ICD-10-CM Alphabetic Index · FY 2026 Letter F
Index Terms Starting With F ICD-10-CM
Home › ICD-10-CM Codes List › Index to Diseases and Injuries › FThe letter F section of the FY 2026 Alphabetic Index carries 270 main terms , from Faber's syndrome to Fussy baby. Terms with a direct code link straight to the code page, cross references point to the main term that holds the codes, and terms with a handful of sub-entries render in full right here. The largest terms open their own full index page.
✓ Built from the official CMS FY 2026 index file Effective Oct 1, 2025 – Sep 30, 2026
Faber's syndrome (achlorhydric anemia) Code D50.9 Fabry (-Anderson) disease Code E75.21 Facet syndrome Code M47.89 Non-billable Faciocephalalgia, autonomic Code G90.09 See also: Neuropathy, peripheral, autonomic psychic, associated with diseases classified elsewhere
F54 psychological
affecting physical conditions
F54 or behavioral
Fahr disease (of brain) Code G23.8 Fahr Volhard disease (of kidney) Code I12. abortion see Abortion, attempted
attempted abortion see Abortion, attempted
Fallen arches Cross-ref See: Deformity, limb, flat foot Falling, falls (repeated) Sub-entries R29.6 any organ or part see Prolapse
Fallopian Sub-entries
Fallot's Sub-entries
tetrad or tetralogy
Q21.3 False Sub-entries see also condition joint see Nonunion, fracture
at or after 37 completed weeks of gestation
O47.1 Faltering growth Code R62.51 Family, familial Sub-entries see also condition involving divorce or separation
Z63.5 Famine (effects of) Sub-entries T73.0 Non-billable edema see Malnutrition, severe
Fanconi (-de Toni) (-Debré) syndrome Sub-entries E72.09 Fanconi ('s) anemia Code D61.03 Fanconi hypoplastic anemia Code D61.03 Fanconi panmyelopathy Code D61.03 Farber's disease or syndrome Code E75.29 Farmer's Sub-entries
Farsightedness Cross-ref See: Hypermetropia
Fascia Cross-ref See: condition diffuse (eosinophilic)
M35.4 Fasciolopsis, fasciolopsiasis (intestinal) Code B66.5 Fascioscapulohumeral myopathy Code G71.02 embolism see Embolism, fat
excessive see also Obesity
in heart see Degeneration, myocardial
auditory deafness see Deafness
Fatness Cross-ref See: Obesity Fatty Sub-entries see also condition degeneration see Degeneration, fatty
heart (enlarged) see Degeneration, myocardial
Fauces Cross-ref See: condition Fauchard's disease (periodontitis) Cross-ref See: Periodontitis
Favism (anemia) Code D55.0 Favus Cross-ref See: Dermatophytosis
Fazio-Londe disease or syndrome Code G12.1 Fear complex or reaction Code F40.9 Fear of Cross-ref See: Phobia
Feared complaint unfounded Code Z71.1 Febris, febrile Sub-entries see also Fever flava
A95.9 see also Fever, yellow pestis see Plague
recurrens see Fever, relapsing
Fecal Sub-entries
Fecalith (impaction) Sub-entries K56.41 Feeble rapid pulse due to shock following injury Code T79.4 Non-billable problem (elderly) (infant)
R63.39 Feeling (of) Sub-entries
Feer's disease Cross-ref See: Poisoning, mercury
Feet Cross-ref See: condition Feigned illness Code Z76.5 Feil-Klippel syndrome (brevicollis) Code Q76.1 Feinmesser's (hidrotic) ectodermal dysplasia Code Q82.4 Felon Sub-entries see also Cellulitis, digit
with lymphangitis see Lymphangitis, acute, digit
foot joint
M05.07 Non-billable hand joint
M05.04 Non-billable Female genital cutting status Cross-ref See: Female genital mutilation status (FGM) type I (clitorectomy status)
N90.811 type II (clitorectomy with excision of labia minora status)
N90.812 type III (infibulation status)
N90.813 Femur, femoral Cross-ref See: condition Fenestration, fenestrated Sub-entries see also Imperfect, closure cusps, heart valve NEC
Q24.8 Fernell's disease (aortic aneurysm) Code I71.9 Fertile eunuch syndrome Code E23.0 Fetid Sub-entries
Fetishism Sub-entries F65.0 Fetus, fetal Sub-entries see also condition alcohol syndrome (dysmorphic)
Q86.0 compressus
O31.0 Non-billable FFA (frontal fibrosing alopecia) Code L66.12 atrial or auricular (established)
