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What do fifth-digit sub-classifications in ICD-9-CM focus on?

  1. Patient demographics

  2. Etiology, site, or manifestation

  3. Family medical history

  4. Environmental factors

The correct answer is: Etiology, site, or manifestation

Fifth-digit sub-classifications in ICD-9-CM focus on etiology, site, or manifestation. This means that these sub-classifications provide more detailed information about the cause (etiology), location (site), or characteristics (manifestation) of the patient's condition or illness. By using fifth-digit codes, medical coders can specify and differentiate between various aspects of a diagnosis, which is essential for accurate billing and tracking of diseases or health conditions. Patient demographics, family medical history, and environmental factors are not typically the focus of fifth-digit sub-classifications in ICD-9-CM.

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