A56.4
BillableChlamydial infection of pharynx
Chlamydial infection of pharynx
Coding Notes
Includes
Conditions included under this code
- diseases generally recognized as communicable or transmissible
- sexually transmitted diseases due to Chlamydia
- trachomatis
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
- certain localized infections - see body system-related chapters
- •nonspecific and nongonococcal urethritisN34.1
- •Reiter's diseaseM02.3
- •neonatal chlamydial conjunctivitisP39.1
- •neonatal chlamydial pneumoniaP23.1
Excludes 2
Conditions not included here, but the patient may have both
- •carrier or suspected carrier of infectious diseaseZ22
- •infectious and parasitic diseases complicating pregnancy, childbirth and the puerperiumO98
- •infectious and parasitic diseases specific to the perinatal periodP35-P39
- •influenza and other acute respiratory infectionsJ00-J22
- •human immunodeficiency virus [HIV] diseaseB20
- •chlamydial lymphogranulomaA55
- •conditions classified toA74
Use Additional Code
Additional codes that should follow this code
Related Codes(5)
A56.0Chlamydial infection of lower genitourinary tract
A56.1Chlamydial infection of pelviperitoneum and oth GU organs
A56.2Chlamydial infection of genitourinary tract, unspecified
A56.3Chlamydial infection of anus and rectum
A56.8Sexually transmitted chlamydial infection of other sites
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(9)
SNOMED CT
UMLS
Clinical Terms
- Infection of pharynx caused by Chlamydia trachomatis
- Chlamydial pharyngitis (disorder)
- Chlamydial pharyngitis
Frequently Asked Questions
What is the ICD-10 code for chlamydial infection of pharynx?
The ICD-10-CM code for chlamydial infection of pharynx is A56.4. The full clinical description is "Chlamydial infection of pharynx". A56.4 is a billable/specific code that can be used on insurance claims and medical billing.
What does ICD-10 code A56.4 mean?
ICD-10-CM code A56.4 represents “Chlamydial infection of pharynx”. It is classified under Chapter 1: Certain Infectious and Parasitic Diseases and is a billable/specific code that can be used on a claim.
Is A56.4 a billable code?
Yes, A56.4 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.
What chapter is A56.4 in?
A56.4 is in Chapter 1: Certain Infectious and Parasitic Diseases (codes A00-B99).
What codes cannot be used with A56.4?
A56.4 has Excludes1 notes indicating codes that cannot be used together with it, including: certain localized infections - see body system-related chapters; nonspecific and nongonococcal urethritis (N34.1); Reiter's disease (M02.3-); and 2 more.
Are additional codes required with A56.4?
Yes, when using A56.4, also report: resistance to antimicrobial drugs (Z16.-).
What SNOMED CT codes does A56.4 map to?
A56.4 maps to 2 SNOMED CT concepts: 232403001, 446594000. SNOMED CT is a clinical terminology used in electronic health records.
What are the UMLS CUIs for A56.4?
A56.4 is linked to 1 UMLS Concept Unique Identifier: C0149965. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does A56.4 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like chlamydial infection of pharynx affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of A56.4?
A56.4 maps to the ICD-11 code: 1A81.Y (Non-ulcerative sexually transmitted chlamydial infection of other specified site).
Automate ICD-10 Coding With AI
Send clinical text to the AutoICD API and get back structured ICD-10 codes with confidence scores. Integrates into any EHR or billing system in minutes.
Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.