ICD-10 Code
International Classification of Diseases, 10th Revision
Apr 23, 2019

See: Fever of other and unknown origin

  ICD-10 Code for Fever, unspecified R50.9

R50.9 is a valid1 ICD 10 diagnosis code.

R50.9 is valid for submission for HIPAA-covered transactions.

Chapter 18 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
Section R50-R69 General symptoms and signs (R50-R69)
Category R50 Fever of other and unknown origin

• See below for any additional coding requirements that may be necessary.

• Check for any notations, inclusions and/or exclusions that are specific to this ICD 10 code before using

1 No additional coding requirements necessary.
Inclusion Term
  • Fever NOS
  • Fever of unknown origin [FUO]
  • Fever with chills
  • Fever with rigors
  • Hyperpyrexia NOS
  • Persistent fever
  • Pyrexia NOS
See also ICD 10 code for

Related Terms to “Fever, unspecified”

  • Chill(s) - R68.83
    • with fever - R50.9
  • Elevated, elevation
    • body temperature(of unknown origin) - R50.9
  • Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) - R50.9
    • ephemeral(of unknown origin) - R50.9
    • intermittent(bilious) — See also Malaria
      • of unknown origin - R50.9
    • persistent(of unknown origin) - R50.9
    • unknown origin - R50.9
  • FUO(fever of unknown origin) - R50.9
  • High
    • temperature(of unknown origin) - R50.9
  • Hyperpyrexia - R50.9
    • unknown origin - R50.9
  • Inanition - R64
    • fever - R50.9
  • PUO(pyrexia of unknown origin) - R50.9
  • Pyrexia(of unknown origin) - R50.9
    • persistent - R50.9
  • Rigors - R68.89
    • with fever - R50.9
  • Temperature
    • body, high(of unknown origin) - R50.9
See the ICD-10-CM Coding Guidelines.

Questions related to R50.9 Fever, unspecified

When ICD 10 was implemented on October 1, 2015, it did not affect physicians', outpatient facilities', and hospital outpatient departments' use of CPT codes on Medicare Fee-For-Service claims. Providers should continue to use CPT codes to report these services.