William Degroot III, MFT
NPI 1871511857 · Marriage & Family Therapist · Corona, CA
William Degroot III, MFT is a Marriage & Family Therapist provider in Corona, CA (NPI 1871511857).
Provider details
- NPI number
- 1871511857
- Entity type
- Individual
- Primary specialty
- Marriage & Family TherapistBehavioral Health & Social Service Providers
- Credential
- MFT
- Sex
- Male
- Sole proprietor
- Yes
- License
- MF18816 (CA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-17
- Last updated
- 2010-09-07
Frequently asked questions
- What is William Degroot III's NPI number?
- William Degroot III's National Provider Identifier (NPI) is 1871511857, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Degroot III's specialty?
- William Degroot III is listed in the NPPES registry with a primary specialty of Marriage & Family Therapist (Behavioral Health & Social Service Providers).
- Where is William Degroot III located?
- William Degroot III's practice location on file with NPPES is 1901 West Ontario Ave, Corona, CA 92882-5632.
- What is William Degroot III's phone number?
- The practice phone number listed in the NPPES registry for William Degroot III is (951) 733-4217.
- Is William Degroot III's NPI active?
- Yes — William Degroot III's NPI (1871511857) is active in the NPPES registry as of the last update on 2010-09-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.