Michael Zhang, M.D., PH.D.
NPI 1861856718 · Radiation Oncology Physician · Vallejo, CA
Enrolled with Medicare as Practitioner - Radiation Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Zhang, M.D., PH.D. is a Radiation Oncology Physician provider in Vallejo, CA (NPI 1861856718).
Provider details
- NPI number
- 1861856718
- Entity type
- Individual
- Primary specialty
- Radiation Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D., PH.D.
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
10 yrs in NPPES registry
- Profile completeness25% of score
83% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
2,038 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) |
|---|---|---|
| Ct Guidance for Insertion of Radiation Therapy Fields77014 | 846 | $49 |
| Radiation Treatment Management, 5 Treatment Sessions77427 | 236 | $209 |
| Calculation of Radiation Therapy Dose77300 | 195 | $36 |
| Design and Construction of Complex Radiation Treatment Device77334 | 157 | $66 |
| Prolonged Office Or Other Outpatient Evaluation and Management Service(s) Beyond the Maximum Required Time of the Primary Procedure Which Has Been Selected Using Total Time on the Date of the Primary Service; Each Additional 15 Minutes By the Physician OrG2212 | 80 | $33 |
| Complex Radiation Therapy Planning77263 | 72 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 4 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Tamsulosin Hcl | 42 | 17 |
| Oxybutynin Chloridebrand: Oxybutynin Chloride Er | 29 | — |
| Famotidine | 19 | — |
| Gabapentin | 14 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$467 across 8 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
Additional practice locations (1)
- 2333 Buchanan StLevel BSan Francisco, CA 94115-1925Phone: (415) 600-3600
Registry dates
- Enumerated
- 2016-04-07
- Last updated
- 2022-10-26
- Certified
- 2022-10-26
Frequently asked questions
- What is Michael Zhang's NPI number?
- Michael Zhang's National Provider Identifier (NPI) is 1861856718, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Zhang's specialty?
- Michael Zhang is listed in the NPPES registry with a primary specialty of Radiation Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Zhang located?
- Michael Zhang's practice location on file with NPPES is 100 Hospital Dr Ste 100, Vallejo, CA 94589-2577.
- What is Michael Zhang's phone number?
- The practice phone number listed in the NPPES registry for Michael Zhang is (707) 551-3400.
- Does Michael Zhang accept Medicare?
- Michael Zhang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Zhang's NPI active?
- Yes — Michael Zhang's NPI (1861856718) is active in the NPPES registry as of the last update on 2022-10-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.