Action Urgent Care in Mammoth Lakes, CA is at your service. Feel free to stop by our walk-in clinic. Services our Mammoth Lakes emergency care offers are: Urgent Care, Primary Care, Walk-In Clinic, Injury and Disease Treatment, Family Medicine, Family Doctor, Primary Care Doctor, Family Physician, Pediatric Care, Internal Medicine, Workers Compensation, Physicals, Vaccinations, EKG, Dermatology, X-Ray, Ultrasound, Diagnostic Lab Services and Allergy Testing.