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2025 ICD-10-CM code A59.9

Trichomoniasis, unspecified.

Use A59.9 when the specific site of trichomoniasis infection is unknown or unspecified.If the site is known (e.g., urogenital), use the more specific code (e.g., A59.0).

Medically necessary when a patient has a confirmed diagnosis of trichomoniasis based on laboratory testing, regardless of symptoms or site of infection.

Diagnosis and treatment of trichomoniasis.

In simple words: This code refers to a sexually transmitted infection called trichomoniasis, when the specific site of infection isn't known.

Trichomoniasis, unspecified. This code excludes intestinal trichomoniasis (A07.8).

Example 1: A patient presents with symptoms suggestive of a sexually transmitted infection (STI), but the specific infection site is unknown. After testing positive for trichomoniasis, A59.9 is used before the site is determined., A patient with a history of multiple sexual partners presents with vaginal discharge.Testing reveals trichomoniasis, but further examination is needed to determine if other sites are affected. A59.9 is used until more information is available., During a routine STI screening, a patient tests positive for trichomoniasis, but they are asymptomatic and no specific site of infection is identified.A59.9 is used as the diagnosis code.

Positive laboratory test result for trichomoniasis. Documentation of signs and symptoms, if present.If a specific infection site is later determined, the code should be updated to reflect this information.

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