| K50018 | Crohn's disease of small intestine with other complication |
| K50019 | Crohn's disease of small intestine with unspecified complications |
| K5010 | Crohn's disease of large intestine without complications |
| K50111 | Crohn's disease of large intestine with rectal bleeding |
| K50112 | Crohn's disease of large intestine with intestinal obstruction |
| K50113 | Crohn's disease of large intestine with fistula |
| K50114 | Crohn's disease of large intestine with abscess |
| K50118 | Crohn's disease of large intestine with other complication |
| K50119 | Crohn's disease of large intestine with unspecified complications |
| K5080 | Crohn's disease of both small and large intestine without complications |
| K50811 | Crohn's disease of both small and large intestine with rectal bleeding |
| K50812 | Crohn's disease of both small and large intestine with intestinal obstruction |
| K50813 | Crohn's disease of both small and large intestine with fistula |
| K50814 | Crohn's disease of both small and large intestine with abscess |
| K50818 | Crohn's disease of both small and large intestine with other complication |
| K50819 | Crohn's disease of both small and large intestine with unspecified complications |
| K5090 | Crohn's disease, unspecified, without complications |
| K50911 | Crohn's disease, unspecified, with rectal bleeding |
| K50912 | Crohn's disease, unspecified, with intestinal obstruction |
| K50913 | Crohn's disease, unspecified, with fistula |
| K50914 | Crohn's disease, unspecified, with abscess |
| K50918 | Crohn's disease, unspecified, with other complication |
| K50919 | Crohn's disease, unspecified, with unspecified complications |
| K5100 | Ulcerative (chronic) pancolitis without complications |
| K51011 | Ulcerative (chronic) pancolitis with rectal bleeding |
| K51012 | Ulcerative (chronic) pancolitis with intestinal obstruction |
| K51013 | Ulcerative (chronic) pancolitis with fistula |
| K51014 | Ulcerative (chronic) pancolitis with abscess |
| K51018 | Ulcerative (chronic) pancolitis with other complication |
| K51019 | Ulcerative (chronic) pancolitis with unspecified complications |
| K5120 | Ulcerative (chronic) proctitis without complications |
| K51211 | Ulcerative (chronic) proctitis with rectal bleeding |
| K51212 | Ulcerative (chronic) proctitis with intestinal obstruction |
| K51213 | Ulcerative (chronic) proctitis with fistula |
| K51214 | Ulcerative (chronic) proctitis with abscess |
| K51218 | Ulcerative (chronic) proctitis with other complication |
| K51219 | Ulcerative (chronic) proctitis with unspecified complications |
| K5130 | Ulcerative (chronic) rectosigmoiditis without complications |
| K51311 | Ulcerative (chronic) rectosigmoiditis with rectal bleeding |
| K51312 | Ulcerative (chronic) rectosigmoiditis with intestinal obstruction |
| K51313 | Ulcerative (chronic) rectosigmoiditis with fistula |
| K51314 | Ulcerative (chronic) rectosigmoiditis with abscess |
| K51318 | Ulcerative (chronic) rectosigmoiditis with other complication |
| K51319 | Ulcerative (chronic) rectosigmoiditis with unspecified complications |
| K5140 | Inflammatory polyps of colon without complications |
| K51411 | Inflammatory polyps of colon with rectal bleeding |
| K51412 | Inflammatory polyps of colon with intestinal obstruction |
| K51413 | Inflammatory polyps of colon with fistula |
| K51414 | Inflammatory polyps of colon with abscess |
| K51418 | Inflammatory polyps of colon with other complication |
| K51419 | Inflammatory polyps of colon with unspecified complications |
| K5150 | Left sided colitis without complications |
