A79.9 Rickettsiosis, unspecified

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

Applicable to

• Rickettsial infection NOS

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 083.9 Rickettsiosis, unspecified (approximate)

Code annotations containing back-references to A79.9

Back-references to A79.9

• Type 1 Excludes: A49 Bacterial infection of unspecified site ("rickettsial infection NOS (A79.9)")

Diagnosis Index entries for A79.9

• Disease, diseased › rickettsial NOS
• Infection, infected, infective (opportunistic) › rickettsial NOS
• Rickettsial disease
• Rickettsiosis

Nearby codes

• A79.1 Rickettsialpox due to Rickettsia akari
• A79.8 Other specified rickettsioses
• A79.81 Rickettsiosis due to Ehrlichia sennetsu
• A79.82 Anaplasmosis [A. phagocytophilum]
• A79.89 Other specified rickettsioses
• A79.9 Rickettsiosis, unspecified (this code)