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ICD10BillableValid for clinical use

ICD-10 Code A56.4: Chlamydial infection of pharynx

A56.4 is a billable ICD-10 diagnosis code used to classify Chlamydial infection of pharynx in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Certain infectious and parasitic diseases (A00-B99).

What is this code?

ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. 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 pharynx in a patient's medical record.
  • May appear in hospital records, claims, referrals, and clinical documentation.
  • This code can be used as a clinically usable diagnosis entry in standardized coding workflows.

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.

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.

🔍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.
  • Pharyngeal chlamydial infection is coded separately from genitourinary, anorectal, 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
A56.0Chlamydial 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.
A56.1Chlamydial infection of pelviperitoneum and other genitourinary organs
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.
A56.2Chlamydial infection of 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.
A56.3Chlamydial infection of anus and rectum
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 code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.

Related specialists

Infectious Disease SpecialistGeneral Physician

Coding guidelines

Compatibility

Legacy and official ICD code match exactly.
Legacy codes
A56.4

Common synonyms

Chlamydial infection of pharynx

Frequently asked questions

Code details

CodeA56.4
SystemICD10
Display nameChlamydial infection of pharynx
ChapterCertain infectious and parasitic diseases (A00-B99)
BlockInfections with a predominantly sexual mode of transmission

Flags

BillableYes
Valid clinical useYes

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

Index terms

Matched terms
Chlamydia, chlamydialDisease, diseasedInfection, infected, infective(opportunistic)Pharyngitis(acute) (catarrhal)(gangrenous) (infective) (malignant) (membranous) (phlegmonous) (pseudomembranous) (simple) (subacute) (suppurative) (ulcerative) (viral)

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.