I48.91 Fibrin Sub-entries
ball or bodies, pleural (sac)
J94.1 chamber, anterior (eye) (gelatinous exudate) see Iridocyclitis, acute
Fibrinogenolysis Cross-ref See: Fibrinolysis
Fibrinogenopenia Sub-entries D68.8 antepartum hemorrhage see Hemorrhage, antepartum, with coagulation defect
following
abortion see Abortion by type complicated by hemorrhage
ectopic or molar pregnancy
O08.1 Fibrinopenia (hereditary) Sub-entries D68.2 Fibrinopurulent Cross-ref See: condition Fibrinous Cross-ref See: condition cellular intracanalicular
D24 Non-billable intracanalicular
cellular
D24 Non-billable Fibroadenosis, breast (chronic) (cystic) (diffuse) (periodic) (segmental) Code N60.2 Non-billable Fibroangioma Sub-entries see also Neoplasm, benign, by site
juvenile
specified site see Neoplasm, benign, by site
Fibrochondrosarcoma Cross-ref See: Neoplasm, cartilage, malignant
disease see also Fibrosis, cystic
breast see Mastopathy, cystic
kidney (congenital)
Q61.8 Fibrodysplasia ossificans progressiva Cross-ref See: Myositis, ossificans, progressiva Fibroelastosis (cordis) (endocardial) (endomyocardial) Code I42.4 Fibroid (tumor) Sub-entries see also Neoplasm, connective tissue, benign disease, lung (chronic) see Fibrosis, lung
heart (disease) see Myocarditis
in pregnancy or childbirth
O34.1 Non-billable causing obstructed labor
O65.5 Fibrolipoma Cross-ref See: Lipoma Fibroliposarcoma Cross-ref See: Neoplasm, connective tissue, malignant
Fibroma Sub-entries see also Neoplasm, connective tissue, benign ameloblastic see Cyst, calcifying odontogenic
bone (nonossifying) see Disorder, bone, specified type NEC
ossifying see Neoplasm, bone, benign
cementifying see Neoplasm, bone, benign
abdominal see Neoplasm, connective tissue, uncertain behavior
aggressive
D48.11 Non-billable congenital generalized see Neoplasm, connective tissue, uncertain behavior
Fibromyoma Sub-entries see also Neoplasm, connective tissue, benign
uterus (corpus) see also Leiomyoma, uterus
in pregnancy or childbirth see Fibroid, in pregnancy or childbirth
causing obstructed labor
O65.5 Fibromyxolipoma Code D17.9 Fibromyxoma Cross-ref See: Neoplasm, connective tissue, benign
Fibromyxosarcoma Cross-ref See: Neoplasm, connective tissue, malignant
Fibro-odontoma, ameloblastic Cross-ref See: Cyst, calcifying odontogenic
Fibro-osteoma Cross-ref See: Neoplasm, bone, benign
Fibroplasia, retrolental Code H35.17 Non-billable Fibropurulent Cross-ref See: condition Fibrosarcoma Sub-entries see also Neoplasm, connective tissue, malignant congenital see Neoplasm, connective tissue, malignant
fascial see Neoplasm, connective tissue, malignant
Fibrosclerosis Sub-entries
breast
N60.3 Non-billable penis (corpora cavernosa)
N48.6 arteriocapillary see Arteriosclerosis
Fibrositis (periarticular) Sub-entries M79.7 nodular, chronic (Jaccoud's) (rheumatoid) see Arthropathy, postrheumatic, chronic
Fibrotic Cross-ref See: Fibrosis
Fibrous Cross-ref See: condition Fibroxanthoma Sub-entries see also Neoplasm, connective tissue, benign
atypical see Neoplasm, connective tissue, uncertain behavior
malignant see Neoplasm, connective tissue, malignant
Fibroxanthosarcoma Cross-ref See: Neoplasm, connective tissue, malignant
Fiedler's Sub-entries
disease (icterohemorrhagic leptospirosis)
A27.0 myocarditis (acute)
I40.1 Fifth disease Sub-entries B08.3 Filaria, filarial, filariasis Cross-ref See: Infestation, filarial Filatov's disease Cross-ref See: Mononucleosis, infectious File-cutter's disease Cross-ref See: Poisoning, lead
17-ketosteroids, elevated
R82.5 Finger Cross-ref See: condition Fire, Saint Anthony's Cross-ref See: Erysipelas
Fire-setting Sub-entries
pathological (compulsive)
F63.1 Fish hook stomach Code K31.89 Fishmeal-worker's lung Code J67.8 artificial
arm see Admission, adjustment, artificial, arm
breast
Z44.3 Non-billable Fitzhugh-Curtis syndrome Sub-entries
due to
Neisseria gonorrhea (gonococcal peritonitis)
