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

Sarah Tonga Underhill

Individual provider Behavior Technician · NPI 1679260335

Sarah Tonga Underhill is a Behavior Technician in Fullerton, California. Practices as a sole proprietor. Registered with an NPI since 2023.

In the registry since
2023

Practice location Address checks out

713 W Commonwealth Ave Ste C
Fullerton, CA 92832-1612
Phone: (714) 879-4274
Fax: (714) 879-2274
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Behavior Technician (primary) Taxonomy 106S00000X

Record details

NPI number1679260335
Entity typeIndividual (Type 1)
GenderFemale
Sole proprietorYes
NPI enumeratedApril 21, 2023
Last updated in NPPESApril 21, 2023
Certification dateApril 21, 2023
Mailing address713 W Commonwealth Ave, Fullerton, CA 92832-1612

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