A77.0 Spotted fever due to Rickettsia rickettsii

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applicable to

• Rocky Mountain spotted fever
• Sao Paulo fever

MS-DRG index

Defines the logic of DRG(s) 867-869 in MDC 18.

Approximate ICD-9-CM (GEMs)

• 082.0 Spotted fevers (approximate)

Diagnosis Index entries for A77.0

• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › American › spotted
• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › Bullis
• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › Lone Star
• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › mountain › meaning Rocky Mountain spotted fever
• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › Rocky Mountain spotted
• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › Sao Paulo
• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › spotted › American
• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › spotted › Brazilian
• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › spotted › Colombian
• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › spotted › due to Rickettsia › rickettsii
• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › spotted › Rocky Mountain
• Lone Star fever
• Rocky Mountain (spotted) fever
• Sao Paulo fever or typhus
• Typhus (fever) › Sao Paulo

Nearby codes

• A77 Spotted fever [tick-borne rickettsioses]
• A77.0 Spotted fever due to Rickettsia rickettsii (this code)
• A77.1 Spotted fever due to Rickettsia conorii
• A77.2 Spotted fever due to Rickettsia siberica
• A77.3 Spotted fever due to Rickettsia australis
• A77.4 Ehrlichiosis
• A77.40 Ehrlichiosis, unspecified