K59.1
BillableFunctional diarrhea
K59.1 is the ICD-10-CM code for Functional diarrhea. It is a billable, specific code valid for reimbursement.
K00-K95 Diseases of the digestive system
What this means — in plain language
MedlinePlus · NIHWhat is diarrhea? Diarrhea is loose, watery stools (bowel movements). You have diarrhea if you have loose stools three or more times in one day. Acute diarrhea is diarrhea that lasts a short time. It is a common problem. It usually lasts about one or two days, but it may last longer. Then it goes away on its own. Diarrhea lasting more than a few days may be a sign of a more serious problem. Chronic diarrhea --…
Read more about Diarrhea at MedlinePlus ↗Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.
Medications indicated for this condition
FDA labeling- Hyoscyamine›
- PrucaloprideSerotonin-4 Receptor Agonist [EPC]›
- LubiprostoneChloride Channel Activator [EPC]›
- Difenoxin and Atropine Sulfate›
- Hyoscyamine Sulfate Sublingual›
- LinaclotideGuanylate Cyclase-C Agonist [EPC]›
- Naldemedine›
- Naloxegol›
Drugs whose FDA labeling lists this condition's category among its indications. Informational only — not a treatment recommendation or medical advice.
Conditions mapped to this code
MedlinePlus · NIHPlain-language health-topic references grounded in MedlinePlus (NIH/NLM).
Frequently asked questions
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
Look up another ICD-10 code or condition