I received my diagnosis through Prosper Health. I'm on medi-cal and unfortunately had to pay out of pocket, but I believe it was worth it ($950). It was 3 online sessions - 2 for assessment and 1 to go over their diagnosis, reasoning, and next step options. The doctor assessing me was so kind and patient, and the assessment and results were very well presented.

At the end you're given a copy of their assessment (many pages which detail how your answers to their questions tie into their diagnosis), a simple one page official diagnosis that you can provide to employers, other healthcare providers, or resources that might need one, and a signed note that you can give to employers asking for certain accommodations.

Part of their process is providing the name and email of two people in the person's life who will be sent a questionnaire that asks them questions relating to autism. You are supposed to allow them to answer the questions without telling them what it's for to avoid bias. Ideally they request one person who has known them since childhood and another who is close to them now.