Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) - in the ICD-10-CM Index
Annotation Back-References in the 2025 ICD-10-CM Index to Diseases and Injuries
Browse the ICD-10-CM codes with references applicable to the clinical term "fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)"
Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) - R50.9 Fever, unspecified
abortus - A23.1 Brucellosis due to Brucella abortus
Aden (dengue) - A90 Dengue fever [classical dengue]
African tick bite - A77.8 Other spotted fevers
African tick-borne - A68.1 Tick-borne relapsing fever
American
aphthous - B08.8 Other specified viral infections characterized by skin and mucous membrane lesions
Argentinian hemorrhagic - A96.0 Junin hemorrhagic fever
Assam - B55.0 Visceral leishmaniasis
Australian Q - A78 Q fever
Bangkok hemorrhagic - A91 Dengue hemorrhagic fever
Barmah forest - A92.8 Other specified mosquito-borne viral fevers
Bartonella - A44.0 Systemic bartonellosis
bilious, hemoglobinuric - B50.8 Other severe and complicated Plasmodium falciparum malaria
blackwater - B50.8 Other severe and complicated Plasmodium falciparum malaria
blister - B00.1 Herpesviral vesicular dermatitis
Bolivian hemorrhagic - A96.1 Machupo hemorrhagic fever
Bonvale dam - T73.3 Exhaustion due to excessive exertion
boutonneuse - A77.1 Spotted fever due to Rickettsia conorii
brain - See: Encephalitis;
Brazilian purpuric - A48.4 Brazilian purpuric fever
breakbone - A90 Dengue fever [classical dengue]
Bullis - A77.0 Spotted fever due to Rickettsia rickettsii
Bunyamwera - A92.8 Other specified mosquito-borne viral fevers
Burdwan - B55.0 Visceral leishmaniasis
Bwamba - A92.8 Other specified mosquito-borne viral fevers
Cameroon - See: Malaria;
Canton - A75.9 Typhus fever, unspecified
catarrhal (acute) - J00 Acute nasopharyngitis [common cold]
chronic - J31.0 Chronic rhinitis
cat-scratch - A28.1 Cat-scratch disease
Central Asian hemorrhagic - A98.0 Crimean-Congo hemorrhagic fever
cerebral - See: Encephalitis;
cerebrospinal meningococcal - A39.0 Meningococcal meningitis
Chagres - B50.9 Plasmodium falciparum malaria, unspecified
Chandipura - A92.8 Other specified mosquito-borne viral fevers
Changuinola - A93.1 Sandfly fever
Charcot's (biliary) (hepatic) (intermittent) - See: Calculus, bile duct;
Chitral - A93.1 Sandfly fever
Colombo - See: Fever, paratyphoid;
Colorado tick (virus) - A93.2 Colorado tick fever
congestive (remittent) - See: Malaria;
Congo virus - A98.0 Crimean-Congo hemorrhagic fever
continued malarial - B50.9 Plasmodium falciparum malaria, unspecified
Corsican - See: Malaria;
Crimean-Congo hemorrhagic - A98.0 Crimean-Congo hemorrhagic fever
Cyprus - See: Brucellosis;
dandy - A90 Dengue fever [classical dengue]
deer fly - See: Tularemia;
dengue (virus) - A90 Dengue fever [classical dengue]
desert - B38.0 Acute pulmonary coccidioidomycosis
drug induced - R50.2 Drug induced fever
due to
enteric - A01.00 Typhoid fever, unspecified
ephemeral (of unknown origin) - R50.9 Fever, unspecified
epidemic hemorrhagic - A98.5 Hemorrhagic fever with renal syndrome
erysipelatous - See: Erysipelas;
estivo-autumnal (malarial) - B50.9 Plasmodium falciparum malaria, unspecified
famine - A75.0 Epidemic louse-borne typhus fever due to Rickettsia prowazekii
five day - A79.0 Trench fever
following delivery - O86.4 Pyrexia of unknown origin following delivery
Fort Bragg - A27.89 Other forms of leptospirosis
gastroenteric - A01.00 Typhoid fever, unspecified
gastromalarial - See: Malaria;
Gibraltar - See: Brucellosis;
glandular - See: Mononucleosis, infectious;
Haverhill - A25.1 Streptobacillosis
hay (allergic) - J30.1 Allergic rhinitis due to pollen
due to
with asthma (bronchial) - J45.909 Unspecified asthma, uncomplicated
