CurrentApr 1, 2026 – Sep 30, 2026
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Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
Disease index · Modifiers and references
Modifiers and references · icd10cm-index-April-1-2026-XML.xml
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
R50.9
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)abortus
A23.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Aden(dengue)
A90
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)African tick bite
A77.8
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)African tick-borne
A68.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)American
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › Americanmountain(tick)
A93.2
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › Americanspotted
A77.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)aphthous
B08.8
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)arbovirus, arboviral
A94
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › arbovirus, arboviralhemorrhagic
A94
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › arbovirus, arboviralspecified NEC
A93.8
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Argentinian hemorrhagic
A96.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Assam
B55.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Australian Q
A78
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Bangkok hemorrhagic
A91
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Barmah forest
A92.8
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Bartonella
A44.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)bilious, hemoglobinuric
B50.8
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)blackwater
B50.8
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)blister
B00.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Bolivian hemorrhagic
A96.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Bonvale dam
T73.3
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)boutonneuse
A77.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)brain
See: Encephalitis
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Brazilian purpuric
A48.4
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)breakbone
A90
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Bullis
A77.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Bunyamwera
A92.8
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Burdwan
B55.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Bwamba
A92.8
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Cameroon
See: Malaria
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Canton
A75.9
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)catarrhal(acute)
J00
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › catarrhal(acute)chronic
J31.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)cat-scratch
A28.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Central Asian hemorrhagic
A98.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)cerebral
See: Encephalitis
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)cerebrospinal meningococcal
A39.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Chagres
B50.9
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Chandipura
A92.8
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Changuinola
A93.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Charcot's(biliary) (hepatic) (intermittent)
See: Calculus, bile duct
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Chikungunya(viral) (hemorrhagic)
A92.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Chitral
A93.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Colombo
See: Fever, paratyphoid
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Colorado tick(virus)
A93.2
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)congestive(remittent)
See: Malaria
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Congo virus
A98.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)continued malarial
B50.9
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Corsican
See: Malaria
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Crimean-Congo hemorrhagic
A98.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Cyprus
See: Brucellosis
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)dandy
A90
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)deer fly
See: Tularemia
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)dengue(virus)
A90
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › dengue(virus)hemorrhagic
A91
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › dengue(virus)sandfly
A93.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)desert
B38.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)drug induced
R50.2
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)due to
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › due toconditions classified elsewhere
R50.81
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › due toheat
T67.01
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)enteric
A01.00
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)enteroviral exanthematous(Boston exanthem)
A88.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)ephemeral(of unknown origin)
R50.9
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)epidemic hemorrhagic
A98.5
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)erysipelatous
See: Erysipelas
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)estivo-autumnal(malarial)
B50.9
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)famine
A75.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)five day
A79.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)following delivery
O86.4
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Fort Bragg
A27.89
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)gastroenteric
A01.00
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)gastromalarial
See: Malaria
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Gibraltar
See: Brucellosis
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)glandular
See: Mononucleosis, infectious
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Guama(viral)
A92.8
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Haverhill
A25.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)hay(allergic)
J30.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hay(allergic)with asthma(bronchial)
J45.909
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hay(allergic) › with asthma(bronchial)with
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hay(allergic) › with asthma(bronchial) › withexacerbation(acute)
J45.901
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hay(allergic) › with asthma(bronchial) › withstatus asthmaticus
J45.902
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hay(allergic)due to
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hay(allergic) › due toallergen other than pollen
J30.89
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hay(allergic) › due topollen, any plant or tree
J30.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)heat(effects)
T67.01
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)hematuric, bilious
B50.8
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)hemoglobinuric(malarial) (bilious)
B50.8
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)hemorrhagic(arthropod-borne) NOS
A94
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOSwith renal syndrome
A98.5
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOSarenaviral
A96.9
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOS › arenaviralspecified NEC
A96.8
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOSArgentinian
A96.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOSBangkok
A91
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOSBolivian
A96.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOSCentral Asian
A98.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOSChikungunya
A92.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOSCrimean-Congo
A98.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOSdengue(virus)
A91
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOSepidemic
A98.5
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOSJunin(virus)
A96.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOSKorean
A98.5
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOSKyasanur forest
A98.2
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOSMachupo(virus)
A96.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOSmite-borne
A93.8
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOSmosquito-borne
A92.8
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOSOmsk
A98.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOSPhilippine
A91
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOSRussian
A98.5
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOSSingapore
A91
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOSSoutheast Asia
A91
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOSThailand
A91
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOStick-borne NEC
A93.8
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOSviral
A99
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › hemorrhagic(arthropod-borne) NOS › viralspecified NEC
A98.8
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)hepatic
See: Cholecystitis
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)herpetic
See: Herpes
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)icterohemorrhagic
A27.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Indiana
A93.8
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)infective
B99.9
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › infectivespecified NEC
B99.8
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)intermittent(bilious)
See also: Malaria
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › intermittent(bilious)of unknown origin
R50.9
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › intermittent(bilious)pernicious
B50.9
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)iodide
R50.2
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Japanese river
A75.3
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)jungle
See also: Malaria
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › jungleyellow
A95.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Junin(virus) hemorrhagic
A96.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Katayama
B65.2
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)kedani
A75.3
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Kenya(tick)
A77.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Kew Garden
A79.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Korean hemorrhagic
A98.5
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Lassa
A96.2
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Lone Star
A77.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Machupo(virus) hemorrhagic
A96.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)malaria, malarial
See: Malaria
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Malta
A23.9
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Marseilles
A77.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)marsh
See: Malaria
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Mayaro(viral)
A92.8
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Mediterranean
A23.9
See also: Brucellosis
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › Mediterraneanfamilial
M04.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › Mediterraneantick
A77.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)meningeal
See: Meningitis
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Meuse
A79.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Mexican
A75.2
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)mianeh
A68.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)miasmatic
See: Malaria
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)mosquito-borne(viral)
A92.9
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › mosquito-borne(viral)hemorrhagic
A92.8
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)mountain
See also: Brucellosis
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › mountainmeaning Rocky Mountain spotted fever
A77.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › mountaintick(American) (Colorado) (viral)
A93.2
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Mucambo(viral)
A92.8
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)mud
A27.9
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Neapolitan
See: Brucellosis
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)neutropenic
D70.9
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)newborn
P81.9
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › newbornenvironmental
P81.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Nine-Mile
A78
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)non-exanthematous tick
A93.2
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)North Asian tick-borne
A77.2
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Omsk hemorrhagic
A98.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)O'nyong-nyong(viral)
A92.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Oropouche(viral)
A93.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Oroya
A44.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)pacific coast tick
A77.8
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)paludal
See: Malaria
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Panama(malarial)
B50.9
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Pappataci
A93.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)paratyphoid
A01.4
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › paratyphoidA
A01.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › paratyphoidB
A01.2
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › paratyphoidC
A01.3
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)parrot
A70
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)periodic(Mediterranean)
M04.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)persistent(of unknown origin)
R50.9
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)petechial
A39.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)pharyngoconjunctival
B30.2
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Philippine hemorrhagic
A91
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)phlebotomus
A93.1
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Piry(virus)
A93.8
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Pixuna(viral)
A92.8
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Plasmodium ovale
B53.0
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)polioviral(nonparalytic)
A80.4
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Pontiac
A48.2
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)postimmunization
R50.83
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)postoperative
R50.82
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor) › postoperativedue to infection
T81.40
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)posttransfusion
R50.84
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)postvaccination
R50.83
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)presenting with conditions classified elsewhere
R50.81
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)pretibial
A27.89
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)puerperal
O86.4
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Q
A78
Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)quadrilateral
A78
