R50.9
BillableFever, unspecified
Fever, unspecified
Coding Notes
Inclusion Terms
Alternative clinical terms for this condition
- Fever NOS
- Fever of unknown origin [FUO]
- Fever with chills
- Fever with rigors
- Hyperpyrexia NOS
- Persistent fever
- Pyrexia NOS
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
Also Known As / Clinical Terms
SNOMED CT
- F.U.O.7520000
- Fever of unknown origin7520000
- PUO - Pyrexia of unknown origin7520000
- Pyrexia of unknown origin7520000
- Aseptic fever9619006
- Calor17038008
- Increased skin temperature17038008
- Swinging fever42136008
- Swinging pyrexia42136008
- Swinging temperature42136008
- Chill43724002
- Shivering43724002
- Body temperature above reference range50177009
- Has a temperature50177009
- High body temperature50177009
- Increased body temperature50177009
- Temperature elevated50177009
- Temperature raised50177009
- Pel Ebstein fever52715007
- Pel-Ebstein fever52715007
- Remittent fever63993003
- Intermittent fever77957000
- Periodic fever, not disease77957000
- Picket fence fever77957000
- Spiking fever102496004
- Spiking temperature102496004
- Feeling feverish103001002
- Feels feverish103001002
- Hyperthermia-hyperphagia-hypothyroidism syndrome111569009
- Artificial fever111950007
- Factitious fever111950007
- Feverish cold135882008
- Cough with fever135883003
- Sweating fever186694006
- Rising phase of fever248432005
- Plateau phase of fever248433000
- Falling phase of fever248434006
- Prolonged fever248435007
- Slightly remittent fever248436008
- Biphasic fever248444008
- Dromedary fever248444008
- Saddleback fever248444008
- Fever, diurnal variation248445009
- Reversed diurnal fever248446005
- Typhus inversus248446005
- Fever defervescence248447001
- Central fever248449003
- Hypothalamic fever248449003
- Endocrine hyperthermia248454007
- Shivering or rigors248456009
- Acute rise of fever271749004
- Fever - fast rise271749004
- Fever - rapid rise271749004
- Gradual rise of fever271750004
- Continuous fever271751000
- Sustained fever271751000
- Staircase fever271752007
- Irregular fever271753002
- Crisis of fever271754008
- Fast fall of fever271754008
- Rapid fall of fever271754008
- Gradual fall of fever271755009
- Lysis of fever271755009
- Chills and fever274640006
- Fever with chills274640006
- Fever with rigors274640006
- Low grade fever304213008
- Low grade pyrexia304213008
- Mild pyrexia304213008
- Finding of phase of fever365989009
- Phase of fever - finding365989009
- Febrile386661006
- Fever386661006
- Pyrexia386661006
- Pyrexial386661006
- Desquamation of skin following febrile illness402345004
- MH - malignant hyperpyrexia405501007
- MHS - malignant hyperthermia susceptibility405501007
- Malignant hyperthermia405501007
- Hyperpyrexia409702008
- Disorder characterised by fever416113008
- Disorder characterized by fever416113008
- Febrile disorder416113008
- Febrile illness416113008
- Febrile illness (fever)416113008
- Febrile syndrome416113008
- Fever greater than 100.4 Fahrenheit426000000
- Fever greater than 38 Celsius426000000
- Febrile leucopenia427245000
- Febrile leukopenia427245000
- Neurogenic hyperthermia430691009
- Febrile myoclonus441604003
- Myoclonus associated with fever441604003
- Chronic fever704425001
- Fever of unknown origin co-occurrent with human immunodeficiency virus infection713731001
- Pyrexia of unknown origin co-occurrent with human immunodeficiency virus infection713731001
- Froster Iskenius Waterson syndrome719398004
- Malignant hyperthermia with arthrogryposis and torticollis syndrome719398004
- FTLS - Fever, thrombocytopenia, and leucopenia syndrome722401001
- FTLS - Fever, thrombocytopenia, and leukopenia syndrome722401001
- SFTS - Severe Fever with Thrombocytopenia Syndrome722401001
- Severe fever with thrombocytopenia syndrome722401001
- Fever due to infection722892007
- Fever with infection722892007
- Recurrent fever1078287008
