Dr. Billy W Loo, MD, PHD
Dr. Billy W Loo is a Radiation Oncology Physician provider (Radiology) practicing in Stanford, CA, registered in the NPPES registry with NPI 1720167711 since 2006. The credential MD stands for Doctor of Medicine.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1720167711 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Dr. Billy W Loo |
| Credential | MD, PHD |
| Sex | Male |
| Practice address | 875 BLAKE WILBUR DR, STANFORD RADIATION ONCOLOGY, Stanford, CA, 94305 |
| Phone | 6507367143 |
| Enumeration date | 2006-11-02 |
| Last updated in NPPES | 2013-07-05 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 2085R0001X | Radiation Oncology Physician | Primary | A76374 | CA |
MD — Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential
Copy-ready billing details
Provider: Billy Loo, MD, PHD NPI: 1720167711 Taxonomy: 2085R0001X (Radiation Oncology Physician) Address: 875 BLAKE WILBUR DR, STANFORD RADIATION ONCOLOGY, Stanford, CA, 94305
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1891702312 | Howard Lee | Individual | Medical Oncology Physician | Stanford, CA |
| 1003916636 | Laura Asaro | Individual | Nurse Practitioner | Stanford, CA |
| 1790856474 | Amreen Husain | Individual | Obstetrics & Gynecology Physician | Stanford, CA |
| 1144385386 | Kathleen Horst | Individual | Radiation Oncology Physician | Stanford, CA |
| 1851437131 | Michael Kaplan | Individual | Otolaryngology Physician | Stanford, CA |
| 1568500551 | Scott Soltys | Individual | Radiation Oncology Physician | Stanford, CA |
| 1063550747 | Daniel Kapp | Individual | Radiation Oncology Physician | Stanford, CA |
| 1992843916 | Phyllis Yang | Individual | Diagnostic Radiology Physician | Stanford, CA |
Verify this record
Cross-check NPI 1720167711 against the authoritative CMS record: view Dr. Billy W Loo 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 2013-07-05.