Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
David S. Gullion, M.D.
Specialist in Greenbrae, CA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1639270986
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Registry record
Entity type Individual (Type 1)
Name David S. Gullion
Credential M.D.
Sex Male
Practice address 1350 S Eliseo Dr, Suite 200, Greenbrae, CA, 94904
Phone (415) 925-5000
Fax (415) 925-5050
Enumeration date Sep 26, 2006
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| G16825 | Other | CA | STATE LICENSE |
| 00G168250 | Medicaid | CA | - |
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.
Frequently asked questions
What specialty is David Gullion?
David Gullion is registered in NPPES with the primary taxonomy of Specialist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
Other providers at this practice address
Browse all → John Bettinger Gastroenterology Physician · Greenbrae, CA NPI 1225037500 Joseph Poen Radiation Oncology Physician · Greenbrae, CA NPI 1972585941 Lloyd Miyawaki Radiation Oncology Physician · Greenbrae, CA NPI 1497737464 Ernest Torigoe Radiation Oncology Physician · Greenbrae, CA NPI 1720060700 Francine Halberg Radiation Oncology Physician · Greenbrae, CA NPI 1275515256 Marin Radiation Oncology Medical Group Radiation Oncology Physician · Greenbrae, CA NPI 1184606162 Alex Metzger Hematology & Oncology Physician · Greenbrae, CA NPI 1821070590 California Cancer Care, Inc. Specialist · Greenbrae, CA NPI 1417930744
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.