Contact Us

There are many different ways to contact us at Prospect Medical Systems.

Prospect Medical Systems
600 City Parkway West, Suite 800
Orange, CA 92868

Member and prospective member inquiries

If you are a Prospect member or would like to become one, please call our Customer Service Department at 800-708-3230. Representatives are available weekdays between the hours of 8 a.m. and 5 p.m., Pacific Time. Bilingual representatives are available to assist you. You may also email us at

For individuals who are Medicare eligible, we also have our Seniors VIP Line at 877-619-5900, where bilingual representatives are available to assist you. Or you can email inquiries to

Members with hearing or speech impairments, please dial 711 for California Relay TTD/TTY assistance.

For provider inquiries (regarding eligibility, referrals or claims status), you can reach us at or 800-708-3230. Hours of operation are weekdays between the hours of 8 a.m. to 5 p.m., Pacific Time.
Management Services Organization (MSO) clients and prospective client inquiries
If you are currently an MSO client or are interested in exploring our MSO services, you can reach us at 800-703-3230 prompt 1 then 7 or via email at