IndividualActive
William Hallstein
NPI 1093862047 · Psychiatry Physician · Martinez, CA
William Hallstein is a Psychiatry Physician provider in Martinez, CA (NPI 1093862047).
Provider details
- NPI number
- 1093862047
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- Yes
- License
- G24247 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(90/100 index)
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
2500 Alhambra Ave
Martinez, CA 94553-3156
Phone: (925) 370-5110
Fax: (925) 370-5142
Street-level locationGet directions
Mailing address
50 Douglas Dr
Martinez, CA 94553-4098
Registry dates
- Enumerated
- 2007-01-04
- Last updated
- 2007-07-08
Frequently asked questions
- What is William Hallstein's NPI number?
- William Hallstein's National Provider Identifier (NPI) is 1093862047, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Hallstein's specialty?
- William Hallstein is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is William Hallstein located?
- William Hallstein's practice location on file with NPPES is 2500 Alhambra Ave, Martinez, CA 94553-3156.
- What is William Hallstein's phone number?
- The practice phone number listed in the NPPES registry for William Hallstein is (925) 370-5110.
- Is William Hallstein's NPI active?
- Yes — William Hallstein's NPI (1093862047) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.