Mary Duzak
NPI 1851916423 · Addiction (Substance Use Disorder) Counselor · San Jose, CA
Mary Duzak is a Addiction (Substance Use Disorder) Counselor provider in San Jose, CA (NPI 1851916423).
Provider details
- NPI number
- 1851916423
- Entity type
- Individual
- Primary specialty
- Addiction (Substance Use Disorder) CounselorBehavioral Health & Social Service Providers
- Sex
- Female
- Sole proprietor
- No
- License
- R1399920820 (CA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Behavioral Health & Social Service Providers
Pharmacy Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
6 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
- 2020-06-10
- Last updated
- 2020-09-13
- Certified
- 2020-09-13
Frequently asked questions
- What is Mary Duzak's NPI number?
- Mary Duzak's National Provider Identifier (NPI) is 1851916423, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Duzak's specialty?
- Mary Duzak is listed in the NPPES registry with a primary specialty of Addiction (Substance Use Disorder) Counselor (Behavioral Health & Social Service Providers).
- Where is Mary Duzak located?
- Mary Duzak's practice location on file with NPPES is 298a Bernal Road, San Jose, CA 95119.
- What is Mary Duzak's phone number?
- The practice phone number listed in the NPPES registry for Mary Duzak is (408) 780-0755.
- Is Mary Duzak's NPI active?
- Yes — Mary Duzak's NPI (1851916423) is active in the NPPES registry as of the last update on 2020-09-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.