A77.49 ICD-10-CM Code: Other ehrlichiosis

A77.49 is the ICD-10-CM diagnosis code for other ehrlichiosis. Other ehrlichiosis refers to a tick-borne bacterial infection caused by Ehrlichia species that doesn't fit into the more common types like Ehrlichia chaffeensis or Ehrlichia ewingii. This rare infection can cause fever, headache, and muscle aches similar to other tick-borne illnesses. A77.49 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering rickettsioses (a75-a79).

A77.49 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.

Verify the specific Ehrlichia species identified in the documentation, as A77.40 (Ehrlichiosis chaffeensis), A77.41 (Ehrlichiosis ewingii), and A77.49 (other) are distinct codes with different epidemiologic patterns.