51 therapists with a practice address in Diamond Bar, from the federal NPI Registry. Alphabetical by last name. Tap a name for the address, phone number and NPI record.
51therapists
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NPI records don't show insurance, openings or telehealth. Call the office to confirm those before you book.
Licensed therapists: psychologists, counselors, clinical social workers and marriage & family therapists. All provide talk therapy; none of the non-psychologists can do formal psychological testing.
Before you call
Ask whether they're taking new patients, which insurance plans they're in, what a session costs without insurance, and whether they see people by video. You can check any clinician's license with your state licensing board, and their NPI record at the CMS NPI Registry.
The NPI Registry lists 51 therapists with a practice address in Diamond Bar. Some work only inside a hospital, clinic or school, and a few may have retired without closing their NPI, so the number seeing new patients is lower.
Do these therapists take insurance?
NPI records don't include insurance. Call the office or check your insurer's directory. How coverage works.
How is this list ordered?
Alphabetically by last name. Nobody pays to be listed or to appear higher.
Listings come from the CMS National Plan and Provider Enumeration System (NPI Registry), October 2026 copy. A listing is not a recommendation. Nobody pays to appear here or to rank higher; lists are alphabetical by last name. This page is general information, not medical advice. How we verify