lower genitourinary tract, unspecifiedA56.01 — Chlamydial cystitis and urethritisA56.02 — Chlamydial vulvovaginitisA56.09 — Other chlamydial infection of lower genitourinary tract
Common synonyms
Chlamydial infection of lower genitourinary tract
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.