Excludes1 pair
K58.0 vs K59.1
K58.0 and K59.1 are not coded together. ICD-10-CM declares them mutually exclusive with an Excludes1 note — the two conditions are not expected to occur together, so exactly one of them is normally correct for a given encounter. The Official Guidelines carve out one exception: if the two conditions are clearly unrelated to each other, both may be reported.
The official note, declared on K59.1
irritable bowel syndrome with diarrhea (K58.0)
K58.0
Irritable bowel syndrome with diarrhea
Billable
- Chapter 11
- Diseases of the digestive system
- Section
- K55-K64
Indexed under
- Colic › mucous › with diarrhea
- Colitis › spastic › with diarrhea
- Irritable, irritability › colon › with diarrhea
- Spasm, spastic, spasticity › colon › with diarrhea
- Irritable, irritability › bowel › with › diarrhea
K59.1
Functional diarrhea
Billable
- Chapter 11
- Diseases of the digestive system
- Section
- K55-K64
Indexed under
- Diarrhea, diarrheal › functional
- Diarrhea, diarrheal › neurogenic
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027