Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Mr. William Alfred Degroot III, MFT

Individual provider Marriage & Family Therapist · NPI 1871511857

Mr. William Alfred Degroot III, MFT is a Marriage & Family Therapist in Corona, California. Practices as a sole proprietor. Licensed in California.

Licensed in
CA
In the registry since
2006
What do these letters mean?
MFT — Marriage and Family Therapist
A therapist who treats couples and families.

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Practice location Address checks out

1901 W Ontario Ave
Corona, CA 92882-5632
Phone: (951) 733-4217
Fax: (951) 737-6257
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Marriage & Family Therapist (primary) Taxonomy 106H00000X · Licence MF18816 (CA)

Record details

NPI number1871511857
Entity typeIndividual (Type 1)
GenderMale
Credentials MFT
Sole proprietorYes
NPI enumeratedJuly 17, 2006
Last updated in NPPESSeptember 7, 2010

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