- Gain in weight (abnormal) (excessive)
- Gaisböck\’s disease (polycythemia hypertonica), D75.1
- Gait abnormality, R26.9
- Galactocele (breast), N64.89
- Galactokinase deficiency, E74.29
- Galactophoritis, N61.0
- Galactorrhea, O92.6
- Galactosemia (classic) (congenital), E74.21
- Galactosuria, E74.29
- Galacturia, R82.0
- GALD (gestational alloimmune liver disease), P78.84
- Galeazzi\’s fracture, S52.37-
- Galen\’s vein
- Galeophobia, F40.218
- Gall duct
- Gallbladder
- Gallop rhythm, R00.8
- Gallstone (colic) (cystic duct) (gallbladder) (impacted) (multiple)
- Gambling, Z72.6
- Gammopathy (of undetermined significance [MGUS]), D47.2
- Gamna\’s disease (siderotic splenomegaly), D73.1
- Gamophobia, F40.298
- Gampsodactylia (congenital), Q66.7-
- Gamstorp\’s disease (adynamia episodica hereditaria), G72.3
- Gandy-Nanta disease (siderotic splenomegaly), D73.1
- Gang
- Gangliocytoma, D36.10
- Ganglioglioma
- Ganglion (compound) (diffuse) (joint) (tendon (sheath)), M67.40
- Ganglioneuroblastoma
- Ganglioneuroma, D36.10
- Ganglioneuromatosis, D36.10
- Ganglionitis
- Gangliosidosis, E75.10
- Gangosa, A66.5
- Gangrene, gangrenous (connective tissue) (dropsical) (dry) (moist) (skin) (ulcer), I96
- Ganister disease, J62.8
- Ganser\’s syndrome (hysterical), F44.89
- Gardner-Diamond syndrome (autoerythrocyte sensitization), D69.2
- Gargoylism, E76.01
- Garré\’s disease, osteitis, osteomyelitis (sclerosing)
- Garrod\’s pad, knuckle, M72.1
- Gartner\’s duct
- Gas, R14.3
- Gastralgia
- Gastrectasis, K31.0
- Gastric
- Gastrinoma
- Gastritis (simple), K29.70
- Gastrocarcinoma
- Gastrocolic
- Gastrodisciasis, gastrodiscoidiasis, B66.8
- Gastroduodenitis, K29.90
- Gastrodynia
- Gastroenteritis (acute) (chronic) (noninfectious), K52.9
- Gastroenteropathy, K52.9
- Gastroenteroptosis, K63.4
- Gastroesophageal laceration- hemorrhage syndrome, K22.6
- Gastrointestinal
- Gastrojejunal
- Gastrojejunitis, K52.9
- Gastrojejunocolic
- Gastroliths, K31.89
- Gastromalacia, K31.89
- Gastroparalysis, K31.84
- Gastroparesis, K31.84
- Gastropathy, K31.9
- Gastroptosis, K31.89
- Gastrorrhagia, K92.2
- Gastroschisis (congenital), Q79.3
- Gastrospasm (neurogenic) (reflex), K31.89
- Gastrostaxis
- Gastrostenosis, K31.89
- Gastrostomy
- Gastrosuccorrhea (continuous) (intermittent), K31.89
- Gatophobia, F40.218
- Gaucher\’s disease or splenomegaly (adult) (infantile), E75.22
- Gélineau\’s syndrome, G47.419
- Gee (-Herter)(-Thaysen) disease (nontropical sprue), K90.0
- Gemination, tooth, teeth, K00.2
- Gemistocytoma
- General, generalized
- Genetic
- Genital
- Genito-anorectal syndrome, A55
- Genitourinary system
- Genu
- Geographic tongue, K14.1
- Geophagia
- Geotrichosis, B48.3
- Gephyrophobia, F40.242
- Gerbode defect, Q21.0
- GERD (gastroesophageal reflux disease), K21.9
- Gerhardt\’s
- German measles
- Germinoblastoma (diffuse), C85.9-
- Germinoma
- Gerontoxon
- Gerstmann-Sträussler-Scheinker syndrome (GSS), A81.82
- Gerstmann\’s syndrome, R48.8
- Gestation (period)
- Gestational
- Ghon tubercle, primary infection, A15.7
- Ghost
- Ghoul hand, A66.3
- Gianotti-Crosti disease, L44.4
- Giant
- Giardiasis, A07.1
- Gibert\’s disease or pityriasis, L42
- Giddiness, R42
- Gierke\’s disease (glycogenosis I), E74.01
- Gigantism (cerebral) (hypophyseal) (pituitary), E22.0
- Gilbert\’s disease or syndrome, E80.4
- Gilchrist\’s disease, B40.9
- Gilford-Hutchinson disease, E34.8
- Gilles de la Tourette\’s disease or syndrome (motor-verbal tic), F95.2
- Gingivitis, K05.10
- Gingivoglossitis, K14.0
- Gingivopericementitis
- Gingivosis
- Gingivostomatitis, K05.10
- Gland, glandular
- Glanders, A24.0
- Glanzmann disease or thrombasthenia (-Naegeli), D69.1
- Glasgow coma scale
- Glass-blower\’s disease (cataract)
- Glaucoma, H40.9
- Glaucomatous flecks (subcapsular)
- Glazed tongue, K14.4
- Glénard\’s disease, K63.4
- Gleet (gonococcal), A54.01
- Glioblastoma (multiforme)
- Glioma (malignant)
- Gliomatosis cerebri, C71.0
