Valley Arthritis Care. Physician Assistant (PA), Rheumatology • 5 Providers. 13943 N 91st Ave Ste I, Peoria AZ, 85381. Make an Appointment. Show Phone Number. Telehealth services available. Valley Arthritis Care is a medical group practice located in Peoria, AZ that specializes in Physician Assistant (PA) and Rheumatology..