NPI registry status
Active
2026 NPPES data Pharmacist NPI 1164727855
Verify on CMS → William Chan
Pharmacist in Bellevue, 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 291,043 in Pharmacist, 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
527
Medicare Part D claims · 171 beneficiaries · Pharmacist avg: 135
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
William Chan filed 527 Medicare Part D claims in 2023 as a Pharmacist in Bellevue, Washington.
- 527
- Part D claims, 2023
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.
William Chan's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
527 Top 34% higher than 66% 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
What does the federal data show about William Chan?
Quality data not reportedPrimary specialty
Pharmacist
Medicare Part D claims
527 290% vs specialty avg
Specialty distribution in Washington
How Pharmacist 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 Pharmacist. 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).
William Chan appears in the CMS NPPES registry as a Pharmacist provider at 222 112TH AVE NE, Bellevue, WA, 98004, with a listed phone of (206) 341-0802. NPI 1164727855 was issued on 01/11/2011.
Medicare Part D records for calendar year 2023 show 527 prescription claims written by this provider, covering 171 Medicare beneficiaries and totaling roughly $79K in drug spend, with an opioid prescribing rate of 9.3%.
Pharmacist is a high-volume specialty nationwide, with 291,043 enrolled providers across 56 states and an average of 135 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 | 1164727855 |
|---|---|
| Specialty | Pharmacist |
| Gender | Male |
| NPI Issued | 01/11/2011 |
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 William Chan. To verify William Chan'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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
527
Total Claims
$79K
Total Drug Cost
171
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,026
- Total Day Supply
- 29,606
- Generic Drug Cost
- $7K
- Opioid Claims
- 49 (9.3% rate)
Patient Demographics
- Average Patient Age
- 74.6 years
- Avg HCC Risk Score
- 1.17
- Gender Split
- 56% female / 44% male
- Age Distribution
- <65: 13, 65-74: 70, 75-84: 65, 85+: 23
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What William Chan prescribes most
Top Medicare Part D drugs by claim count, 2023
- Warfarin Sodium
Warfarin Sodium
136 claims
- Amlodipine Besylate
Amlodipine Besylate
57 claims
- Rosuvastatin Calcium 44
Rosuvastatin Calcium
44 claims
- Irbesartan 21
Irbesartan
21 claims
- Hydrochlorothiazide 18
Hydrochlorothiazide
18 claims
- Hydrocodone-Acetam… 16
Hydrocodone-Acetaminophen
16 claims
- Jardiance 15
Jardiance
15 claims
- Novolog Flexpen 14
Novolog Flexpen
14 claims
| Drug | Claims |
|---|---|
| Warfarin Sodium | 136 |
| Amlodipine Besylate | 57 |
| Rosuvastatin Calcium | 44 |
| Irbesartan | 21 |
| Hydrochlorothiazide | 18 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 16 |
| Jardiance Empagliflozin | 15 |
| Novolog Flexpen Insulin Aspart | 14 |
| Oxycodone Hcl | 14 |
| Ozempic Semaglutide | 14 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Pharmacist Overview
How William Chan fits within the Pharmacist landscape nationally.
291,043
Pharmacist Providers in US
56
States with Pharmacist
135
Avg Claims per Provider
William Chan's 527 claims are above the specialty average of 135.
Nearby Pharmacist Providers in Washington
Other clinicians with the same primary specialty enrolled in Washington, drawn from the same CMS NPPES roster as Chan.
Steven Aahl
Bothell, WA
Dr. Jon Aal
RPH
Olympia, WA
Kenric Aalund-Nelson
Bellingham, WA
Dr. Kevin Aardal
RXT
Richland, WA
Dr. Rania Abaza
PHARMD
Vancouver, WA
Compare Pharmacist 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 Pharmacist 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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How to Find a Doctor
Step-by-step guide to choosing a provider
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Check NPI, board certification & license status
Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore Washington
Frequently Asked Questions
What is William Chan's specialty? ▼
William Chan specializes in Pharmacist and practices in Bellevue, Washington.
How much does William Chan prescribe under Medicare Part D? ▼
In 2023, William Chan wrote 527 Medicare Part D claims totaling $79K in drug costs for 171 beneficiaries.
Where is William Chan located? ▼
William Chan is located at 222 112TH AVE NE, Bellevue, WA, 98004. Phone: (206) 341-0802.
What is William Chan's NPI number? ▼
William Chan's National Provider Identifier (NPI) is 1164727855, issued on 01/11/2011.
Does William Chan prescribe opioids? ▼
Yes, William Chan had 49 opioid claims in 2023 with an opioid prescribing rate of 9.3%.
How many Pharmacist providers are there in the US? ▼
There are 291,043 Pharmacist providers across 56 states in the US. The average Pharmacist provider writes 135 Medicare Part D claims per year.
What drugs does William Chan prescribe most often? ▼
Based on 2023 Medicare Part D data, William Chan's most frequently prescribed drugs include Warfarin Sodium, Amlodipine Besylate, Rosuvastatin Calcium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does William Chan accept Medicare? ▼
William Chan appears in CMS Medicare data with 527 Part D claims and 171 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify William Chan's credentials? ▼
William Chan's NPI is 1164727855. 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.