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Walter Zajac, MD
NPI 1679651343 · Gastroenterology Physician · Roseville, CA
Walter Zajac, MD is a Gastroenterology Physician provider in Roseville, CA (NPI 1679651343).
Provider details
- NPI number
- 1679651343
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G63354 (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
1600 Eureka Rd
Roseville, CA 95661-3027
Phone: (916) 784-4000
Street-level locationGet directions
Mailing address
1800 Harrison St Fl 7
Oakland, CA 94612-3429
Registry dates
- Enumerated
- 2006-11-01
- Last updated
- 2009-02-27
Frequently asked questions
- What is Walter Zajac's NPI number?
- Walter Zajac's National Provider Identifier (NPI) is 1679651343, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Walter Zajac's specialty?
- Walter Zajac is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Walter Zajac located?
- Walter Zajac's practice location on file with NPPES is 1600 Eureka Rd, Roseville, CA 95661-3027.
- What is Walter Zajac's phone number?
- The practice phone number listed in the NPPES registry for Walter Zajac is (916) 784-4000.
- Is Walter Zajac's NPI active?
- Yes — Walter Zajac's NPI (1679651343) is active in the NPPES registry as of the last update on 2009-02-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.