| K51511 | Left sided colitis with rectal bleeding |
| K51512 | Left sided colitis with intestinal obstruction |
| K51513 | Left sided colitis with fistula |
| K51514 | Left sided colitis with abscess |
| K51518 | Left sided colitis with other complication |
| K51519 | Left sided colitis with unspecified complications |
| K5180 | Other ulcerative colitis without complications |
| K51811 | Other ulcerative colitis with rectal bleeding |
| K51812 | Other ulcerative colitis with intestinal obstruction |
| K51813 | Other ulcerative colitis with fistula |
| K51814 | Other ulcerative colitis with abscess |
| K51818 | Other ulcerative colitis with other complication |
| K51819 | Other ulcerative colitis with unspecified complications |
| K5190 | Ulcerative colitis, unspecified, without complications |
| K51911 | Ulcerative colitis, unspecified with rectal bleeding |
| K51912 | Ulcerative colitis, unspecified with intestinal obstruction |
| K51913 | Ulcerative colitis, unspecified with fistula |
| K51914 | Ulcerative colitis, unspecified with abscess |
| K51918 | Ulcerative colitis, unspecified with other complication |
| K51919 | Ulcerative colitis, unspecified with unspecified complications |
| K520 | Gastroenteritis and colitis due to radiation |
| K521 | Toxic gastroenteritis and colitis |
| K5221 | Food protein-induced enterocolitis syndrome |
| K5222 | Food protein-induced enteropathy |
| K5229 | Other allergic and dietetic gastroenteritis and colitis |
| K523 | Indeterminate colitis |
| K5281 | Eosinophilic gastritis or gastroenteritis |
| K5282 | Eosinophilic colitis |
| K52831 | Collagenous colitis |
| K52832 | Lymphocytic colitis |
| K52838 | Other microscopic colitis |
| K52839 | Microscopic colitis, unspecified |
| K5289 | Other specified noninfective gastroenteritis and colitis |
| K529 | Noninfective gastroenteritis and colitis, unspecified |
| K55011 | Focal (segmental) acute (reversible) ischemia of small intestine |
| K55012 | Diffuse acute (reversible) ischemia of small intestine |
| K55019 | Acute (reversible) ischemia of small intestine, extent unspecified |
| K55021 | Focal (segmental) acute infarction of small intestine |
| K55022 | Diffuse acute infarction of small intestine |
| K55029 | Acute infarction of small intestine, extent unspecified |
| K55031 | Focal (segmental) acute (reversible) ischemia of large intestine |
| K55032 | Diffuse acute (reversible) ischemia of large intestine |
| K55039 | Acute (reversible) ischemia of large intestine, extent unspecified |
| K55041 | Focal (segmental) acute infarction of large intestine |
| K55042 | Diffuse acute infarction of large intestine |
| K55049 | Acute infarction of large intestine, extent unspecified |
| K55051 | Focal (segmental) acute (reversible) ischemia of intestine, part unspecified |
| K55052 | Diffuse acute (reversible) ischemia of intestine, part unspecified |
| K55059 | Acute (reversible) ischemia of intestine, part and extent unspecified |
| K55061 | Focal (segmental) acute infarction of intestine, part unspecified |
| K55062 | Diffuse acute infarction of intestine, part unspecified |
| K55069 | Acute infarction of intestine, part and extent unspecified |
| K551 | Chronic vascular disorders of intestine |
| K5520 | Angiodysplasia of colon without hemorrhage |
| K5521 | Angiodysplasia of colon with hemorrhage |
| K5530 | Necrotizing enterocolitis, unspecified |
| K5531 | Stage 1 necrotizing enterocolitis |
| K5532 | Stage 2 necrotizing enterocolitis |
| K5533 | Stage 3 necrotizing enterocolitis |
| K558 | Other vascular disorders of intestine |
| K559 | Vascular disorder of intestine, unspecified |
