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ICD-10-CM Code A77.0
Spotted fever due to Rickettsia rickettsii

Billable Code
| ICD-10 from 2011 - 2016

A77.0 is a billable ICD code used to specify a diagnosis of spotted fever due to Rickettsia rickettsii. A 'billable code' is detailed enough to be used to specify a medical diagnosis.

The ICD code A770 is used to code Rocky Mountain spotted fever

Rocky Mountain spotted fever (RMSF), also known as blue disease, is the most lethal and most frequently reported rickettsial illness in the United States. It has been diagnosed throughout the Americas. Some synonyms for Rocky Mountain spotted fever in other countries include “tick typhus,” “Tobia fever” (Colombia), “São Paulo fever” or “febre maculosa” (Brazil), and “fiebre manchada” (Mexico). It is distinct from the viral tick-borne infection, Colorado tick fever. The disease is caused by Rickettsia rickettsii, a species of bacterium that is spread to humans by Dermacentor ticks. Initial signs and symptoms of the disease include sudden onset of fever, headache, and muscle pain, followed by development of rash. The disease can be difficult to diagnose in the early stages, and without prompt and appropriate treatment it can be fatal.

Specialty: Infectious Disease
MeSH Code: D012373
ICD 9 Code: 820

Petechial rash caused by Rocky Mountain spotted fever on the arm

Source: Wikipedia

Coding Notes for A77.0 Info for medical coders on how to properly use this ICD-10 code

Inclusion Terms:
Inclusion Terms
Rocky Mountain spotted fever
Sao Paulo fever

MS-DRG Mapping

  • DRG Group #867-869 - Other infectious and parasitic diseases diagnoses with MCC.
  • DRG Group #867-869 - Other infectious and parasitic diseases diagnoses with CC.
  • DRG Group #867-869 - Other infectious and parasitic diseases diagnoses without CC or MCC.

ICD-10-CM Alphabetical Index References for 'A77.0 - Spotted fever due to Rickettsia rickettsii'

The ICD-10-CM Alphabetical Index links the below-listed medical terms to the ICD code A77.0. Click on any term below to browse the alphabetical index.

Sao Paulo fever or typhus (A77.0)
Rocky Mountain(spotted) fever (A77.0)
Lone Star fever (A77.0)


Spotted fevers (approximate match)

This is the official approximate match mapping between ICD9 and ICD10, as provided by the General Equivalency mapping crosswalk. This means that while there is no exact mapping between this ICD10 code A77.0 and a single ICD9 code, 082.0 is an approximate match for comparison and conversion purposes.

Parent Code: A77 - Spotted fever [tick-borne rickettsioses]

** This Document Provided By ICD.Codes **
Source: http://icd.codes/icd10cm/A770