OrganizationActive
Dennis Zai, M.D., Inc
NPI 1578659561 · Gastroenterology Physician · Antioch, CA
Dennis Zai, M.D., Inc is a Gastroenterology Physician organization in Antioch, CA (NPI 1578659561).
Provider details
- NPI number
- 1578659561
- Entity type
- Organization
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Dennis Zai, President(925) 754-8710
- License
- G38299 (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
3903 Lone Tree Way
Suite 205
Antioch, CA 94509-6249
Phone: (925) 784-8710
Approximate (ZIP-level) locationGet directions
Mailing address
3903 Lone Tree Way
Antioch, CA 94509-6249
Registry dates
- Enumerated
- 2006-10-05
- Last updated
- 2015-02-13
Frequently asked questions
- What is Dennis Zai, M.D., Inc's NPI number?
- Dennis Zai, M.D., Inc's National Provider Identifier (NPI) is 1578659561, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Dennis Zai, M.D., Inc?
- Dennis Zai, M.D., Inc is classified in the NPPES registry as Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Dennis Zai, M.D., Inc located?
- Dennis Zai, M.D., Inc's practice location on file with NPPES is 3903 Lone Tree Way, Antioch, CA 94509-6249.
- What is Dennis Zai, M.D., Inc's phone number?
- The practice phone number listed in the NPPES registry for Dennis Zai, M.D., Inc is (925) 784-8710.
- Who is the authorized official for Dennis Zai, M.D., Inc?
- The authorized official listed on Dennis Zai, M.D., Inc's NPPES record is Dennis Zai, President. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Dennis Zai, M.D., Inc's NPI active?
- Yes — Dennis Zai, M.D., Inc's NPI (1578659561) is active in the NPPES registry as of the last update on 2015-02-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.