Small intestinal bacterial overgrowth, hydrogen-subtype

This code identifies a specific type of small intestinal bacterial overgrowth (SIBO) characterized by an excessive amount of hydrogen-producing bacteria in the small intestine. Patients typically present with symptoms such as bloating, abdominal pain, diarrhea, and malabsorption. It is a distinct subtype of SIBO, differentiated by breath test results.

This code is appropriate when diagnostic testing, typically a lactulose or glucose breath test, confirms SIBO with a predominant hydrogen gas elevation. Documentation should clearly state "hydrogen-subtype SIBO" or indicate breath test results consistent with this diagnosis. It should be used when the specific gas produced by the overgrown bacteria has been identified.

• Ensure documentation explicitly states "hydrogen-subtype" or provides breath test results confirming hydrogen predominance.
• Do not use this code for general SIBO without specific subtype identification; use K63.82 for unspecified SIBO.
• Consider sequencing this code as the primary diagnosis when SIBO is the main reason for the encounter and treatment.