Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Diana Seunghye On, LCSW

Individual provider Mental Health Counselor · NPI 1033346705

Diana Seunghye On, LCSW is a Mental Health Counselor in Chino Hills, California. Practices as a sole proprietor. Licensed in California.

Licensed in
CA
In the registry since
2009
Specialties on file
2
What do these letters mean?
LCSW — Licensed Clinical Social Worker
A social worker licensed to diagnose and treat mental health conditions independently.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

5939 Crestmont Dr
Chino Hills, CA 91709-3252
Phone: (626) 664-0462
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Social Worker (primary) Taxonomy 1041C0700X · Licence 80518 (CA)
Mental Health Counselor Taxonomy 101YM0800X · Licence ACSW35310 (CA)

Record details

NPI number1033346705
Entity typeIndividual (Type 1)
GenderFemale
Credentials LCSW
Sole proprietorYes
NPI enumeratedJune 19, 2009
Last updated in NPPESJuly 10, 2024
Certification dateJuly 10, 2024

Other providers in Chino Hills