K63.821
Small intestinal bacterial overgrowth
Non-billable headerNot valid on its own. Use one of the more specific codes under it.
K63.821 is a non-billable ICD-10-CM code header for small intestinal bacterial overgrowth. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are K63.8211 Small intestinal bacterial overgrowth, hydrogen-subtype; K63.8212 Small intestinal bacterial overgrowth, hydrogen sulfide-subtype and K63.8219 Small intestinal bacterial overgrowth, unspecified. Its coding notes include 8 Excludes2 entries.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (8 notes)
Inherited from Chapter 11 Diseases of the digestive system
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)