heat (effects) - T67.01 Heatstroke and sunstroke
hematuric, bilious - B50.8 Other severe and complicated Plasmodium falciparum malaria
hemoglobinuric (malarial) (bilious) - B50.8 Other severe and complicated Plasmodium falciparum malaria
hemorrhagic (arthropod-borne) NOS - A94 Unspecified arthropod-borne viral fever
Argentinian - A96.0 Junin hemorrhagic fever
Bangkok - A91 Dengue hemorrhagic fever
Bolivian - A96.1 Machupo hemorrhagic fever
Central Asian - A98.0 Crimean-Congo hemorrhagic fever
Chikungunya - A92.0 Chikungunya virus disease
Crimean-Congo - A98.0 Crimean-Congo hemorrhagic fever
dengue (virus) - A91 Dengue hemorrhagic fever
epidemic - A98.5 Hemorrhagic fever with renal syndrome
Junin (virus) - A96.0 Junin hemorrhagic fever
Korean - A98.5 Hemorrhagic fever with renal syndrome
Kyasanur forest - A98.2 Kyasanur Forest disease
Machupo (virus) - A96.1 Machupo hemorrhagic fever
mite-borne - A93.8 Other specified arthropod-borne viral fevers
mosquito-borne - A92.8 Other specified mosquito-borne viral fevers
Omsk - A98.1 Omsk hemorrhagic fever
Philippine - A91 Dengue hemorrhagic fever
Russian - A98.5 Hemorrhagic fever with renal syndrome
Singapore - A91 Dengue hemorrhagic fever
Southeast Asia - A91 Dengue hemorrhagic fever
Thailand - A91 Dengue hemorrhagic fever
tick-borne NEC - A93.8 Other specified arthropod-borne viral fevers
with renal syndrome - A98.5 Hemorrhagic fever with renal syndrome
hepatic - See: Cholecystitis;
herpetic - See: Herpes;
icterohemorrhagic - A27.0 Leptospirosis icterohemorrhagica
Indiana - A93.8 Other specified arthropod-borne viral fevers
infective - B99.9 Unspecified infectious disease
specified NEC - B99.8 Other infectious disease
intermittent (bilious) - See Also: Malaria;
iodide - R50.2 Drug induced fever
Japanese river - A75.3 Typhus fever due to Rickettsia tsutsugamushi
jungle - See Also: Malaria;
yellow - A95.0 Sylvatic yellow fever
Junin (virus) hemorrhagic - A96.0 Junin hemorrhagic fever
Katayama - B65.2 Schistosomiasis due to Schistosoma japonicum
kedani - A75.3 Typhus fever due to Rickettsia tsutsugamushi
Kenya (tick) - A77.1 Spotted fever due to Rickettsia conorii
Kew Garden - A79.1 Rickettsialpox due to Rickettsia akari
Korean hemorrhagic - A98.5 Hemorrhagic fever with renal syndrome
Lassa - A96.2 Lassa fever
Lone Star - A77.0 Spotted fever due to Rickettsia rickettsii
Machupo (virus) hemorrhagic - A96.1 Machupo hemorrhagic fever
malaria, malarial - See: Malaria;
Malta - A23.9 Brucellosis, unspecified
Marseilles - A77.1 Spotted fever due to Rickettsia conorii
marsh - See: Malaria;
Mediterranean - See Also: Brucellosis; - A23.9 Brucellosis, unspecified
meningeal - See: Meningitis;
Meuse - A79.0 Trench fever
Mexican - A75.2 Typhus fever due to Rickettsia typhi
mianeh - A68.1 Tick-borne relapsing fever
miasmatic - See: Malaria;
mountain - See Also: Brucellosis;
meaning Rocky Mountain spotted fever - A77.0 Spotted fever due to Rickettsia rickettsii
mud - A27.9 Leptospirosis, unspecified
Neapolitan - See: Brucellosis;
neutropenic - D70.9 Neutropenia, unspecified
newborn - P81.9 Disturbance of temperature regulation of newborn, unspecified
environmental - P81.0 Environmental hyperthermia of newborn
Nine-Mile - A78 Q fever
non-exanthematous tick - A93.2 Colorado tick fever
North Asian tick-borne - A77.2 Spotted fever due to Rickettsia siberica
Omsk hemorrhagic - A98.1 Omsk hemorrhagic fever
Oroya - A44.0 Systemic bartonellosis
pacific coast tick - A77.8 Other spotted fevers
paludal - See: Malaria;
Panama (malarial) - B50.9 Plasmodium falciparum malaria, unspecified
Pappataci - A93.1 Sandfly fever
paratyphoid - A01.4 Paratyphoid fever, unspecified
parrot - A70 Chlamydia psittaci infections
