ICD-10-CM 2027
ICD-10 code for diarrhea
Confirmed by the official ICD-10-CM index entry “diarrhea, diarrheal (disease) (infantile) (inflammatory)”. Page updated September 29, 2026.
About coding diarrhea
The ICD-10-CM code for diarrhea is R19.7 (Diarrhea, unspecified). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on R19.7.
Within R19, choose R19.7 (Diarrhea, unspecified) only when documentation doesn't support a more specific option: intra-abdominal and pelvic swelling, mass and lump (R19.0), abnormal bowel sounds (R19.1), visible peristalsis (R19.2), abdominal rigidity (R19.3), change in bowel habit (R19.4), other fecal abnormalities (R19.5), Halitosis (R19.6) and other specified symptoms and signs involving the digestive system and abdomen (R19.8).
Don't report R19.7 together with the conditions in its Excludes1 note: functional diarrhea (K59.1), neonatal diarrhea (P78.3) and psychogenic diarrhea (F45.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Related Diarrhea codes
- A09 Infectious gastroenteritis and colitis, unspecified
Don't confuse with (Excludes1 for R19.7)
Common questions about diarrhea ICD-10 codes
What is the ICD-10 code for diarrhea?
- R19.7 — Diarrhea, unspecified. More specific codes apply when the documentation supports them: A09.
What is the ICD-10 code for infectious gastroenteritis and colitis, unspecified?
- A09 — Infectious gastroenteritis and colitis, unspecified.
Is R19.7 billable?
- Yes. R19.7 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R19.7 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R19.7 as a principal diagnosis.
Is R19.7 a CC or MCC?
- No. R19.7 is neither a CC nor an MCC under MS-DRG v44.0.