Gastroenterology ICD-10-CM codes

GERD is coded by esophagitis and bleeding status: K21.9 without esophagitis, K21.00 with esophagitis without bleeding, K21.01 with bleeding. Barrett's esophagus without dysplasia is K22.70 and replaces the GERD code once established, since it changes surveillance intervals. IBS requires the subtype when documented: K58.0 with diarrhea, K58.1 with constipation, K58.2 mixed, K58.9 without diarrhea.

Screening colonoscopy coding determines patient cost-sharing, so sequencing matters: Z12.11 (screening for colon malignancy) is first-listed for an asymptomatic screening even when a polyp is found and removed; the polyp (K63.5, or D12.6 for a confirmed benign adenoma) is coded additionally. A patient returning for surveillance because of prior adenomas gets Z86.0101 (personal history of adenomatous and serrated colon polyps) as the reason for the encounter. Symptomatic patients (K92.2 GI bleeding, R19.7 diarrhea, R10.31 right lower quadrant pain) are diagnostic, not screening.

Diverticular disease distinguishes diverticulosis (K57.30, large intestine without perforation, abscess, or bleeding) from diverticulitis (K57.92 when the site is unspecified); the bleeding and abscess variants change both the code and the expected level of service. For liver disease, K76.0 covers fatty liver, K74.60 unspecified cirrhosis, and abnormal liver function studies without a diagnosis are R94.5. Pancreatitis splits acute (K85.90, coded by cause when known) from chronic (K86.1).