| K560 | Paralytic ileus |
| K561 | Intussusception |
| K562 | Volvulus |
| K563 | Gallstone ileus |
| K5641 | Fecal impaction |
| K5649 | Other impaction of intestine |
| K5650 | Intestinal adhesions [bands], unspecified as to partial versus complete obstruction |
| K5651 | Intestinal adhesions [bands], with partial obstruction |
| K5652 | Intestinal adhesions [bands] with complete obstruction |
| K56600 | Partial intestinal obstruction, unspecified as to cause |
| K56601 | Complete intestinal obstruction, unspecified as to cause |
| K56609 | Unspecified intestinal obstruction, unspecified as to partial versus complete obstruction |
| K56690 | Other partial intestinal obstruction |
| K56691 | Other complete intestinal obstruction |
| K56699 | Other intestinal obstruction unspecified as to partial versus complete obstruction |
| K567 | Ileus, unspecified |
| K5700 | Diverticulitis of small intestine with perforation and abscess without bleeding |
| K5701 | Diverticulitis of small intestine with perforation and abscess with bleeding |
| K5710 | Diverticulosis of small intestine without perforation or abscess without bleeding |
| K5711 | Diverticulosis of small intestine without perforation or abscess with bleeding |
| K5712 | Diverticulitis of small intestine without perforation or abscess without bleeding |
| K5713 | Diverticulitis of small intestine without perforation or abscess with bleeding |
| K5720 | Diverticulitis of large intestine with perforation and abscess without bleeding |
| K5721 | Diverticulitis of large intestine with perforation and abscess with bleeding |
| K5730 | Diverticulosis of large intestine without perforation or abscess without bleeding |
| K5731 | Diverticulosis of large intestine without perforation or abscess with bleeding |
| K5732 | Diverticulitis of large intestine without perforation or abscess without bleeding |
| K5733 | Diverticulitis of large intestine without perforation or abscess with bleeding |
| K5740 | Diverticulitis of both small and large intestine with perforation and abscess without bleeding |
| K5741 | Diverticulitis of both small and large intestine with perforation and abscess with bleeding |
| K5750 | Diverticulosis of both small and large intestine without perforation or abscess without bleeding |
| K5751 | Diverticulosis of both small and large intestine without perforation or abscess with bleeding |
| K5752 | Diverticulitis of both small and large intestine without perforation or abscess without bleeding |
| K5753 | Diverticulitis of both small and large intestine without perforation or abscess with bleeding |
| K5780 | Diverticulitis of intestine, part unspecified, with perforation and abscess without bleeding |
| K5781 | Diverticulitis of intestine, part unspecified, with perforation and abscess with bleeding |
| K5790 | Diverticulosis of intestine, part unspecified, without perforation or abscess without bleeding |
| K5791 | Diverticulosis of intestine, part unspecified, without perforation or abscess with bleeding |
| K5792 | Diverticulitis of intestine, part unspecified, without perforation or abscess without bleeding |
| K5793 | Diverticulitis of intestine, part unspecified, without perforation or abscess with bleeding |
| K580 | Irritable bowel syndrome with diarrhea |
| K581 | Irritable bowel syndrome with constipation |
| K582 | Mixed irritable bowel syndrome |
| K588 | Other irritable bowel syndrome |
| K589 | Irritable bowel syndrome without diarrhea |
| K5900 | Constipation, unspecified |
| K5901 | Slow transit constipation |
| K5902 | Outlet dysfunction constipation |
