Douglas Obrien
Douglas Obrien is a Physician Assistant provider (Physician Assistant) practicing in Greenbrae, CA, registered in the NPPES registry with NPI 1235158239 since 2006.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1235158239 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Douglas Obrien |
| Sex | Male |
| Practice address | 250 BON AIR RD, Greenbrae, CA, 94904 |
| Phone | 4159257000 |
| Enumeration date | 2006-07-19 |
| Last updated in NPPES | 2021-03-03 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 363A00000X | Physician Assistant | Primary | PA13578 | CA |
Copy-ready billing details
Provider: Douglas Obrien NPI: 1235158239 Taxonomy: 363A00000X (Physician Assistant) Address: 250 BON AIR RD, Greenbrae, CA, 94904
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1124021738 | Marin Community Clinic | Organization | Federally Qualified Health Center (FQHC) | Greenbrae, CA |
| 1225031727 | Aida Calvillo | Individual | Internal Medicine Physician | Greenbrae, CA |
| 1912900499 | Debra Walhof | Individual | Pediatrics Physician | Greenbrae, CA |
| 1346249067 | Georgianna Farren | Individual | Internal Medicine Physician | Greenbrae, CA |
| 1780677963 | Janet Miller-Melka | Individual | Nurse Practitioner | Greenbrae, CA |
| 1538146337 | Dana Huskey | Individual | Obstetrics & Gynecology Physician | Greenbrae, CA |
| 1679550032 | Russell Fritz | Individual | Diagnostic Radiology Physician | Greenbrae, CA |
| 1396725677 | Marin General Hospital | Organization | General Acute Care Hospital | Greenbrae, CA |
Verify this record
Cross-check NPI 1235158239 against the authoritative CMS record: view Douglas Obrien 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
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2021-03-03.