John Byun, MD
NPI 1528487089 · Radiation Oncology Physician · Stanford, CA
Enrolled with Medicare as Practitioner - Radiation Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Byun, MD is a Radiation Oncology Physician provider in Stanford, CA (NPI 1528487089).
Provider details
- NPI number
- 1528487089
- Entity type
- Individual
- Primary specialty
- Radiation Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 25MA10129400 (NJ)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
12 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
4 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
776 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Calculation of Radiation Therapy Dose77300 | 312 | $38 |
| Ct Guidance for Insertion of Radiation Therapy Fields77014 | 179 | $52 |
| Design and Construction of Complex Radiation Treatment Device77334 | 79 | $70 |
| Stereoscopic X-Ray Guidance for Localization of Target Volume for the Delivery of Radiation TherapyG6002 | 54 | $24 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 27 | $19 |
| Obtaining Data Needed to Develop the Optimal Radiation Treatment, 3 Or More Treatment Areas Or Any Number of Treatment Areas Where Special Treatment Is Involved |
Practice location
Mailing address
Additional practice locations (3)
- 300 Sierra College Dr Ste 150Grass Valley, CA 95945-5083Phone: (530) 802-6400
- 3249 Oak Park AveBerwyn, IL 60402-3429Phone: (708) 783-3403
- 195 Little Albany StNew Brunswick, NJ 08901-1914Phone: (732) 253-3939
Registry dates
- Enumerated
- 2014-04-14
- Last updated
- 2025-09-26
- Certified
- 2025-09-26
Frequently asked questions
- What is John Byun's NPI number?
- John Byun's National Provider Identifier (NPI) is 1528487089, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Byun's specialty?
- John Byun is listed in the NPPES registry with a primary specialty of Radiation Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is John Byun located?
- John Byun's practice location on file with NPPES is 300 Pasteur Dr, Stanford, CA 94305-2200.
- What is John Byun's phone number?
- The practice phone number listed in the NPPES registry for John Byun is (650) 723-4000.
- Does John Byun accept Medicare?
- John Byun is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Byun's NPI active?
- Yes — John Byun's NPI (1528487089) is active in the NPPES registry as of the last update on 2025-09-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.