| K5903 | Drug induced constipation |
| K5904 | Chronic idiopathic constipation |
| K5909 | Other constipation |
| K591 | Functional diarrhea |
| K592 | Neurogenic bowel, not elsewhere classified |
| K5931 | Toxic megacolon |
| K5939 | Other megacolon |
| K594 | Anal spasm |
| K598 | Other specified functional intestinal disorders |
| K599 | Functional intestinal disorder, unspecified |
| K600 | Acute anal fissure |
| K601 | Chronic anal fissure |
| K602 | Anal fissure, unspecified |
| K603 | Anal fistula |
| K604 | Rectal fistula |
| K605 | Anorectal fistula |
| K610 | Anal abscess |
| K611 | Rectal abscess |
| K612 | Anorectal abscess |
| K6131 | Horseshoe abscess |
| K6139 | Other ischiorectal abscess |
| K614 | Intrasphincteric abscess |
| K615 | Supralevator abscess |
| K620 | Anal polyp |
| K621 | Rectal polyp |
| K622 | Anal prolapse |
| K623 | Rectal prolapse |
| K624 | Stenosis of anus and rectum |
| K625 | Hemorrhage of anus and rectum |
| K626 | Ulcer of anus and rectum |
| K627 | Radiation proctitis |
| K6281 | Anal sphincter tear (healed) (nontraumatic) (old) |
| K6282 | Dysplasia of anus |
| K6289 | Other specified diseases of anus and rectum |
| K629 | Disease of anus and rectum, unspecified |
| K630 | Abscess of intestine |
| K631 | Perforation of intestine (nontraumatic) |
| K632 | Fistula of intestine |
| K633 | Ulcer of intestine |
| K634 | Enteroptosis |
| K635 | Polyp of colon |
| K6381 | Dieulafoy lesion of intestine |
| K6389 | Other specified diseases of intestine |
| K639 | Disease of intestine, unspecified |
| K640 | First degree hemorrhoids |
| K641 | Second degree hemorrhoids |
| K642 | Third degree hemorrhoids |
| K643 | Fourth degree hemorrhoids |
| K644 | Residual hemorrhoidal skin tags |
| K645 | Perianal venous thrombosis |
| K648 | Other hemorrhoids |
| K649 | Unspecified hemorrhoids |
| K650 | Generalized (acute) peritonitis |
| K651 | Peritoneal abscess |
| K652 | Spontaneous bacterial peritonitis |
| K653 | Choleperitonitis |
| K654 | Sclerosing mesenteritis |
| K658 | Other peritonitis |
| K659 | Peritonitis, unspecified |
| K660 | Peritoneal adhesions (postprocedural) (postinfection) |
| K661 | Hemoperitoneum |
| K668 | Other specified disorders of peritoneum |
| K669 | Disorder of peritoneum, unspecified |
| K67 | Disorders of peritoneum in infectious diseases classified elsewhere |
| K6812 | Psoas muscle abscess |
| K6819 | Other retroperitoneal abscess |
| K689 | Other disorders of retroperitoneum |
| K900 | Celiac disease |
| K901 | Tropical sprue |
| K902 | Blind loop syndrome, not elsewhere classified |
| K903 | Pancreatic steatorrhea |
| K9041 | Non-celiac gluten sensitivity |
| K9049 | Malabsorption due to intolerance, not elsewhere classified |
| K9081 | Whipple's disease |
| K9089 | Other intestinal malabsorption |
| K909 | Intestinal malabsorption, unspecified |
| K910 | Vomiting following gastrointestinal surgery |
| K911 | Postgastric surgery syndromes |
| K912 | Postsurgical malabsorption, not elsewhere classified |
| K9130 | Postprocedural intestinal obstruction, unspecified as to partial versus complete |
| K9131 | Postprocedural partial intestinal obstruction |
| K9132 | Postprocedural complete intestinal obstruction |
| K9181 | Other intraoperative complications of digestive system |
| K9182 | Postprocedural hepatic failure |
| K9183 | Postprocedural hepatorenal syndrome |
| K91850 | Pouchitis |
| K91858 | Other complications of intestinal pouch |
| K9186 | Retained cholelithiasis following cholecystectomy |
| K9189 | Other postprocedural complications and disorders of digestive system |
