Hi CoutneyB,
If I remember correctly, you are in Tracy, CA area? We are in San Joaquin county also, and my DS9 was evaluated and diagnosed with ASD through Valley Mountain Regional Center in Stockton,CA.
http://www.vmrc.net/
They provide free assessment and diagnosis services, and if you are qualified, you get free ongoing supports and services.

My son was evaluated by his Developmental Ped, clinical psychologist and Pediatric Neurologist at first, but he did not meet the criteria for autism spectrum disorder. Since he was totally nonverbal at that time, and we desperately needed some kind of intervention(service) for him, we pursued further evaluations through them.