NPI registry status
Active
2026 NPPES data Family Medicine Physician NPI 1194762765 MD
Verify on CMS → Gary Lewis, MD
Family Medicine Physician in Thiensville, Wisconsin.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 147,760 in Family 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
4K
Medicare Part D claims · 420 beneficiaries · Family Medicine Physician avg: 3K
Generic prescribing
84%
generic claims · 15% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Gary Lewis, MD filed 3,842 Medicare Part D claims in 2023 as a Family Medicine Physician in Thiensville, Wisconsin, prescribing 84% generic.
- 4K
- Part D claims, 2023
- 84%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥91st
- pct by Part D claim volume (lower-bound band)
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.
Federal trust snapshot
What official records show about Gary Lewis, MD
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1194762765), first enumerated 06/01/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 3,842 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1194762765 · Family Medicine Physician
NPI-10 · ENUM-LEGACY · TAX-MEGA · RX-MID · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1194762765
- ENUM-LEGACY 2006
- TAX-MEGA 148K Family Medicine
- RX-MID 3,842
- BOOK-LIGHT 3,587 in Wisconsin
- PHOTO-ENUM Marc Davis · 2006
Gary Lewis, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
3,842 ≥ 91st percentile 91% of 1,370,886 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
Gary Lewis, MD 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 Gary Lewis, MD?
Quality data not reportedPrimary specialty
Family Medicine Physician
Medicare Part D claims
3,842 12% vs specialty avg
Specialty distribution in Wisconsin
How Family Medicine Physician compares to other specialties among Wisconsin 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 Family 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).
Practice Address
Provider Details
| NPI | 1194762765 |
|---|---|
| Specialty | Family Medicine Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 06/01/2006 |
Hospital and facility affiliations
Facilities where Gary Lewis, 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.
Independent Physicians OF Wisconsin LLC
Thiensville, WI
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
Gary Lewis, MD - brand share 15.0%
Family Medicine Physician average
15% brand-name claims vs 84% generic, on 3,842 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.
3,842
Total Claims
$341K
Total Drug Cost
420
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 7,956
- Total Day Supply
- 226,905
- Brand vs Generic
- 15% brand / 84% generic
- Brand Drug Cost
- $270K
- Generic Drug Cost
- $69K
- Opioid Claims
- 24 (0.6% rate)
- Antibiotic Claims
- 94
Patient Demographics
- Average Patient Age
- 74.6 years
- Avg HCC Risk Score
- 0.88
- Gender Split
- 51% female / 49% male
- Age Distribution
- <65: 21, 65-74: 177, 75-84: 188, 85+: 34
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Gary Lewis, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Amlodipine Besylate
Amlodipine Besylate
341 claims
- Lisinopril
Lisinopril
192 claims
- Rosuvastatin Calcium
Rosuvastatin Calcium
169 claims
- Losartan Potassium
Losartan Potassium
165 claims
- Atorvastatin Calcium
Atorvastatin Calcium
140 claims
- Levothyroxine Sodium 123
Levothyroxine Sodium
123 claims
- Simvastatin 102
Simvastatin
102 claims
- Metformin Hcl 97
Metformin Hcl
97 claims
| Drug | Claims |
|---|---|
| Amlodipine Besylate | 341 |
| Lisinopril | 192 |
| Rosuvastatin Calcium | 169 |
| Losartan Potassium | 165 |
| Atorvastatin Calcium | 140 |
| Levothyroxine Sodium | 123 |
| Simvastatin | 102 |
| Metformin Hcl | 97 |
| Arexvy Rsvpref3 Antigen/As01e/Pf | 94 |
| Allopurinol | 66 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Family Medicine Physician Overview
How Gary Lewis, MD fits within the Family Medicine Physician landscape nationally.
147,760
Family Medicine Physician Providers in US
56
States with Family Medicine Physician
3,418
Avg Claims per Provider
Gary Lewis, MD's 3,842 claims are above the specialty average of 3,418.
Nationwide Family Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Lewis, both outside Wisconsin so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Family Medicine Physician Providers in Wisconsin
Other clinicians with the same primary specialty enrolled in Wisconsin, drawn from the same CMS NPPES roster as Lewis.
One of 3,587 Family Medicine Physician providers enrolled in Wisconsin, 5 are shown here.
Dr. Ghudran Abdulal
MD
New Berlin, WI
Dr. Vanessa Abejuela-Matt
D.O.
Mount Pleasant, WI
Dr. Benjamin Abeyta
M.D.
Wauwatosa, WI
Dr. Emily Abeyta
MD
Waukesha, WI
Dr. Islam Abo Al Nadie
MD
Milwaukee, WI
Compare Family Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Gary Lewis, MD's specialty? ▼
Gary Lewis, MD specializes in Family Medicine Physician and practices in Thiensville, Wisconsin. Credentials: MD.
How much does Gary Lewis, MD prescribe under Medicare Part D? ▼
In 2023, Gary Lewis, MD wrote 3,842 Medicare Part D claims totaling $341K in drug costs for 420 beneficiaries.
Where is Gary Lewis, MD located? ▼
Gary Lewis, MD is located at 136 N MAIN ST, Thiensville, WI, 53092. Phone: (262) 242-3369.
What is Gary Lewis, MD's NPI number? ▼
Gary Lewis, MD's National Provider Identifier (NPI) is 1194762765, issued on 06/01/2006.
Does Gary Lewis, MD prescribe more brand-name or generic drugs? ▼
Gary Lewis, MD's prescribing is 15% brand-name and 84% generic drugs by claim count, with $270K in brand drug costs.
Does Gary Lewis, MD prescribe opioids? ▼
Yes, Gary Lewis, MD had 24 opioid claims in 2023 with an opioid prescribing rate of 0.6%.
How many Family Medicine Physician providers are there in the US? ▼
There are 147,760 Family Medicine Physician providers across 56 states in the US. The average Family Medicine Physician provider writes 3,418 Medicare Part D claims per year.
What drugs does Gary Lewis, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Gary Lewis, MD's most frequently prescribed drugs include Amlodipine Besylate, Lisinopril, Rosuvastatin Calcium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Gary Lewis, MD accept Medicare? ▼
Gary Lewis, MD appears in CMS Medicare data with 3,842 Part D claims and 420 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Gary Lewis, MD's credentials? ▼
Gary Lewis, MD's NPI is 1194762765 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
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.