Dennis Zai, M.D., Inc
Dennis Zai, M.D., Inc is a healthcare organization registered as Gastroenterology Physician in Antioch, CA, holding Type 2 (organization) NPI 1578659561 since 2006. The authorized official on file is Dennis Zai, President.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1578659561 |
|---|---|
| Entity type | Organization (Type 2) |
| Legal business name | Dennis Zai, M.D., Inc |
| Practice address | 3903 LONE TREE WAY, SUITE 205, Antioch, CA, 94509 |
| Phone | 9257848710 |
| Enumeration date | 2006-10-05 |
| Last updated in NPPES | 2015-02-13 |
Authorized official
| Name | Dennis Zai |
|---|---|
| Title | President |
| Phone | 9257548710 |
Taxonomy & classification
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 207RG0100X | Gastroenterology Physician | Primary | G38299 | CA |
Copy-ready billing details
Provider: Dennis Zai, M.D., Inc NPI: 1578659561 Taxonomy: 207RG0100X (Gastroenterology Physician) Address: 3903 LONE TREE WAY, SUITE 205, Antioch, CA, 94509
Providers at this address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1740253350 | Dennis Zai | Individual | Gastroenterology Physician | Antioch, CA |
| 1750334660 | Delta Pediatrics Medical Group, Inc. | Organization | Preferred Provider Organization | Antioch, CA |
| 1306874714 | Hamidreza Khonsari | Individual | Family Medicine Physician | Antioch, CA |
| 1215960091 | Full Care Medical Group, Inc. | Organization | Family Medicine Physician | Antioch, CA |
| 1255350534 | Sumner Seibert | Individual | Orthopaedic Surgery Physician | Antioch, CA |
| 1265440101 | Michael Ditmars | Individual | Surgery Physician | Antioch, CA |
| 1952403909 | Naoko Ikeda | Individual | Family Medicine Physician | Antioch, CA |
| 1750477733 | Alex A. Aslan, MD, Inc | Organization | Gastroenterology Physician | Antioch, CA |
Verify this record
Cross-check NPI 1578659561 against the authoritative CMS record: view Dennis Zai, M.D., Inc on the official NPPES registry .
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty. Read the full guide or validate an NPI number.
Frequently asked questions
Who is the authorized official for Dennis Zai, M.D., Inc?
What is the NPI number for Dennis Zai, M.D., Inc?
Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2015-02-13.