ICD-10-CM 2027 diagnosis code

A77Spotted fever [tick-borne rickettsioses]

Not billable — use a more specific code

A77 is a header code, so it can't be reported by itself. Choose one of the 7 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About A77

A77 is the ICD-10-CM diagnosis code for spotted fever [tick-borne rickettsioses]. It belongs to block A75-A79 (rickettsioses) and chapter 1 (certain infectious and parasitic diseases). It is a header code, so it can't be reported by itself; one of its 7 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: A77.0 (rickettsii), A77.1 (conorii), A77.2 (siberica), A77.3 (australis), A77.4 (ehrlichiosis), A77.8 (fevers) and A77.9 (unspecified).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under A77

Notes that apply from higher levels

Instructions written at a parent level also apply to A77.

Broader instructions also apply from Chapter 1: Certain infectious and parasitic diseases.

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about A77

Is A77 billable?: No. A77 is a header code. Report one of its more specific subcodes instead.