- Glioneuroma
- Gliosarcoma
- Gliosis (cerebral), G93.89
- Glisson\’s disease
- Globinuria, R82.3
- Globus (hystericus), F45.8
- Glomangioma, D18.00
- Glomangiomyoma, D18.00
- Glomangiosarcoma
- Glomerular
- Glomerulitis
- Glomerulonephritis, N05.9
- Glomerulopathy
- Glomerulosclerosis
- Glossagra, K14.6
- Glossalgia, K14.6
- Glossitis (chronic superficial) (gangrenous) (Moeller\’s), K14.0
- Glossocele, K14.8
- Glossodynia, K14.6
- Glossoncus, K14.8
- Glossopathy, K14.9
- Glossophytia, K14.3
- Glossoplegia, K14.8
- Glossoptosis, K14.8
- Glossopyrosis, K14.6
- Glossotrichia, K14.3
- Glossy skin, L90.8
- Glottis
- Glottitis, J04.0
- Glucagonoma
- Glucoglycinuria, E72.51
- Glucose-galactose malabsorption, E74.39
- Glue
- GLUT1 deficiency syndrome 1, infantile onset, E74.810
- GLUT1 deficiency syndrome 2, childhood onset, E74.810
- Glutaric aciduria, E72.3
- Glycinemia, E72.51
- Glycinuria (renal) (with ketosis), E72.09
- Glycogen
- Glycogenosis (diffuse) (generalized)
- Glycopenia, E16.2
- Glycosuria, R81
- Gnathostoma spinigerum (infection) (infestation), gnathostomiasis (wandering swelling), B83.1
- Goiter (plunging) (substernal), E04.9
- Goiter-deafness syndrome, E07.1
- Goldberg syndrome, Q89.8
- Goldberg-Maxwell syndrome, E34.51
- Goldblatt\’s hypertension or kidney, I70.1
- Goldenhar syndrome (-Gorlin), Q87.0
- Goldflam-Erb disease or syndrome, G70.00
- Goldscheider\’s disease, Q81.8
- Goldstein\’s disease (familial hemorrhagic telangiectasia), I78.0
- Golfer\’s elbow
- Gonadoblastoma
- Gonecystitis
- Gongylonemiasis, B83.8
- Goniosynechiae
- Gonococcemia, A54.86
- Gonococcus, gonococcal (disease) (infection), A54.9
- Gonocytoma
- Gonorrhea (acute) (chronic), A54.9
- Goodall\’s disease, A08.19
- Goodpasture\’s syndrome, M31.0
- Gopalan\’s syndrome (burning feet), E53.0
- Gorlin-Chaudry-Moss syndrome, Q87.0
- Gottron\’s papules, L94.4
- Gougerot-Blum syndrome (pigmented purpuric lichenoid dermatitis), L81.7
- Gougerot-Carteaud disease or syndrome (confluent reticulate papillomatosis), L83
- Gougerot\’s syndrome (trisymptomatic), L81.7
- Gouley\’s syndrome (constrictive pericarditis), I31.1
- Goundou, A66.6
- Gout, chronic, M1A.9
- Gout, gouty (acute) (attack) (flare), M10.9
- Gower\’s
- Gradenigo\’s syndrome
- Graefe\’s disease
- Graft-versus-host disease, D89.813
- Grain mite (itch), B88.0
- Grainhandler\’s disease or lung, J67.8
- Grand mal
- Grand multipara status only (not pregnant), Z64.1
- Granite worker\’s lung, J62.8
- Granular
- Granulation tissue (abnormal) (excessive), L92.9
- Granulocytopenia (primary) (malignant)
- Granuloma, L92.9
- Granulomatosis, L92.9
- Granulomatous tissue (abnormal) (excessive), L92.9
- Granulosis rubra nasi, L74.8
- Graphite fibrosis (of lung), J63.3
- Graphospasm, F48.8
- Grating scapula, M89.8X1
- Gravel (urinary)
- Graves\’ disease
- Gravis
- Grawitz tumor, C64.-
- Gray syndrome (newborn), P93.0
- Grayness, hair (premature), L67.1
- Green sickness, D50.8
- Greenfield\’s disease
- Greenstick fracture – code as Fracture, by site
- Grey syndrome (newborn), P93.0
- Grief, F43.21
- Griesinger\’s disease, B76.0
- Grinder\’s lung or pneumoconiosis, J62.8
- Grinding, teeth
- Grip
- Grippe, grippal
- Grisel\’s disease, M43.6
- Groin
- Grooved tongue, K14.5
- Ground itch, B76.9
- Grover\’s disease or syndrome, L11.1
- Growing pains, children, R29.898
- Growth (fungoid) (neoplastic) (new)
- Gruby\’s disease, B35.0
- Gubler-Millard paralysis or syndrome, G46.3
- Guerin-Stern syndrome, Q74.3
- Guidance, insufficient anterior (occlusal), M26.54
- Guillain-Barré disease or syndrome, G61.0
- Guinea worms (infection) (infestation), B72
- Guinon\’s disease (motor-verbal tic), F95.2
- Gull\’s disease, E03.4
- Gum
- Gumboil, K04.7
- Gumma (syphilitic), A52.79
- Gunn\’s syndrome, Q07.8
- Gunshot wound
- Gynandrism, Q56.0
- Gynandroblastoma
- Gynecological examination (periodic) (routine), Z01.419
- Gynecomastia, N62
- Gynephobia, F40.291
- Gyrate scalp, Q82.8