DR. BILLY W LOO (MD, PHD) – Radiation Oncology Physician, NPI 1720167711
Radiation Oncology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
677 RADIATION ONCOLOGY in CA
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Provider Addresses for DR. BILLY W LOO (MD, PHD)
Cafe Salute, 875, Blake Wilbur Drive, Stanford, Palo Alto, Santa Clara County, California, 94305-6015, United States
STANFORD RADIATION ONCOLOGY
STANFORD, CA 943055847
Phone: (650) 736-7143
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 17 Open Payments records for all available years, with a total value of $9,404.
Total Amount is formed as General ($9,404) + Research ($0) + Ownership ($0) = $9,404.
Last reported payment date: 2024-11-07 • Largest payer in this snapshot: Mevion_Medical_Systems_Inc ($7,439).
Total Amount
$9,404
General + Research + Ownership
Payments
17
Total payment records
General Amount
$9,404
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-11-07
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Mevion_Medical_Systems_Inc | $7,439 |
| RefleXion Medical, Inc. | $1,763 |
| Genentech USA, Inc. | $116 |
| Siemens Medical Solutions USA, Inc. | $63 |
| Elekta, Inc. | $24 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2005-07-15
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20050715001042 | I | Radiation Oncology | CA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 46 | 44 | $0 |
| 77014 | Ct guidance for insertion of radiation therapy fields | 27 | 20 | $0 |
| G6002 | Stereoscopic x-ray guidance for localization of target volume for the delivery of radiation therapy | 27 | 11 | $0 |
| 77334 | Design and construction of complex radiation treatment device | 18 | 12 | $0 |
Insurance plans in this area (ZIP 94305)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| RADIATION ONCOLOGY | CA | 77263 | Management of radiation therapy, complex | 44 | 40 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| O B S T E T R I C S/ G Y N E C O L O G Y | TX | |
| - | CA | |
| - | CA | |
| - | CA | |
| O B S T E T R I C S/ G Y N E C O L O G Y | CA | |
| Hematology, Medical Oncology | NY | |
| Certified Registered Nurse Anesthetist (Crna) | TX | |
| Nurse Practitioner | CA | |
| Nurse Practitioner | CA | |
| Neuropsychiatry, Neurology | CA |
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