R50.83 Postvaccination fever

Billable ICD-10-CM code, FY2026.

Applicable to

• Postimmunization fever

Applies from R50 Fever of other and unknown origin

Excludes1 (never code together)

• chills without fever (R68.83)
• febrile convulsions (R56.0-)
• fever of unknown origin during labor (O75.2)
• fever of unknown origin in newborn (P81.9)
• hypothermia due to illness (R68.0)
• malignant hyperthermia due to anesthesia (T88.3)
• puerperal pyrexia NOS (O86.4)

MS-DRG index

Defines the logic of DRG(s) 864 in MDC 18.

Approximate ICD-9-CM (GEMs)

• 780.63 Postvaccination fever

Code annotations containing back-references to R50.83

Back-references to R50.83

• Type 1 Excludes: R50.2 Drug induced fever ("postvaccination (postimmunization) fever (R50.83)")
• Type 1 Excludes: R50.82 Postprocedural fever ("postvaccination (postimmunization) fever (R50.83)")
• Type 2 Excludes: T88.1 Other complications following immunization, not elsewhere classified ("postimmunization fever (R50.83)")

Diagnosis Index entries for R50.83

• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › postimmunization
• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › postvaccination

Nearby codes

• R50 Fever of other and unknown origin
• R50.2 Drug induced fever
• R50.8 Other specified fever
• R50.81 Fever presenting with conditions classified elsewhere
• R50.82 Postprocedural fever
• R50.83 Postvaccination fever (this code)
• R50.84 Febrile nonhemolytic transfusion reaction
• R50.9 Fever, unspecified