A54.85 Fitz's syndrome (acute hemorrhagic pancreatitis) Code K85.80 See also: Pancreatitis, acute joint see Ankylosis
stapes see Ankylosis, ear ossicles
deafness see Deafness, conductive
Flaccid Sub-entries see also condition
associated with chest compression and cardiopulmonary resuscitation
M96.A4 newborn (birth injury)
P13.8 Flajani's disease Cross-ref See: Hyperthyroidism, with, goiter (diffuse)
Flashbacks (residual to hallucinogen use) Code F16.283 chamber (eye) see Disorder, globe, hypotony, flat anterior chamber
foot (acquired) (fixed type) (painful) (postural) see also Deformity, limb, flat foot
Flatau-Schilder disease Code G37.0 Flatback syndrome Sub-entries M40.30 Flatulence Sub-entries R14.3 Flax-dresser's disease Code J66.1 Flecks, glaucomatous (subcapsular) Cross-ref See: Cataract, complicated
Fleischer (-Kayser) ring (cornea) Code H18.04 Non-billable Flexibilitas cerea Cross-ref See: Catalepsy
amputation stump (surgical)
T87.89 cervix see Malposition, uterus
contracture, joint see Contraction, joint
deformity, joint
M21.20 see also Deformity, limb, flexion Flexner-Boyd dysentery Code A03.2 Flexner's dysentery Code A03.1 Flexure Cross-ref See: Flexion Flint murmur (aortic insufficiency) Code I35.1 Floater, vitreous Cross-ref See: Opacity, vitreous
cartilage (joint) see also Loose, body, joint
knee see Derangement, knee, loose body
gallbladder, congenital
Q44.1 Floor Cross-ref See: condition Floppy Sub-entries
baby syndrome (nonspecific)
P94.2 iris syndrome (intraoperative) (IFIS)
H21.81 nonrheumatic mitral valve syndrome
I34.1 Flu Sub-entries see also Influenza
avian
J09.X2 see also Influenza, due to, identified novel influenza A virus bird
J09.X2 see also Influenza, due to, identified novel influenza A virus swine (viruses that normally cause infections in pigs)
J09.X2 see also Influenza, due to, identified novel influenza A virus Fluctuating blood pressure Code I99.8 heart see Failure, heart, congestive
joint see Effusion, joint
Flukes NEC Sub-entries see also Infestation, fluke
blood NEC see Schistosomiasis
Fluor (vaginalis) Sub-entries N89.8 trichomonal or due to Trichomonas (vaginalis)
A59.00 Flush syndrome Code E34.09 Flushing Sub-entries R23.2 FNHTR (febrile nonhemolytic transfusion reaction) Code R50.84 Fochier's abscess - code by site under Abscess Term
Focus, Assmann's Cross-ref See: Tuberculosis, pulmonary
Foix-Alajouanine syndrome Code G95.19 Fold, folds (anomalous) Sub-entries see also Anomaly, by site
Descemet's membrane see Change, corneal membrane, Descemet's, fold
Follicle Sub-entries
cervix (nabothian) (ruptured)
N88.8 graafian, ruptured, with hemorrhage
N83.0 Non-billable Follicular Cross-ref See: condition abscedens et suffodiens
L66.3 deep see Furuncle, by site
Folliculome lipidique Sub-entries
specified site see Neoplasm, benign, by site
unspecified site
Følling's disease Code E70.0 Follow-up Cross-ref See: Examination, follow-up
Fong's syndrome (hereditary osteo-onychodysplasia) Code Q87.2 asphyxia (from aspiration or inhalation) see Foreign body, by site
choked on see Foreign body, by site
deprivation
T73.0 Non-billable Foramen ovale (nonclosure) (patent) (persistent) Code Q21.12 Forbes' glycogen storage disease Code E74.03 Fordyce-Fox disease Code L75.2 Fordyce's disease (mouth) Code Q38.6 Forearm Cross-ref See: condition Foreclosure on loan Code Z59.89 with
laceration see Laceration, by site, with foreign body
puncture wound see Puncture, by site, with foreign body
accidentally left following a procedure
T81.509 Non-billable Forestier's disease (rhizomelic pseudopolyarthritis) Sub-entries M35.3 meaning ankylosing hyperostosis see Hyperostosis, ankylosing
hyalin in cornea see Degeneration, cornea
sequestrum in bone (due to infection) see Osteomyelitis, chronic
valve
Fort Bragg fever Code A27.89 Fossa Sub-entries see also condition
Foster-Kennedy syndrome Code H47.14 Non-billable Fothergill's Sub-entries
disease (trigeminal neuralgia) see also Neuralgia, trigeminal
