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BETA v.3.0

2025 ICD-10-CM code A56.4

Chlamydial infection of the pharynx (throat).

Use additional code to identify resistance to antimicrobial drugs (Z16.-). Exclude infections specific to the perinatal period (P35-P39).

Testing and treatment are medically necessary to prevent complications, transmission to others, and adverse outcomes in pregnant women.

Clinicians diagnose based on symptoms (sore throat, difficulty swallowing, swollen lymph nodes), history, physical exam, and laboratory tests (pharyngeal swab culture). Treatment includes antibiotics like azithromycin or doxycycline. Pregnant patients may receive azithromycin or amoxicillin, as doxycycline is contraindicated during pregnancy.

In simple words: Chlamydia infection of the throat, a sexually transmitted infection passed through oral sex.

Chlamydial infection of the pharynx, caused by the bacteria Chlamydia trachomatis, is a sexually transmitted infection acquired through orogenital contact.

Example 1: A 25-year-old patient presents with a sore throat and difficulty swallowing after engaging in oral sex. A pharyngeal swab is taken, and the culture is positive for Chlamydia trachomatis., A 30-year-old pregnant woman reports a sore throat. During her prenatal checkup, her physician screens for STIs, and the pharyngeal culture reveals Chlamydia trachomatis infection., An asymptomatic 20-year-old individual undergoes routine STI screening, which includes a pharyngeal swab. The test result is positive for Chlamydia trachomatis despite the absence of any symptoms.

Documentation should include sexual history, symptoms (if present), physical exam findings, laboratory test results (pharyngeal swab culture), and prescribed treatment.

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