| K920 | Hematemesis |
| K921 | Melena |
| K922 | Gastrointestinal hemorrhage, unspecified |
| K9281 | Gastrointestinal mucositis (ulcerative) |
| K9289 | Other specified diseases of the digestive system |
| K929 | Disease of digestive system, unspecified |
| K9400 | Colostomy complication, unspecified |
| K9401 | Colostomy hemorrhage |
| K9402 | Colostomy infection |
| K9403 | Colostomy malfunction |
| K9409 | Other complications of colostomy |
| K9410 | Enterostomy complication, unspecified |
| K9411 | Enterostomy hemorrhage |
| K9412 | Enterostomy infection |
| K9413 | Enterostomy malfunction |
| K9419 | Other complications of enterostomy |
| K9420 | Gastrostomy complication, unspecified |
| K9421 | Gastrostomy hemorrhage |
| K9422 | Gastrostomy infection |
| K9423 | Gastrostomy malfunction |
| K9429 | Other complications of gastrostomy |
| K9430 | Esophagostomy complications, unspecified |
| K9431 | Esophagostomy hemorrhage |
| K9432 | Esophagostomy infection |
| K9433 | Esophagostomy malfunction |
| K9439 | Other complications of esophagostomy |
| K9501 | Infection due to gastric band procedure |
| K9509 | Other complications of gastric band procedure |
| K9581 | Infection due to other bariatric procedure |
| K9589 | Other complications of other bariatric procedure |
| N805 | Endometriosis of intestine |
| N822 | Fistula of vagina to small intestine |
| N823 | Fistula of vagina to large intestine |
| N824 | Other female intestinal-genital tract fistulae |
| N994 | Postprocedural pelvic peritoneal adhesions |
| Q385 | Congenital malformations of palate, not elsewhere classified |
| Q390 | Atresia of esophagus without fistula |
| Q391 | Atresia of esophagus with tracheo-esophageal fistula |
| Q392 | Congenital tracheo-esophageal fistula without atresia |
| Q393 | Congenital stenosis and stricture of esophagus |
| Q394 | Esophageal web |
| Q395 | Congenital dilatation of esophagus |
| Q396 | Congenital diverticulum of esophagus |
| Q398 | Other congenital malformations of esophagus |
| Q399 | Congenital malformation of esophagus, unspecified |
| Q400 | Congenital hypertrophic pyloric stenosis |
| Q401 | Congenital hiatus hernia |
| Q402 | Other specified congenital malformations of stomach |
| Q403 | Congenital malformation of stomach, unspecified |
| Q408 | Other specified congenital malformations of upper alimentary tract |
| Q409 | Congenital malformation of upper alimentary tract, unspecified |
| Q410 | Congenital absence, atresia and stenosis of duodenum |
| Q411 | Congenital absence, atresia and stenosis of jejunum |
| Q412 | Congenital absence, atresia and stenosis of ileum |
| Q418 | Congenital absence, atresia and stenosis of other specified parts of small intestine |
| Q419 | Congenital absence, atresia and stenosis of small intestine, part unspecified |
| Q420 | Congenital absence, atresia and stenosis of rectum with fistula |
| Q421 | Congenital absence, atresia and stenosis of rectum without fistula |
| Q422 | Congenital absence, atresia and stenosis of anus with fistula |
| Q423 | Congenital absence, atresia and stenosis of anus without fistula |
| Q428 | Congenital absence, atresia and stenosis of other parts of large intestine |
| Q429 | Congenital absence, atresia and stenosis of large intestine, part unspecified |
| Q430 | Meckel's diverticulum (displaced) (hypertrophic) |
| Q431 | Hirschsprung's disease |
| Q432 | Other congenital functional disorders of colon |
| Q433 | Congenital malformations of intestinal fixation |
| Q434 | Duplication of intestine |
| Q435 | Ectopic anus |
| Q436 | Congenital fistula of rectum and anus |
| Q437 | Persistent cloaca |
| Q438 | Other specified congenital malformations of intestine |
| Q439 | Congenital malformation of intestine, unspecified |
| Q458 | Other specified congenital malformations of digestive system |
| Q459 | Congenital malformation of digestive system, unspecified |
| Q792 | Exomphalos |
| Q793 | Gastroschisis |
| Q794 | Prune belly syndrome |
| Q7951 | Congenital hernia of bladder |
| Q7959 | Other congenital malformations of abdominal wall |
| Q893 | Situs inversus |
| Q894 | Conjoined twins |
| R100 | Acute abdomen |
| R1010 | Upper abdominal pain, unspecified |
| R1011 | Right upper quadrant pain |
| R1012 | Left upper quadrant pain |
| R1013 | Epigastric pain |
| R102 | Pelvic and perineal pain |
| R1030 | Lower abdominal pain, unspecified |
| R1031 | Right lower quadrant pain |
| R1032 | Left lower quadrant pain |
| R1033 | Periumbilical pain |
| R10811 | Right upper quadrant abdominal tenderness |
| R10812 | Left upper quadrant abdominal tenderness |
| R10813 | Right lower quadrant abdominal tenderness |
| R10814 | Left lower quadrant abdominal tenderness |
| R10815 | Periumbilic abdominal tenderness |
| R10816 | Epigastric abdominal tenderness |
| R10817 | Generalized abdominal tenderness |
| R10819 | Abdominal tenderness, unspecified site |
| R10821 | Right upper quadrant rebound abdominal tenderness |
| R10822 | Left upper quadrant rebound abdominal tenderness |
| R10823 | Right lower quadrant rebound abdominal tenderness |
| R10824 | Left lower quadrant rebound abdominal tenderness |
| R10825 | Periumbilic rebound abdominal tenderness |
| R10826 | Epigastric rebound abdominal tenderness |
| R10827 | Generalized rebound abdominal tenderness |
| R10829 | Rebound abdominal tenderness, unspecified site |
| R1083 | Colic |
| R1084 | Generalized abdominal pain |
| R109 | Unspecified abdominal pain |
| R110 | Nausea |
| R1110 | Vomiting, unspecified |
| R1111 | Vomiting without nausea |
| R1112 | Projectile vomiting |
| R1113 | Vomiting of fecal matter |
| R1114 | Bilious vomiting |
| R1115 | Cyclical vomiting syndrome unrelated to migraine |
| R112 | Nausea with vomiting, unspecified |
| R12 | Heartburn |
| R130 | Aphagia |
| R1310 | Dysphagia, unspecified |
| R1311 | Dysphagia, oral phase |
| R1312 | Dysphagia, oropharyngeal phase |
| R1313 | Dysphagia, pharyngeal phase |
| R1314 | Dysphagia, pharyngoesophageal phase |
| R1319 | Other dysphagia |
| R140 | Abdominal distension (gaseous) |
| R141 | Gas pain |
| R142 | Eructation |
| R143 | Flatulence |
| R150 | Incomplete defecation |
| R151 | Fecal smearing |
| R152 | Fecal urgency |
| R159 | Full incontinence of feces |
| R1900 | Intra-abdominal and pelvic swelling, mass and lump, unspecified site |
| R1901 | Right upper quadrant abdominal swelling, mass and lump |
| R1902 | Left upper quadrant abdominal swelling, mass and lump |
| R1903 | Right lower quadrant abdominal swelling, mass and lump |
| R1904 | Left lower quadrant abdominal swelling, mass and lump |
| R1905 | Periumbilic swelling, mass or lump |
| R1906 | Epigastric swelling, mass or lump |
| R1907 | Generalized intra-abdominal and pelvic swelling, mass and lump |
| R1909 | Other intra-abdominal and pelvic swelling, mass and lump |
| R1911 | Absent bowel sounds |
| R1912 | Hyperactive bowel sounds |
| R1915 | Other abnormal bowel sounds |
| R192 | Visible peristalsis |
| R1930 | Abdominal rigidity, unspecified site |
| R1931 | Right upper quadrant abdominal rigidity |
| R1932 | Left upper quadrant abdominal rigidity |
| R1933 | Right lower quadrant abdominal rigidity |
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