2016201720182019202020212022202320242025Billable/Specific Code
- R50.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
- The 2024 edition of ICD-10-CM R50.9 became effective on October 1, 2022.
- This is the American ICD-10-CM version of R50.9 – other international versions of ICD-10 R50.9 may differ.
ICD-10-CM R50.9 is grouped within Diagnostic Related Group(s):
- 864 Fever and inflammatory conditions
Applicable To
- Fever NOS
- Fever of unknown origin [FUO]
- Fever with chills
- Fever with rigors
- Hyperpyrexia NOS
- Persistent fever
- Pyrexia NOS
Code History
- 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
- 2016 (effective 10/1/2015): No change
- 2017 (effective 10/1/2016): No change
- 2018 (effective 10/1/2017): No change
- 2019 (effective 10/1/2018): No change
- 2020 (effective 10/1/2019): No change
- 2021 (effective 10/1/2020): No change
- 2022 (effective 10/1/2021): No change
- 2023 (effective 10/1/2022): No change
- 2024 (effective 10/1/2023): No change
- 2025 (effective 10/1/2024): No change
Diagnosis Index entries containing back-references to R50.9:
- with fever > Chill (s) R68.83
- body temperature (of unknown origin) > Elevated, elevation
- ephemeral (of unknown origin) > Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) R50.9
- intermittent (bilious) > Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) R50.9
- of unknown origin > intermittent (bilious) R50.9
- persistent (of unknown origin) > Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) R50.9
- unknown origin > Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) R50.9
- temperature (of unknown origin) > High
- unknown origin > Hyperpyrexia R50.9
- fever > Inanition R64
- persistent > Pyrexia (of unknown origin) R50.9
- with fever > Rigors R68.89
- body, high (of unknown origin) > Temperature