Margaret Sidun
NPI 1962209270 · Addiction (Substance Use Disorder) Counselor · San Mateo, CA
Margaret Sidun is a Addiction (Substance Use Disorder) Counselor provider in San Mateo, CA (NPI 1962209270).
Provider details
- NPI number
- 1962209270
- Entity type
- Individual
- Primary specialty
- Addiction (Substance Use Disorder) CounselorBehavioral Health & Social Service Providers
- Sex
- Female
- Sole proprietor
- Yes
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
1 yr 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
- 2025-02-26
- Last updated
- 2025-02-26
- Certified
- 2025-02-25
Frequently asked questions
- What is Margaret Sidun's NPI number?
- Margaret Sidun's National Provider Identifier (NPI) is 1962209270, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Margaret Sidun's specialty?
- Margaret Sidun is listed in the NPPES registry with a primary specialty of Addiction (Substance Use Disorder) Counselor (Behavioral Health & Social Service Providers).
- Where is Margaret Sidun located?
- Margaret Sidun's practice location on file with NPPES is 2251 Palm Ave, San Mateo, CA 94403-1814.
- What is Margaret Sidun's phone number?
- The practice phone number listed in the NPPES registry for Margaret Sidun is (650) 513-6500.
- Is Margaret Sidun's NPI active?
- Yes — Margaret Sidun's NPI (1962209270) is active in the NPPES registry as of the last update on 2025-02-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.