Valley Arthritis Care specializes in Rheumatology and Auto-Immune Disorders with our two locations conveniently located in Peoria and Sun City West. ... Patient Portal ... Friday: 8am to 2pm. Thursday: Closed . Office Location- Main Office. 13943 N. 91st Ave Building I . Peoria, AZ 85381. Office Location - Satellite Office. 13613 W. Camino Del ....