Dr. Dennis Zai, MD
- Part D claims, 2016
- 29
- Affiliated sites
- 3
- Medical groups
- 2
- State license
- 1
- Year NPI issued
- 2006
- Practice address
- 3903 Lone Tree Way Ste 205 Suite 205, Antioch, CA 94509-6269
- Practice phone
- Call (925) 754-8710
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Varujan Arek Keledjian
Medical specialty practice · Antioch, California
Find Dr. Zai's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Dennis Zai is a gastroenterologist in Antioch, California
Dr. Zai practices at Varujan Arek Keledjian in Antioch, California.
Dr. Zai's NPI, 1740253350, was assigned on February 13, 2006. Dr. Zai graduated from University of Illinois College of Medicine - Chicago in 1973. Dr. Zai's California license number on file is G38299.
- NPI
- 1740253350NPI Registry (opens in a new tab)
- NPI enumeration date
- February 13, 2006
- NPI status
- Active
- Practice phone
- (925) 754-8710
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Medical school graduation
- 1973
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Dennis Zai practices at Varujan Arek Keledjian in Antioch, California
Dr. Zai's primary practice is Varujan Arek Keledjian, at 3903 Lone Tree Way Ste 205 Suite 205, Antioch, CA 94509-6269. The practice phone is (925) 754-8710.
- Varujan Arek Keledjian3903 Lone Tree Way Ste 205 Suite 205, Antioch, CA 94509-6269Phone(925) 754-8710
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Dennis Zai is affiliated with 3 sites of care and 2 medical groups
Dr. Zai's primary practice is Varujan Arek Keledjian in Antioch, California. Dmand AI also links Dr. Zai to 2 medical groups, 1 physician office and 1 group practice or clinic, each named with a free account.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. Dennis Zai's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Zai practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Varujan Arek Keledjian | Available with a free account |
| +2 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Dennis Zai is one of 1,977 gastroenterologists in California
Gastroenterology is Dr. Zai's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Zai is board certified in gastroenterology by the American Board of Internal Medicine. Dr. Zai has a license on file in California.
Specialties and state licenses
- Gastroenterology, CaliforniaPrimary
Gastroenterologists near Dr. Zai
Counts of gastroenterologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Dennis Zai wrote 29 Medicare Part D claims in 2016
In 2016, Dr. Zai wrote 29 Medicare Part D claims. Every claim was for a generic drug. They cover 2 drugs, with $253 in total drug cost.
Dr. Zai's most prescribed drugs by claims, 2016
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Dennis Zai graduated from University of Illinois College of Medicine - Chicago
Dr. Zai graduated from University of Illinois College of Medicine - Chicago in 1973.
- Medical school
- Board certified in gastroenterology
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Sources for Dr. Dennis Zai's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Dennis Zai
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Dennis Zai's NPI number?
Dr. Dennis Zai's NPI number is 1740253350. It was assigned on February 13, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Dennis Zai?
Dr. Dennis Zai is a gastroenterologist in Antioch, California. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Dennis Zai practice?
Dr. Zai practices at 3903 Lone Tree Way Ste 205 Suite 205, Antioch, CA 94509-6269. Dr. Zai's primary practice is Varujan Arek Keledjian in Antioch, California. Dmand AI also links Dr. Zai to 2 medical groups, 1 physician office and 1 group practice or clinic.
What is Dr. Dennis Zai's office phone number?
The practice phone on file for Dr. Zai is (925) 754-8710.
What is Dr. Dennis Zai's medical license number?
Dr. Zai's California license number on file is G38299.
Is Dr. Dennis Zai board certified?
Yes. Dr. Zai is board certified in gastroenterology by the American Board of Internal Medicine.
Where did Dr. Dennis Zai go to medical school?
Dr. Zai graduated from University of Illinois College of Medicine - Chicago in 1973.
What drugs does Dr. Dennis Zai prescribe most?
In 2016 Medicare Part D data, Dr. Zai's most prescribed drugs by claims were Pantoprazole Sodium and Famotidine.
How long has Dr. Dennis Zai been practicing?
Dr. Zai graduated from medical school in 1973, 53 years ago.
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