periodic (Mediterranean) - M04.1 Periodic fever syndromes
persistent (of unknown origin) - R50.9 Fever, unspecified
petechial - A39.0 Meningococcal meningitis
pharyngoconjunctival - B30.2 Viral pharyngoconjunctivitis
Philippine hemorrhagic - A91 Dengue hemorrhagic fever
phlebotomus - A93.1 Sandfly fever
Piry (virus) - A93.8 Other specified arthropod-borne viral fevers
Plasmodium ovale - B53.0 Plasmodium ovale malaria
Pontiac - A48.2 Nonpneumonic Legionnaires' disease [Pontiac fever]
postimmunization - R50.83 Postvaccination fever
postoperative - R50.82 Postprocedural fever
due to infection - T81.40 Infection following a procedure, unspecified
posttransfusion - R50.84 Febrile nonhemolytic transfusion reaction
postvaccination - R50.83 Postvaccination fever
presenting with conditions classified elsewhere - R50.81 Fever presenting with conditions classified elsewhere
pretibial - A27.89 Other forms of leptospirosis
puerperal - O86.4 Pyrexia of unknown origin following delivery
Q - A78 Q fever
quadrilateral - A78 Q fever
quartan (malaria) - B52.9 Plasmodium malariae malaria without complication
Queensland (coastal) (tick) - A77.3 Spotted fever due to Rickettsia australis
quintan - A79.0 Trench fever
rabbit - See: Tularemia;
rat-bite - A25.9 Rat-bite fever, unspecified
recurrent - See: Fever, relapsing;
relapsing (Borrelia) - A68.9 Relapsing fever, unspecified
Carter's (Asiatic) - A68.1 Tick-borne relapsing fever
Dutton's (West African) - A68.1 Tick-borne relapsing fever
Koch's - A68.9 Relapsing fever, unspecified
louse-borne - A68.0 Louse-borne relapsing fever
Novy's
Obermeyer's (European) - A68.0 Louse-borne relapsing fever
tick-borne - A68.1 Tick-borne relapsing fever
remittent (bilious) (congestive) (gastric) - See: Malaria;
rheumatic (active) (acute) (chronic) (subacute) - I00 Rheumatic fever without heart involvement
active with heart involvement - See: category; - I01 Rheumatic fever with heart involvement
inactive or quiescent with
cardiac hypertrophy - I09.89 Other specified rheumatic heart diseases
carditis - I09.9 Rheumatic heart disease, unspecified
endocarditis - I09.1 Rheumatic diseases of endocardium, valve unspecified
aortic (valve) - I06.9 Rheumatic aortic valve disease, unspecified
with mitral (valve) disease - I08.0 Rheumatic disorders of both mitral and aortic valves
mitral (valve) - I05.9 Rheumatic mitral valve disease, unspecified
with aortic (valve) disease - I08.0 Rheumatic disorders of both mitral and aortic valves
pulmonary (valve) - I09.89 Other specified rheumatic heart diseases
tricuspid (valve) - I07.8 Other rheumatic tricuspid valve diseases
heart disease NEC - I09.89 Other specified rheumatic heart diseases
heart failure (congestive) (conditions in category I50.) - I09.81 Rheumatic heart failure
left ventricular failure (conditions in I50.1-I50.4-) - I09.81 Rheumatic heart failure
myocarditis, myocardial degeneration (conditions in I51.4) - I09.0 Rheumatic myocarditis
pancarditis - I09.9 Rheumatic heart disease, unspecified
pericarditis - I09.2 Chronic rheumatic pericarditis
with central nervous system involvement - I02.9 Rheumatic chorea without heart involvement
Rocky Mountain spotted - A77.0 Spotted fever due to Rickettsia rickettsii
rose - J30.1 Allergic rhinitis due to pollen
Ross River - B33.1 Ross River disease
Russian hemorrhagic - A98.5 Hemorrhagic fever with renal syndrome
San Joaquin (Valley) - B38.0 Acute pulmonary coccidioidomycosis
sandfly - A93.1 Sandfly fever
Sao Paulo - A77.0 Spotted fever due to Rickettsia rickettsii
scarlet - A38.9 Scarlet fever, uncomplicated
seven day (leptospirosis) (autumnal) (Japanese) - A27.89 Other forms of leptospirosis
dengue - A90 Dengue fever [classical dengue]
