Billy Loo, MD, PHD
NPI 1720167711 · Radiation Oncology Physician · Stanford, CA
Enrolled with Medicare as Practitioner - Radiation Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Billy Loo, MD, PHD is a Radiation Oncology Physician provider in Stanford, CA (NPI 1720167711).
Provider details
- NPI number
- 1720167711
- Entity type
- Individual
- Primary specialty
- Radiation Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, PHD
- Sex
- Male
- Sole proprietor
- No
- License
- A76374 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
332 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 69 | $109 |
| Ct Guidance for Insertion of Radiation Therapy Fields77014 | 38 | $52 |
| Calculation of Radiation Therapy Dose77300 | 36 | $38 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 36 | $75 |
| Design and Construction of Radiation Treatment Device for High Precision Radiation Therapy77338 | 29 | $262 |
| Complex Radiation Therapy Planning77263 | 28 | $193 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$6,703 across 9 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-02
- Last updated
- 2013-07-05
Frequently asked questions
- What is Billy Loo's NPI number?
- Billy Loo's National Provider Identifier (NPI) is 1720167711, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Billy Loo's specialty?
- Billy Loo is listed in the NPPES registry with a primary specialty of Radiation Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Billy Loo located?
- Billy Loo's practice location on file with NPPES is 875 Blake Wilbur Dr, Stanford, CA 94305-5847.
- What is Billy Loo's phone number?
- The practice phone number listed in the NPPES registry for Billy Loo is (650) 736-7143.
- Does Billy Loo accept Medicare?
- Billy Loo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Billy Loo's NPI active?
- Yes — Billy Loo's NPI (1720167711) is active in the NPPES registry as of the last update on 2013-07-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.