**R19.7 — Diarrhoea, unspecified** is used when frequent loose or watery stools are the presenting symptom without an identified infectious agent or underlying disease.
For infectious diarrhea, more specific codes apply (A04-A09 bacterial/viral/parasitic). Functional/IBS-related diarrhea is K58.x. Chronic diarrhea typically gets re-coded post-workup.
Belongs to **Chapter R** — Symptoms, signs.
