NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1497020580 MD
Verify on CMS → Maria Fan, MD
Internal Medicine Physician in Seattle, Washington.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 172,858 in Internal Medicine 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
2K
Medicare Part D claims · 220 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
88%
generic claims · 10% brand-name · higher generic rates reduce patient out-of-pocket costs
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
Maria Fan, MD filed 1,947 Medicare Part D claims in 2023 as a Internal Medicine Physician in Seattle, Washington, prescribing 88% generic.
- 2K
- Part D claims, 2023
- 88%
- 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.
Maria Fan, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,947 Top 16% higher than 84% 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)
Maria Fan, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 2 hospital affiliations - 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 Maria Fan, MD?
Quality data not reportedPrimary specialty
Internal Medicine Physician
Medicare Part D claims
1,947 28% vs specialty avg
Specialty distribution in Washington
How Internal Medicine Physician compares to other specialties among Washington 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 Internal Medicine 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).
Maria Fan, MD appears in the CMS NPPES registry as a Internal Medicine Physician provider holding MD credentials at 515 MINOR AVE STE 300, Seattle, WA, 98104, with a listed phone of (206) 386-9500. NPI 1497020580 was issued on 03/21/2012.
Medicare Part D records for calendar year 2023 show 1,947 prescription claims written by this provider, covering 220 Medicare beneficiaries and totaling roughly $198K in drug spend, split 10% brand-name and 88% generic by claim count, with an opioid prescribing rate of 0.6%.
Internal Medicine Physician is a high-volume specialty nationwide, with 172,858 enrolled providers across 56 states and an average of 2,716 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 | 1497020580 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 03/21/2012 |
Hospital and facility affiliations
Facilities where Maria Fan, MD 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.
Kaiser Foundation Health Plan OF Washington
Bellevue, WA
Swedish Health Services
Seattle, WA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
License & disciplinary context - Washington WMC 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 ~34K Washington medical licensees in 2023 - they are NOT specific to Maria Fan, MD. To verify Maria Fan, MD's current license status, search the WMC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
88
Total board actions, Washington 2023
Across 85 cases
2.59
Actions per 1,000 licensees
Washington statewide rate
probation
Most common action type
31 cases
WMC 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 Washington disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
Maria Fan, MD - brand share 10.0%
Internal Medicine Physician average
10% brand-name claims vs 88% generic, on 1,947 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.
1,947
Total Claims
$198K
Total Drug Cost
220
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 4,042
- Total Day Supply
- 117,360
- Brand vs Generic
- 10% brand / 88% generic
- Brand Drug Cost
- $161K
- Generic Drug Cost
- $37K
- Opioid Claims
- 11 (0.6% rate)
- Antibiotic Claims
- 36
Patient Demographics
- Average Patient Age
- 74.7 years
- Avg HCC Risk Score
- 1.38
- Gender Split
- 73% female / 27% male
- Age Distribution
- <65: 11, 65-74: 103, 75-84: 77, 85+: 29
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Maria Fan, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
187 claims
- Amlodipine Besylate
Amlodipine Besylate
90 claims
- Losartan Potassium
Losartan Potassium
83 claims
- Levothyroxine Sodium
Levothyroxine Sodium
81 claims
- Rosuvastatin Calcium
Rosuvastatin Calcium
80 claims
- Lisinopril 62
Lisinopril
62 claims
- Gabapentin 56
Gabapentin
56 claims
- Duloxetine Hcl 43
Duloxetine Hcl
43 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 187 |
| Amlodipine Besylate | 90 |
| Losartan Potassium | 83 |
| Levothyroxine Sodium | 81 |
| Rosuvastatin Calcium | 80 |
| Lisinopril | 62 |
| Gabapentin | 56 |
| Duloxetine Hcl | 43 |
| Metoprolol Succinate | 41 |
| Metformin Hcl Er Metformin Hcl | 40 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Internal Medicine Physician Overview
How Maria Fan, MD fits within the Internal Medicine Physician landscape nationally.
172,858
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,716
Avg Claims per Provider
Maria Fan, MD's 1,947 claims are below the specialty average of 2,716.
Nearby Internal Medicine Physician Providers in Washington
Other clinicians with the same primary specialty enrolled in Washington, drawn from the same CMS NPPES roster as Fan.
Dr. Sheida Aalami
M.D.
Seattle, WA
Dr. Barry Aaronson
MD
Seattle, WA
Gloria Abacan
Prosser, WA
Rebecca Abay
Seattle, WA
Syed Abbas
Tacoma, WA
Compare Internal Medicine 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 Washington medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Internal Medicine 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.
Healthcare Guides
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Medical Specialties Explained
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Understanding Medicare Claims Data
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Frequently Asked Questions
What is Maria Fan, MD's specialty? ▼
Maria Fan, MD specializes in Internal Medicine Physician and practices in Seattle, Washington. Credentials: MD.
How much does Maria Fan, MD prescribe under Medicare Part D? ▼
In 2023, Maria Fan, MD wrote 1,947 Medicare Part D claims totaling $198K in drug costs for 220 beneficiaries.
Where is Maria Fan, MD located? ▼
Maria Fan, MD is located at 515 MINOR AVE STE 300, Seattle, WA, 98104. Phone: (206) 386-9500.
What is Maria Fan, MD's NPI number? ▼
Maria Fan, MD's National Provider Identifier (NPI) is 1497020580, issued on 03/21/2012.
Does Maria Fan, MD prescribe more brand-name or generic drugs? ▼
Maria Fan, MD's prescribing is 10% brand-name and 88% generic drugs by claim count, with $161K in brand drug costs.
Does Maria Fan, MD prescribe opioids? ▼
Yes, Maria Fan, MD had 11 opioid claims in 2023 with an opioid prescribing rate of 0.6%.
How many Internal Medicine Physician providers are there in the US? ▼
There are 172,858 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,716 Medicare Part D claims per year.
What drugs does Maria Fan, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Maria Fan, MD's most frequently prescribed drugs include Atorvastatin Calcium, Amlodipine Besylate, Losartan Potassium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Maria Fan, MD accept Medicare? ▼
Maria Fan, MD appears in CMS Medicare data with 1,947 Part D claims and 220 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Maria Fan, MD's credentials? ▼
Maria Fan, MD's NPI is 1497020580 with credentials MD. 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.