Mary Feng, M.D.
NPI 1720106693 · Radiation Oncology Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Radiation Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Feng, M.D. is a Radiation Oncology Physician provider in San Francisco, CA (NPI 1720106693).
Provider details
- NPI number
- 1720106693
- Entity type
- Individual
- Primary specialty
- Radiation Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 4301079982 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
428 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) |
|---|---|---|
| Calculation of Radiation Therapy Dose77300 | 126 | $37 |
| Ct Guidance for Insertion of Radiation Therapy Fields77014 | 106 | $51 |
| Design and Construction of Radiation Treatment Device for High Precision Radiation Therapy77338 | 43 | $258 |
| High Precision Radiation Therapy Planning77301 | 42 | $480 |
| Complex Radiation Therapy Planning77263 | 37 | $187 |
| Obtaining Respiratory Data Needed to Develop the Optimal Radiation Treatment77293 | 27 | $120 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$274 across 2 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)
- 1500 East Medical Center DrB2 Floor University Hospital Rm C490Ann Arbor, MI 48109-5010Phone: (734) 936-4300
Registry dates
- Enumerated
- 2007-03-27
- Last updated
- 2022-09-27
- Certified
- 2022-09-27
Frequently asked questions
- What is Mary Feng's NPI number?
- Mary Feng's National Provider Identifier (NPI) is 1720106693, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Feng's specialty?
- Mary Feng is listed in the NPPES registry with a primary specialty of Radiation Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Mary Feng located?
- Mary Feng's practice location on file with NPPES is 1825 4th Street, L1101, San Francisco, CA 94143.
- What is Mary Feng's phone number?
- The practice phone number listed in the NPPES registry for Mary Feng is (415) 502-7222.
- Does Mary Feng accept Medicare?
- Mary Feng is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Feng's NPI active?
- Yes — Mary Feng's NPI (1720106693) is active in the NPPES registry as of the last update on 2022-09-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.