William Sherwin
NPI 1780848374 · Marriage & Family Therapist · Rancho Santa Margarita, CA
William Sherwin is a Marriage & Family Therapist provider in Rancho Santa Margarita, CA (NPI 1780848374).
Provider details
- NPI number
- 1780848374
- Entity type
- Individual
- Primary specialty
- Marriage & Family TherapistBehavioral Health & Social Service Providers
- Sex
- Male
- Sole proprietor
- Yes
- License
- 49178 (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
17 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
- 2008-07-14
- Last updated
- 2025-09-25
- Certified
- 2025-09-25
Frequently asked questions
- What is William Sherwin's NPI number?
- William Sherwin's National Provider Identifier (NPI) is 1780848374, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Sherwin's specialty?
- William Sherwin is listed in the NPPES registry with a primary specialty of Marriage & Family Therapist (Behavioral Health & Social Service Providers).
- Where is William Sherwin located?
- William Sherwin's practice location on file with NPPES is 42 Calle Verano, Rancho Santa Margarita, CA 92688-2647.
- What is William Sherwin's phone number?
- The practice phone number listed in the NPPES registry for William Sherwin is (415) 940-5221.
- Is William Sherwin's NPI active?
- Yes — William Sherwin's NPI (1780848374) is active in the NPPES registry as of the last update on 2025-09-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.