A77.8 ICD-10-CM Code: Other spotted fevers

A77.8 is the ICD-10-CM diagnosis code for other spotted fevers. This code represents rare or less common types of spotted fever infections caused by bacteria transmitted through tick bites, which cause fever and characteristic skin rashes. These are serious infections that require prompt medical treatment with antibiotics. A77.8 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering rickettsioses (a75-a79).

A77.8 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.

Use this code only when the specific type of spotted fever is not classifiable under the more common categories (Rocky Mountain spotted fever A77.0, Boutonneuse fever A77.1, etc.); always document the specific organism or fever type in the medical record.