- Recurrent pyrexia1078287008
- Hyperthermia1197782006
- Exercise-induced malignant hyperthermia1237338002
- Fever caused by virus10151000132103
- Viral fever10151000132103
UMLS
- Body temperature above reference rangeC0015967
- Body temperature above reference range (finding)C0015967
- Body temperature increasedC0015967
- FebrileC0015967
- FeverC0015967
- Fever (finding)C0015967
- Fever NOSC0015967
- Fever, unspecifiedC0015967
- FeverishC0015967
- FeversC0015967
- Has a temperatureC0015967
- High body temperatureC0015967
- High temperatureC0015967
- HyperthermiaC0015967
- Increased body temperatureC0015967
- PyrexiaC0015967
- Pyrexia NOSC0015967
- PyrexialC0015967
- PyrexiasC0015967
- Temperature elevatedC0015967
- Temperature elevationC0015967
- Temperature raisedC0015967
- elevated temperatureC0015967
- febrileC0015967
- febrisC0015967
- feverC0015967
- feveredC0015967
- feverishC0015967
- feversC0015967
- high body temperatureC0015967
- high temperatureC0015967
- hyperthermiaC0015967
- hyperthermicC0015967
- increase temperatureC0015967
- increased body temperatureC0015967
- increases temperatureC0015967
- pyrexiaC0015967
- pyrexialC0015967
- raised temperatureC0015967
- temperature elevationC0015967
- temperature increaseC0015967
- Chills and feverC0085594
- Fever ChillsC0085594
- Fever chillsC0085594
- Fever with chillsC0085594
- Fever with chills (finding)C0085594
- chill feverC0085594
- chills feverC0085594
- chills feversC0085594
- chills with feverC0085594
- fever chillsC0085594
- fever with chillsC0085594
- F.U.O.C0015970
- Fever of Unknown OriginC0015970
- Fever of unknown originC0015970
- Fever of unknown origin [FUO]C0015970
- PUO - Pyrexia of unknown originC0015970
- Pyrexia of unknown originC0015970
- Pyrexia of unknown origin (finding)C0015970
- Unknown Origin FeverC0015970
- Unknown Origin FeversC0015970
- f u oC0015970
- f.u.o.C0015970
- fever of origin unknownC0015970
- fever of unknown originC0015970
- fever of unknown origin fuoC0015970
- fever origin unknownC0015970
- fever unknown originC0015970
- fevers origin unknownC0015970
- fevers unknown originC0015970
- fuoC0015970
- pyrexia of unknown originC0015970
- unknown origin feverC0015970
- Fever with rigorsC2830450
- Fever, persistentC0476474
- Persistent feverC0476474
- fever persistentC0476474
- fevers persistentC0476474
- persistent feverC0476474
- HyperpyrexiaC0392676
- Hyperpyrexia (finding)C0392676
- Hyperpyrexia NOSC0392676
- HyperpyrexialC0392676
- HyperpyrexiasC0392676
- hyperpyrexiaC0392676
Frequently Asked Questions
What is the ICD-10 code for fever, unspecified?
The ICD-10-CM code for fever, unspecified is R50.9. The full clinical description is "Fever, unspecified". R50.9 is a billable/specific code that can be used on insurance claims and medical billing.
What does ICD-10 code R50.9 mean?
ICD-10-CM code R50.9 represents "Fever, unspecified". It is classified under Chapter 18: Symptoms, Signs and Abnormal Clinical and Laboratory Findings and is a billable/specific code that can be used on a claim.
Is R50.9 a billable code?
Yes, R50.9 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.
What chapter is R50.9 in?
R50.9 is in Chapter 18: Symptoms, Signs and Abnormal Clinical and Laboratory Findings (codes R00-R99).
What codes cannot be used with R50.9?
R50.9 has Excludes1 notes indicating codes that cannot be used together with it, including: chills without fever (R68.83); febrile convulsions (R56.0-); fever of unknown origin during labor (O75.2); and 4 more.
What SNOMED CT codes does R50.9 map to?
R50.9 maps to 56 SNOMED CT concepts: 271749004, 111950007, 9619006, 248444008, 50177009, and 51 more. SNOMED CT is a clinical terminology used in electronic health records.
What are the UMLS CUIs for R50.9?
R50.9 is linked to 6 UMLS Concept Unique Identifiers: C0015967, C0085594, C0015970, C2830450, C0476474, and 1 more. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.