2021

  1. ICD-10-CM Codes
    2. ›
  2. R00-R99 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
    3. ›
  3. R50-R69 General symptoms and signs
    4. ›
  4. R50- Fever of other and unknown origin
    5. ›
  5. 2021 ICD-10-CM Diagnosis Code R50

2021 ICD-10-CM Diagnosis Code R50

Fever of other and unknown origin

    2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
  • R50 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2021 edition of ICD-10-CM R50 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of R50 - other international versions of ICD-10 R50 may differ.
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as R50. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • chills without fever (
    ICD-10-CM Diagnosis Code R68.83

    Chills (without fever)

      2016 2017 2018 2019 2020 2021 Billable/Specific Code
    Applicable To
    • Chills NOS
    Type 1 Excludes
    • chills with fever (R50.9)
    R68.83
    )
  • febrile convulsions (
    ICD-10-CM Diagnosis Code R56.0

    Febrile convulsions

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    R56.0-
    )
  • fever of unknown origin during labor (
    ICD-10-CM Diagnosis Code O75.2

    Pyrexia during labor, not elsewhere classified

      2016 2017 2018 2019 2020 2021 Billable/Specific Code Maternity Dx (12-55 years)
    O75.2
    )
  • fever of unknown origin in newborn (
    ICD-10-CM Diagnosis Code P81.9

    Disturbance of temperature regulation of newborn, unspecified

      2016 2017 2018 2019 2020 2021 Billable/Specific Code Code on Newborn Record
    Applicable To
    • Fever of newborn NOS
    P81.9
    )
  • hypothermia due to illness (
    ICD-10-CM Diagnosis Code R68.0

    Hypothermia, not associated with low environmental temperature

      2016 2017 2018 2019 2020 2021 Billable/Specific Code
    Type 1 Excludes
    • hypothermia NOS (accidental) (T68)
    • hypothermia due to anesthesia (T88.51)
    • hypothermia due to low environmental temperature (T68)
    • newborn hypothermia (P80.-)
    R68.0
    )
  • malignant hyperthermia due to anesthesia (
    ICD-10-CM Diagnosis Code T88.3

    Malignant hyperthermia due to anesthesia

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Use Additional
    • code for adverse effect, if applicable, to identify drug (T41.- with fifth or sixth character 5)
    T88.3
    )
  • puerperal pyrexia NOS (
    ICD-10-CM Diagnosis Code O86.4

    Pyrexia of unknown origin following delivery

      2016 2017 2018 2019 2020 2021 Billable/Specific Code Maternity Dx (12-55 years)
    Applicable To
    • Puerperal infection NOS following delivery
    • Puerperal pyrexia NOS following delivery
    Type 2 Excludes
    • pyrexia during labor (O75.2)
    O86.4
    )
The following code(s) above R50 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to R50:
  • R00-R99
    2021 ICD-10-CM Range R00-R99

    Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified

    Note
    • This chapter includes symptoms, signs, abnormal results of clinical or other investigative procedures, and ill-defined conditions regarding which no diagnosis classifiable elsewhere is recorded.
    • Signs and symptoms that point rather definitely to a given diagnosis have been assigned to a category in other chapters of the classification. In general, categories in this chapter include the less well-defined conditions and symptoms that, without the necessary study of the case to establish a final diagnosis, point perhaps equally to two or more diseases or to two or more systems of the body. Practically all categories in the chapter could be designated 'not otherwise specified', 'unknown etiology' or 'transient'. The Alphabetical Index should be consulted to determine which symptoms and signs are to be allocated here and which to other chapters. The residual subcategories, numbered .8, are generally provided for other relevant symptoms that cannot be allocated elsewhere in the classification.
    • The conditions and signs or symptoms included in categories R00-R94 consist of:
    • (a) cases for which no more specific diagnosis can be made even after all the facts bearing on the case have been investigated;
    • (b) signs or symptoms existing at the time of initial encounter that proved to be transient and whose causes could not be determined;
    • (c) provisional diagnosis in a patient who failed to return for further investigation or care;
    • (d) cases referred elsewhere for investigation or treatment before the diagnosis was made;
    • (e) cases in which a more precise diagnosis was not available for any other reason;
    • (f) certain symptoms, for which supplementary information is provided, that represent important problems in medical care in their own right.
    Type 2 Excludes
    • abnormal findings on antenatal screening of mother (O28.-)
    • certain conditions originating in the perinatal period (P04-P96)
    • signs and symptoms classified in the body system chapters
    • signs and symptoms of breast (N63, N64.5)
    Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
Clinical Information
  • Fever in which the etiology cannot be ascertained.
Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 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
ICD-10-CM Codes Adjacent To R50
R48.8 Other symbolic dysfunctions
R48.9 Unspecified symbolic dysfunctions
R49 Voice and resonance disorders
R49.0 Dysphonia
R49.1 Aphonia
R49.2 Hypernasality and hyponasality
R49.21 Hypernasality
R49.22 Hyponasality
R49.8 Other voice and resonance disorders
R49.9 Unspecified voice and resonance disorder
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
R50.84 Febrile nonhemolytic transfusion reaction
R50.9 Fever, unspecified
R51 Headache
R51.0 Headache with orthostatic component, not elsewhere classified
R51.9 Headache, unspecified

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.

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