NPI registry status
Active
2026 NPPES data Gynecology Physician NPI 1801963988 M.D.
Verify on CMS → Fung-Yee Chan, M.D.
Gynecology Physician in San Francisco, California.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 3,906 in Gynecology Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
37
Medicare Part D claims · 12 beneficiaries · Gynecology Physician avg: 295
Generic prescribing
49%
generic claims · 51% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$847.42
23 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Fung-Yee Chan, M.D. filed 37 Medicare Part D claims in 2023 as a Gynecology Physician in San Francisco, California, prescribing 49% generic.
- 37
- Part D claims, 2023
- 49%
- generic prescribing
- Likely
- board-certified (heuristic)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Fung-Yee Chan, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
37 0th percentile higher than 0% of 1,370,886 prescribers
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
Fung-Yee Chan, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Fung-Yee Chan, M.D.?
Quality data not reportedPrimary specialty
Gynecology Physician
Medicare Part D claims
37 87% vs specialty avg
Specialty distribution in California
How Gynecology Physician compares to other specialties among California providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Gynecology Physician. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Fung-Yee Chan, M.D. appears in the CMS NPPES registry as a Gynecology Physician provider holding M.D. credentials at 3838 CALIFORNIA ST, San Francisco, CA, 94118, with a listed phone of (415) 379-9600. NPI 1801963988 was issued on 11/30/2006.
Medicare Part D records for calendar year 2023 show 37 prescription claims written by this provider, covering 12 Medicare beneficiaries and totaling roughly $4K in drug spend, split 51% brand-name and 49% generic by claim count.
Gynecology Physician is a narrow specialty nationwide, with 3,906 enrolled providers across 53 states and an average of 295 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1801963988 |
|---|---|
| Specialty | Gynecology Physician |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 11/30/2006 |
Hospital and facility affiliations
Facilities where Fung-Yee Chan, M.D. bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Pacific Womens Obstetrics And Gynecology Medical Group Inc
San Francisco, CA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Fung-Yee Chan, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$847
Largest payer
Astellas Pharma US Inc
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
License & disciplinary context - California MBC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~150K California medical licensees in 2023 - they are NOT specific to Fung-Yee Chan, M.D.. To verify Fung-Yee Chan, M.D.'s current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases
MBC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Brand-heavy
Fung-Yee Chan, M.D. - brand share 51.0%
Gynecology Physician average
51% brand-name claims vs 49% generic, on 37 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
37
Total Claims
$4K
Total Drug Cost
12
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 53
- Total Day Supply
- 1,352
- Brand vs Generic
- 51% brand / 49% generic
- Brand Drug Cost
- $4K
- Generic Drug Cost
- $843
Patient Demographics
- Average Patient Age
- 62.9 years
- Avg HCC Risk Score
- 0.66
- Gender Split
- 100% female / 0% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
| Drug | Claims |
|---|---|
| Prempro "Estrogen | N/A |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Gynecology Physician Overview
How Fung-Yee Chan, M.D. fits within the Gynecology Physician landscape nationally.
3,906
Gynecology Physician Providers in US
53
States with Gynecology Physician
295
Avg Claims per Provider
Fung-Yee Chan, M.D.'s 37 claims are below the specialty average of 295.
Nearby Gynecology Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Chan.
Dr. Ahmed Abdelaziz
MD
Santa Maria, CA
Dr. Keevan Abramson
MD
Fort Bragg, CA
Dr. Robert Adams
MD
Monterey, CA
Dr. Naphthali Alinsod
M.D.
Laguna Beach, CA
Dr. Parichehr Allameh
M.D.
Sylmar, CA
Compare Gynecology Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the California medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Gynecology Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Medical Specialties Explained
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Understanding Medicare Claims Data
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How insurance networks affect your costs
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Frequently Asked Questions
What is Fung-Yee Chan, M.D.'s specialty? ▼
Fung-Yee Chan, M.D. specializes in Gynecology Physician and practices in San Francisco, California. Credentials: M.D..
How much does Fung-Yee Chan, M.D. prescribe under Medicare Part D? ▼
In 2023, Fung-Yee Chan, M.D. wrote 37 Medicare Part D claims totaling $4K in drug costs for 12 beneficiaries.
Where is Fung-Yee Chan, M.D. located? ▼
Fung-Yee Chan, M.D. is located at 3838 CALIFORNIA ST, San Francisco, CA, 94118. Phone: (415) 379-9600.
What is Fung-Yee Chan, M.D.'s NPI number? ▼
Fung-Yee Chan, M.D.'s National Provider Identifier (NPI) is 1801963988, issued on 11/30/2006.
Does Fung-Yee Chan, M.D. prescribe more brand-name or generic drugs? ▼
Fung-Yee Chan, M.D.'s prescribing is 51% brand-name and 49% generic drugs by claim count, with $4K in brand drug costs.
How many Gynecology Physician providers are there in the US? ▼
There are 3,906 Gynecology Physician providers across 53 states in the US. The average Gynecology Physician provider writes 295 Medicare Part D claims per year.
What drugs does Fung-Yee Chan, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Fung-Yee Chan, M.D.'s most frequently prescribed drugs include Prempro. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Fung-Yee Chan, M.D. accept Medicare? ▼
Fung-Yee Chan, M.D. appears in CMS Medicare data with 37 Part D claims and 12 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Fung-Yee Chan, M.D.'s credentials? ▼
Fung-Yee Chan, M.D.'s NPI is 1801963988 with credentials M.D.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Compiled from official public sources by the PlainDoctor editorial team.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.