shin-bone - A79.0 Trench fever
Singapore hemorrhagic - A91 Dengue hemorrhagic fever
solar - A90 Dengue fever [classical dengue]
Songo - A98.5 Hemorrhagic fever with renal syndrome
sore - B00.1 Herpesviral vesicular dermatitis
South African tick-bite - A68.1 Tick-borne relapsing fever
Southeast Asia hemorrhagic - A91 Dengue hemorrhagic fever
spinal - See: Meningitis;
spirillary - A25.0 Spirillosis
splenic - See: Anthrax;
spotted - A77.9 Spotted fever, unspecified
American - A77.0 Spotted fever due to Rickettsia rickettsii
Brazilian - A77.0 Spotted fever due to Rickettsia rickettsii
cerebrospinal meningitis - A39.0 Meningococcal meningitis
Colombian - A77.0 Spotted fever due to Rickettsia rickettsii
due to Rickettsia
africae (African tick bite fever) - A77.8 Other spotted fevers
australis - A77.3 Spotted fever due to Rickettsia australis
conorii - A77.1 Spotted fever due to Rickettsia conorii
parkeri - A77.8 Other spotted fevers
rickettsii - A77.0 Spotted fever due to Rickettsia rickettsii
sibirica - A77.2 Spotted fever due to Rickettsia siberica
specified type NEC - A77.8 Other spotted fevers
Ehrlichiosis - A77.40 Ehrlichiosis, unspecified
Rocky Mountain - A77.0 Spotted fever due to Rickettsia rickettsii
steroid - R50.2 Drug induced fever
streptobacillary - A25.1 Streptobacillosis
subtertian - B50.9 Plasmodium falciparum malaria, unspecified
Sumatran mite - A75.3 Typhus fever due to Rickettsia tsutsugamushi
sun - A90 Dengue fever [classical dengue]
swamp - A27.9 Leptospirosis, unspecified
swine - A02.8 Other specified salmonella infections
sylvatic, yellow - A95.0 Sylvatic yellow fever
Tahyna - B33.8 Other specified viral diseases
tertian - See: Malaria, tertian;
Thailand hemorrhagic - A91 Dengue hemorrhagic fever
thermic - T67.01 Heatstroke and sunstroke
three-day - A93.1 Sandfly fever
tick
American mountain - A93.2 Colorado tick fever
Colorado - A93.2 Colorado tick fever
Kemerovo - A93.8 Other specified arthropod-borne viral fevers
Mediterranean - A77.1 Spotted fever due to Rickettsia conorii
mountain - A93.2 Colorado tick fever
nonexanthematous - A93.2 Colorado tick fever
Quaranfil - A93.8 Other specified arthropod-borne viral fevers
tick-bite NEC - A93.8 Other specified arthropod-borne viral fevers
tick-borne (hemorrhagic) NEC - A93.8 Other specified arthropod-borne viral fevers
trench - A79.0 Trench fever
tsutsugamushi - A75.3 Typhus fever due to Rickettsia tsutsugamushi
typhogastric - A01.00 Typhoid fever, unspecified
typhoid (abortive) (hemorrhagic) (intermittent) (malignant) - A01.00 Typhoid fever, unspecified
typhomalarial - See: Malaria;
typhus - See: Typhus (fever);
undulant - See: Brucellosis;
unknown origin - R50.9 Fever, unspecified
uveoparotid - D86.89 Sarcoidosis of other sites
valley - B38.0 Acute pulmonary coccidioidomycosis
Venezuelan equine - A92.2 Venezuelan equine fever
vesicular stomatitis - A93.8 Other specified arthropod-borne viral fevers
Volhynian - A79.0 Trench fever
West
African - B50.8 Other severe and complicated Plasmodium falciparum malaria
Whitmore's - See: Melioidosis;
Wolhynian - A79.0 Trench fever
worm - B83.9 Helminthiasis, unspecified
yellow - A95.9 Yellow fever, unspecified
Zika virus - A92.5 Zika virus disease
Applicable Clinical Terms Definitions
Bartonella: A genus of gram-negative bacteria characteristically appearing in chains of several segmenting organisms. It occurs in man and arthropod vectors and is found only in the Andes region of South America. This genus is the etiologic agent of human bartonellosis. The genus Rochalimaea, once considered a separate genus, has recently been combined with the genus Bartonella as a result of high levels of relatedness in 16S rRNA sequence data and DNA hybridization data.
