BLOG: The AIG Coding Corner Gastric Ulcers: ICD-9-CM to ICD-10-CM by Madeline A. Meyer, January 6, 2015 Don't get an ulcer over this change, but in ICD-10-CM, there is no code specification for gastrointestinal ulcers with obstruction and without obstruction. ICD-10 provides categories for gastric ulcer (K25), duodenal ulcer (K26), peptic ulcer, site unspecified (K27), gastrojejunal [...]