NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1457338006 M.D.
Verify on CMS → William Anderson, M.D.
Internal Medicine Physician in Wayzata, Minnesota.
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
12K
Medicare Part D claims · 887 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
89%
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
William Anderson, M.D. filed 12,383 Medicare Part D claims in 2023 as a Internal Medicine Physician in Wayzata, Minnesota, prescribing 89% generic.
- 12K
- Part D claims, 2023
- 89%
- 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.
William Anderson, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
12,383 Top 2% higher than 98% 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)
William Anderson, 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 William Anderson, M.D.?
Quality data not reportedPrimary specialty
Internal Medicine Physician
Medicare Part D claims
12,383 356% vs specialty avg
Specialty distribution in Minnesota
How Internal Medicine Physician compares to other specialties among Minnesota 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).
William Anderson, M.D. appears in the CMS NPPES registry as a Internal Medicine Physician provider holding M.D. credentials at 250 CENTRAL AVE N, Wayzata, MN, 55391, with a listed phone of (952) 993-8250. NPI 1457338006 was issued on 12/26/2005.
Medicare Part D records for calendar year 2023 show 12,383 prescription claims written by this provider, covering 887 Medicare beneficiaries and totaling roughly $1.1 million in drug spend, split 10% brand-name and 89% generic by claim count, with an opioid prescribing rate of 1.6%.
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 | 1457338006 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 12/26/2005 |
Hospital and facility affiliations
Facilities where William Anderson, 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.
Park Nicollet Clinic
Minnetonka, MN
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Brand vs generic prescribing mix · Typical
William Anderson, M.D. - brand share 10.0%
Internal Medicine Physician average
10% brand-name claims vs 89% generic, on 12,383 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.
12,383
Total Claims
$1.1M
Total Drug Cost
887
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 31,335
- Total Day Supply
- 917,597
- Brand vs Generic
- 10% brand / 89% generic
- Brand Drug Cost
- $857K
- Generic Drug Cost
- $261K
- Opioid Claims
- 198 (1.6% rate)
- Antibiotic Claims
- 261
Patient Demographics
- Average Patient Age
- 76.7 years
- Avg HCC Risk Score
- 0.98
- Gender Split
- 44% female / 56% male
- Age Distribution
- <65: 12, 65-74: 356, 75-84: 378, 85+: 141
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What William Anderson, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
1,093 claims
- Losartan Potassium
Losartan Potassium
774 claims
- Amlodipine Besylate
Amlodipine Besylate
703 claims
- Hydrochlorothiazide
Hydrochlorothiazide
508 claims
- Levothyroxine Sodium
Levothyroxine Sodium
494 claims
- Lisinopril
Lisinopril
494 claims
- Rosuvastatin Calcium 414
Rosuvastatin Calcium
414 claims
- Metoprolol Succinate 409
Metoprolol Succinate
409 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 1,093 |
| Losartan Potassium | 774 |
| Amlodipine Besylate | 703 |
| Hydrochlorothiazide | 508 |
| Levothyroxine Sodium | 494 |
| Lisinopril | 494 |
| Rosuvastatin Calcium | 414 |
| Metoprolol Succinate | 409 |
| Omeprazole | 391 |
| Simvastatin | 287 |
* 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 William Anderson, M.D. 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
William Anderson, M.D.'s 12,383 claims are above the specialty average of 2,716.
Nearby Internal Medicine Physician Providers in Minnesota
Other clinicians with the same primary specialty enrolled in Minnesota, drawn from the same CMS NPPES roster as Anderson.
Dr. Christopher Aakre
MD
Rochester, MN
Dr. Karen Aarestad
MD
Brainerd, MN
Dr. Peter Aas
MD
Duluth, MN
Dr. Saud Abaalkhail
M.B.,B.S.
Minneapolis, MN
Dr. Mohamad Abbas
M.D.
Saint Paul, MN
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 Minnesota 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.
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Frequently Asked Questions
What is William Anderson, M.D.'s specialty? ▼
William Anderson, M.D. specializes in Internal Medicine Physician and practices in Wayzata, Minnesota. Credentials: M.D..
How much does William Anderson, M.D. prescribe under Medicare Part D? ▼
In 2023, William Anderson, M.D. wrote 12,383 Medicare Part D claims totaling $1.1M in drug costs for 887 beneficiaries.
Where is William Anderson, M.D. located? ▼
William Anderson, M.D. is located at 250 CENTRAL AVE N, Wayzata, MN, 55391. Phone: (952) 993-8250.
What is William Anderson, M.D.'s NPI number? ▼
William Anderson, M.D.'s National Provider Identifier (NPI) is 1457338006, issued on 12/26/2005.
Does William Anderson, M.D. prescribe more brand-name or generic drugs? ▼
William Anderson, M.D.'s prescribing is 10% brand-name and 89% generic drugs by claim count, with $857K in brand drug costs.
Does William Anderson, M.D. prescribe opioids? ▼
Yes, William Anderson, M.D. had 198 opioid claims in 2023 with an opioid prescribing rate of 1.6%.
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 William Anderson, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, William Anderson, M.D.'s most frequently prescribed drugs include Atorvastatin Calcium, Losartan Potassium, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does William Anderson, M.D. accept Medicare? ▼
William Anderson, M.D. appears in CMS Medicare data with 12,383 Part D claims and 887 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify William Anderson, M.D.'s credentials? ▼
William Anderson, M.D.'s NPI is 1457338006 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.