scarlatina anginosa
A38.9 Fournier disease or gangrene Sub-entries N49.3 Fourth Sub-entries
cranial nerve see condition
Foville's (peduncular) disease or syndrome Code G46.3 Fox (-Fordyce) disease (apocrine miliaria) Code L75.2 FPIES (food protein-induced enterocolitis syndrome) Code K52.21 Fracture, burst Cross-ref See: Fracture, traumatic, by site
Fracture, chronic Cross-ref See: Fracture, pathological, by site
Fracture, insufficiency Cross-ref See: Fracture, pathological, by site
Fracture, pathological (pathologic) Sub-entries see also Fracture, traumatic M84.40 compression (not due to trauma)
M48.50 Non-billable see also Collapse, vertebra acetabulum
S32.40 Non-billable column
anterior (displaced) (iliopubic)
S32.43 Non-billable bone, congenital (with blue sclera)
Q78.0 capillary (hereditary)
D69.8 Fragilitas Sub-entries
ossium (with blue sclerae) (hereditary)
Q78.0 Fragments, cataract (lens), following cataract surgery Sub-entries H59.02 Non-billable retained foreign body see Retained, foreign body fragments (type of)
Frailty (frail) Sub-entries R54 Frambesia, frambesial (tropica) Sub-entries see also Yaws
initial lesion or ulcer
A66.0 Frambeside Sub-entries
Franceschetti-Klein (-Wildervanck) disease or syndrome Code Q75.4 Francis' disease Cross-ref See: Tularemia Franklin disease Code C88.2 Non-billable Frank's essential thrombocytopenia Code D69.3 Fraser's syndrome Code Q87.0 Freckle (s) Sub-entries L81.2 malignant melanoma in see Melanoma
melanotic (Hutchinson's) see Melanoma, in situ
Frederickson's hyperlipoproteinemia, type Sub-entries
Freeman Sheldon syndrome Code Q87.0 Freezing Code T69.9 Non-billable See also: Effect, adverse, cold Freiberg's disease (infraction of metatarsal head or osteochondrosis) Cross-ref See: Osteochondrosis, juvenile, metatarsus Fremitus, friction, cardiac Code R01.2 Frenum, frenulum Sub-entries
tongue (shortening) (congenital)
Q38.1 Frequency micturition (nocturnal) Sub-entries R35.0 Frey's syndrome Sub-entries
Friction Sub-entries
Friderichsen-Waterhouse syndrome or disease Code A39.1 Friedländer's B (bacillus) NEC Code A49.8 See also: condition Friedreich's Sub-entries
combined systemic disease
G11.11 facial hemihypertrophy
Q67.4 sclerosis (cerebellum) (spinal cord)
G11.11 Fröhlich's syndrome Code E23.6 Frontal Sub-entries see also condition
with
partial thickness skin loss see Frostbite (superficial), by site
tissue necrosis
T34.90 Non-billable abdominal wall
T33.3 Non-billable Frozen Sub-entries T69.9 Non-billable see also Effect, adverse, cold shoulder see Capsulitis, adhesive
Fructokinase deficiency Code E74.11 Fructose 1,6 diphosphatase deficiency Code E74.19 Fructosemia (benign) (essential) Code E74.12 Fructosuria (benign) (essential) Code E74.11 Fuchs' Sub-entries
black spot (myopic)
H44.2 Non-billable see also Myopia, degenerative dystrophy (corneal endothelium)
H18.51 Non-billable heterochromic cyclitis see Cyclitis, Fuchs' heterochromic
hysterical (dissociative)
F44.1 postictal in epilepsy see Epilepsy
reaction to exceptional stress (transient)
F43.0 Fulminant, fulminating Cross-ref See: condition Functional Sub-entries see also condition
Functioning, intellectual, borderline Code R41.83 Fundus Cross-ref See: condition Fungemia NOS Sub-entries B49 Fungus, fungous Sub-entries
infection see Infection, fungus
Funiculitis (acute) (chronic) (endemic) Sub-entries N49.1 gonococcal (acute) (chronic)
A54.23 sequelae (late effect) of rickets
E64.3 FUO (fever of unknown origin) Code R50.9 Furrowed Sub-entries K14.5 nail (s) (transverse)
L60.4 ankle see Furuncle, lower limb
antecubital space see Furuncle, upper limb
Furunculosis Cross-ref See: Furuncle Fused Cross-ref See: Fusion, fused
Fusospirillosis (mouth) (tongue) (tonsil) Code A69.1 Source: Centers for Medicare & Medicaid Services, FY 2026 ICD-10-CM Index to Diseases and Injuries release files, effective October 1, 2025 through September 30, 2026.
