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DR. MARY UAN-SIAN FENG M.D.
NPI 1720106693
Radiology - Radiation Oncology in San Francisco, CA

Active since March 27, 2007PECOS EnrolledAccepts Medicare Assignment
74.46/100
CMS Quality Rating
1825 4TH STREET, L1101, SAN FRANCISCO, CA 94143(415) 502-7222 Get Directions Write a Review

NPPES record last updated: September 27, 2022. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Sep 27, 2022, Jun 10, 2020 (2 updates tracked since 2020).

About Dr. Mary Uan-sian Feng M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MARY UAN-SIAN FENG M.D. (NPI 1720106693) is an individual radiation oncology provider in San Francisco, California, licensed in California (C143118) and active in the NPI registry since March 2007. She is enrolled in Medicare PECOS and is a graduate of Washington University School Of Medicine (2002).

NPPES Registry Identity

NPI1720106693
Entity TypeIndividualFemale
Primary Taxonomy2085R0001X
Provider Legal NameDR. MARY UAN-SIAN FENGCredential: M.D.
Location Address1825 4TH STREET, L1101San Francisco, CA 94143
Mailing Address1825 4th Street. M2260, Box 4001San Francisco, CA 94143 · (415) 502-7222
Phone(415) 502-7222
Sole ProprietorNo
Medical School CMSWashington University School Of MedicineGraduated 2002
Enumeration DateMarch 27, 2007
Last NPPES UpdateSeptember 27, 20222 updates tracked since enumeration
NPPES CertifiedSeptember 27, 2022
✔ NPI 1720106693 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyRadiology · Radiation OncologyAllopathic & Osteopathic Physicians
Taxonomy Code2085R0001X
Licenses✔ Licensed in CA · C143118✔ Licensed in MI · 4301079982
Definition
A radiologist who deals with the therapeutic applications of radiant energy and its modifiers and the study and management of disease, especially malignant tumors.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X · License 4301079982 (MI)
1825 4TH STREET, L1101, San Francisco, CA 94143
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Mary Uan-sian Feng M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID2567554355
PECOS Enrollment IDI20160819001417
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 8

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Calculation of radiation therapy dose 77300
Radiation therapy dose calculation is a process to determine the exact amount of radiation needed to treat a specific area in the body. This calculation helps ensure the treatment is effective while minimizing harm to healthy tissues. It's a key part of planning your radiation therapy.
126 services43 patients
Ct guidance for insertion of radiation therapy fields 77014
CT guidance for insertion of radiation therapy fields involves using a CT scan to accurately map the area of your body where radiation will be applied. This ensures the radiation targets only the necessary area, minimizing impact to healthy tissues.
106 services15 patients
Design and construction of radiation treatment device for high precision radiation therapy 77338
A radiation treatment device is custom-made for each patient to target cancer cells with high precision. It's designed to focus radiation on the tumor, sparing healthy tissue. This process ensures effective therapy while minimizing side effects.
43 services42 patients
High precision radiation therapy planning 77301
High precision radiation therapy planning involves detailed mapping of your body to target cancer cells accurately. Advanced imaging techniques help identify the exact location of the tumor, minimizing harm to healthy tissues. This personalized approach enhances effectiveness and reduces side effects.
42 services42 patients
Complex radiation therapy planning 77263
Complex radiation therapy planning is a process to determine the most effective way to deliver radiation to a specific area in your body. It involves detailed imaging to map your body's structure, allowing for precise targeting of cancer cells while sparing healthy tissue.
37 services37 patients
Obtaining respiratory data needed to develop the optimal radiation treatment 77293
Obtaining respiratory data is vital for optimal radiation treatment. This involves tracking your breathing patterns to ensure the precise delivery of radiation to the target area, minimizing damage to healthy tissue. It's a non-invasive process and contributes to effective treatment.
27 services27 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94143 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$202.35 typical visit price
range $69.00 – $202.35
Typical copayment $50.58 (range $17.25 – $50.58)
Most-billed visit code 99205
Established Patient
$84.91 typical visit price
range $23.44 – $166.46
Typical copayment $21.22 (range $5.86 – $41.61)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

74.46/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Promoting Interoperability76
Improvement Activities40
Cost46.68

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mary Feng's NPI number?

The NPI number for Mary Feng is 1720106693. It was assigned to this individual provider in the NPPES registry on March 27, 2007.

Where is Mary Feng located?

Mary Feng practices at 1825 4th Street, L1101, San Francisco, CA 94143. The listed phone number is (415) 502-7222.

What is Mary Feng's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Radiation Oncology, with taxonomy code 2085R0001X.

Is Mary Feng enrolled in Medicare?

Yes. Mary Feng is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

When was this NPI record last updated?

The NPPES record for Mary Feng was last updated on September 27, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.