ICD-10 Code K91.1 – Postgastric surgery syndromes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K91.1 – Postgastric surgery syndromes
What it is
K91.1 identifies postgastric surgery syndromes, a group of digestive problems that can occur after stomach surgery. Use it when the record documents a recognized postsurgical gastric syndrome rather than a routine postoperative state.
Clinical signs
Clinical features vary; refer to documentation. Commonly documented findings include symptoms related to altered gastric emptying or food intolerance after surgery, but you should code only what the provider states.
When to use this code
Use K91.1 when the provider diagnoses a postgastric surgery syndrome and links the patient’s symptoms to prior gastric surgery. It may apply in follow-up visits, specialty evaluations, or problem lists when the syndrome is active. Check documentation for the specific postoperative gastric complication described.
Do not use for
Do not use this code for uncomplicated recovery after surgery or for nonspecific abdominal complaints without a documented syndrome. If the chart names a different postoperative digestive complication, code that condition instead.
Coding tip
Confirm the surgeon’s or treating clinician’s exact wording, because “postoperative stomach symptoms” alone is not enough for K91.1.