Blister: Visible accumulations of fluid within or beneath the epidermis.
Brain: The part of CENTRAL NERVOUS SYSTEM that is contained within the skull (CRANIUM). Arising from the NEURAL TUBE, the embryonic brain is comprised of three major parts including PROSENCEPHALON (the forebrain); MESENCEPHALON (the midbrain); and RHOMBENCEPHALON (the hindbrain). The developed brain consists of CEREBRUM; CEREBELLUM; and other structures in the BRAIN STEM.
Cameroon: A republic in central Africa lying east of CHAD and the CENTRAL AFRICAN REPUBLIC and west of NIGERIA. The capital is Yaounde.
Cyprus: An island republic in the eastern Mediterranean Sea. Its capital is Nicosia. It was colonized by the Phoenicians and ancient Greeks and ruled successively by the Assyrian, Persian, Ptolemaic, Roman, and Byzantine Empires. It was under various countries from the 12th to the 20th century but became independent in 1960. The name comes from the Greek Kupros, probably representing the Sumerian kabar or gabar, copper, famous in historic times for its copper mines. The cypress tree is also named after the island. (From Webster's New Geographical Dictionary, 1988, p308 & Room, Brewer's Dictionary of Names, 1992, p134)
Indiana: State bounded on the north by Lake Michigan and Michigan, on the east by Ohio, on the south by Kentucky, and on the west by Illinois.
Malta: An independent state consisting of three islands: Malta, Comino and Gozo, located in the Mediterranean Sea, south of Sicily. Its capital is Valetta.
Infant, Newborn: An infant during the first 28 days after birth.
Parrots: BIRDS of the large family Psittacidae, widely distributed in tropical regions and having a distinctive stout, curved hooked bill. The family includes LOVEBIRDS; AMAZON PARROTS; conures; PARAKEETS; and many other kinds of parrots.
Phlebotomus: A genus of PSYCHODIDAE which functions as the vector of a number of pathogenic organisms, including LEISHMANIA DONOVANI; LEISHMANIA TROPICA; Bartonella bacilliformis, and the Pappataci fever virus (SANDFLY FEVER NAPLES VIRUS).
Plasmodium ovale: A species of protozoan parasite causing MALARIA. It is the rarest of the four species of PLASMODIUM infecting humans, but is common in West African countries and neighboring areas.
Psychodidae: Small, hairy, moth-like flies which are of considerable public health importance as vectors of certain pathogenic organisms. Important disease-related genera are PHLEBOTOMUS, Lutzomyia, and Sergentomyia.
Wetlands: Environments or habitats at the interface between truly terrestrial ecosystems and truly aquatic systems making them different from each yet highly dependent on both. Adaptations to low soil oxygen characterize many wetland species.
Swine: Any of various animals that constitute the family Suidae and comprise stout-bodied, short-legged omnivorous mammals with thick skin, usually covered with coarse bristles, a rather long mobile snout, and small tail. Included are the genera Babyrousa, Phacochoerus (wart hogs), and Sus, the latter containing the domestic pig (see SUS SCROFA).
Ticks: Blood-sucking acarid parasites of the order Ixodida comprising two families: the softbacked ticks (ARGASIDAE) and hardbacked ticks (IXODIDAE). Ticks are larger than their relatives, the MITES. They penetrate the skin of their host by means of highly specialized, hooked mouth parts and feed on its blood. Ticks attack all groups of terrestrial vertebrates. In humans they are responsible for many TICK-BORNE DISEASES, including the transmission of ROCKY MOUNTAIN SPOTTED FEVER; TULAREMIA; BABESIOSIS; AFRICAN SWINE FEVER; and RELAPSING FEVER. (From Barnes, Invertebrate Zoology, 5th ed, pp543-44)
Vesicular Stomatitis: A viral disease caused by at least two distinct species (serotypes) in the VESICULOVIRUS genus: VESICULAR STOMATITIS INDIANA VIRUS and VESICULAR STOMATITIS NEW JERSEY VIRUS. It is characterized by vesicular eruptions on the ORAL MUCOSA in cattle, horses, pigs, and other animals. In humans, vesicular stomatitis causes an acute influenza-like illness.
Zika Virus: An arbovirus in the FLAVIVIRUS genus of the family FLAVIVIRIDAE. Originally isolated in the Zika Forest of UGANDA it has been introduced to Asia and the Americas.
