AHA Coding Clinic® for ICD-10-CM and ICD-10-PCS - 2023 Issue 4; New/Revised ICD-10-CM Codes

Intestinal Microbial Overgrowth

Subcategory K63.82, Intestinal microbial overgrowth, has been created to capture distinct types of intestinal microbial overgrowth diseases. The new codes are as follows: • K63.8211, Small intestinal bacterial overgrowth, hydrogen-subtype • K63.8212, Small intestinal bacterial overgrowth, hydrogen sulfide-subtype • K63.8219, Small intestinal bacterial overgrowth, unspecified • K63.822, Small intestinal fungal overgrowth • K63.829, Intestinal methanogen overgrowth, unspecified  Intestinal microbial overgrowth diseases are the result of overpopulation of bacteria, methanogenic archaea or fungi in the intestine that can lead to debilitating symptoms. There are several types of intestinal microbial overgrowth diseases, including small intestinal...

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