NPI registry status
Active
2026 NPPES data Urology Physician NPI 1023098910 M.D.
Verify on CMS → Gregory Lewis, M.D.
Urology Physician in Joliet, Illinois.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 13,367 in Urology 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
400
Medicare Part D claims · 167 beneficiaries · Urology Physician avg: 1K
Generic prescribing
84%
generic claims · 16% 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
Gregory Lewis, M.D. filed 400 Medicare Part D claims in 2023 as a Urology Physician in Joliet, Illinois, prescribing 84% generic.
- 400
- Part D claims, 2023
- 84%
- generic prescribing
- ≥62nd
- 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.
CMS NPPES provider registry desk
NPI 1023098910 · Urology Physician
NPI-10 · ENUM-LEGACY · TAX-MID · RX-LIGHT · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1023098910
- ENUM-LEGACY 2006
- TAX-MID 13K Urology Physician
- RX-LIGHT 400
- BOOK-LIGHT 566 in Illinois
- PHOTO-ENUM Christopher Marsh · 2006
Gregory Lewis, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
400 ≥ 62nd percentile 62% 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-eligible specialty (heuristic, not verified)
Gregory Lewis, M.D. practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Gregory Lewis, M.D.?
Quality data not reportedPrimary specialty
Urology Physician
Medicare Part D claims
400 69% vs specialty avg
Specialty distribution in Illinois
How Urology Physician compares to other specialties among Illinois 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 Urology 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 | 1023098910 |
|---|---|
| Specialty | Urology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 01/18/2006 |
License & disciplinary context - Illinois IDFPR 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 ~42K Illinois medical licensees in 2023 - they are NOT specific to Gregory Lewis, M.D.. To verify Gregory Lewis, M.D.'s current license status, search the IDFPR public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
106
Total board actions, Illinois 2023
Across 103 cases
2.52
Actions per 1,000 licensees
Illinois statewide rate
probation
Most common action type
38 cases
IDFPR 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 Illinois disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
Gregory Lewis, M.D. - brand share 16.0%
Urology Physician average
16% brand-name claims vs 84% generic, on 400 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.
400
Total Claims
$59K
Total Drug Cost
167
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 899
- Total Day Supply
- 25,950
- Brand vs Generic
- 16% brand / 84% generic
- