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🫃 Chapter 11 · K00-K95

Digestive System Diagnosis Codes

Digestive system codes document conditions affecting your mouth, esophagus, stomach, intestines, liver, gallbladder, and pancreas. From GERD and IBS to appendicitis and liver disease, these codes help manage both acute and chronic GI conditions.

About This Chapter

Chapter 11 of the ICD-10-CM classification covers diseases of the digestive system, spanning codes K00-K95. These codes are used by healthcare providers to document diagnoses in your electronic health record (EHR), on insurance claims, and on medical bills.

Why this matters: If you see a code starting with K on your medical bill or health records, it likely falls in this chapter. Understanding what chapter your code belongs to can help you make sense of your diagnosis and ask better questions at your next appointment.

Diagnosis Codes in This Chapter

Browse the 67 diagnosis codes we currently cover in this chapter. Select any code to read a plain-English explanation.

K02.9Dental Caries (Cavities) K04.7Periapical Abscess K05.10Chronic Gingivitis K08.109Complete Loss of Teeth K11.20Sialoadenitis (Salivary Gland Inflammation... K12.1Stomatitis (Mouth Inflammation) K13.70Leukoplakia of Oral Mucosa K14.0Glossitis (Tongue Inflammation) K20.9Esophagitis, Unspecified K21.0Gastroesophageal Reflux with Esophagitis... K21.9Gastroesophageal Reflux (GERD) K22.70Barrett Esophagus K25.9Gastric Ulcer K26.9Duodenal Ulcer K27.9Peptic Ulcer K29.00Acute Gastritis K29.70Gastritis, Unspecified K30Functional Dyspepsia K31.89Other Diseases of Stomach K35.80Acute Appendicitis K37Unspecified Appendicitis K40.20Bilateral Inguinal Hernia K40.90Inguinal Hernia K42.9Umbilical Hernia K43.9Ventral Hernia K44.9Diaphragmatic Hernia (Hiatal Hernia)... K46.9Abdominal Hernia K50.00Crohn Disease of Small Intestine... K50.90Crohn Disease, Unspecified K51.90Ulcerative Colitis K52.9Noninfective Gastroenteritis K55.9Vascular Disorder of Intestine K56.60Intestinal Obstruction K57.30Diverticulosis of Large Intestine... K58.0Irritable Bowel Syndrome With Diarrhea... K58.9Irritable Bowel Syndrome Without Diarrhea... K58Irritable Bowel Syndrome K59.00Constipation, Unspecified K59.04Chronic Idiopathic Constipation K60.0Acute Anal Fissure K61.0Anal Abscess K62.5Hemorrhage of Anus and Rectum K63.5Polyp of Colon K64.9Hemorrhoids K65.9Peritonitis K66.0Peritoneal Adhesions K70.0Alcoholic Fatty Liver K70.30Alcoholic Cirrhosis of Liver K71.9Toxic Liver Disease K72.90Hepatic Failure K73.9Chronic Hepatitis K74.60Cirrhosis of Liver K75.9Inflammatory Liver Disease K76.0Fatty Liver Disease K76.89Other Specified Diseases of Liver... K77Liver Disorders in Diseases Classified Elsewh... K80.00Calculus of Gallbladder with Acute Cholecy... K80.20Gallstones Without Obstruction K81.0Acute Cholecystitis K82.9Disease of Gallbladder K83.1Obstruction of Bile Duct K85.00Idiopathic Acute Pancreatitis K85.90Acute Pancreatitis K86.1Other Chronic Pancreatitis K90.0Celiac Disease K91.89Other Postprocedural Complications of Dige... K92.2Gastrointestinal Hemorrhage