Michael Sonn
NPI 1578091435 · Clinical Social Worker · Willow Creek, CA
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Sonn is a Clinical Social Worker provider in Willow Creek, CA (NPI 1578091435).
Provider details
- NPI number
- 1578091435
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Behavioral Health & Social Service Providers
- Counselor101Y00000X
Behavioral Health & Social Service Providers
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
9 yrs in NPPES registry
- Profile completeness38% of score
83% 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
- 2017-05-23
- Last updated
- 2021-05-19
- Certified
- 2021-05-19
Frequently asked questions
- What is Michael Sonn's NPI number?
- Michael Sonn's National Provider Identifier (NPI) is 1578091435, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Sonn's specialty?
- Michael Sonn is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Michael Sonn located?
- Michael Sonn's practice location on file with NPPES is 114 Orchard Ln, Willow Creek, CA 95573-9310.
- What is Michael Sonn's phone number?
- The practice phone number listed in the NPPES registry for Michael Sonn is (707) 633-8054.
- Does Michael Sonn accept Medicare?
- Michael Sonn is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Sonn's NPI active?
- Yes — Michael Sonn's NPI (1578091435) is active in the NPPES registry as of the last update on 2021-05-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.