Emergency medical services are provided by rangers on duty. Call 911 in case of an emergency.
Medical services are available year round, except some holidays, at Mammoth Clinic (307 344-7965). Services are also offered seasonally in the summer at Lake Clinic (307 242-7241) and at Old Faithful Clinic (307 545-7325).
All of these clinics are open to the public and are staffed and equipped for most medical emergencies as well as for routine care. Services include injury and illness treatment, x-rays, and some lab and pharmacy services.
If in-patient care or advanced services are required, the clinic staff can stabilize patients and arrange for appropriate transfer to a hospital outside the park.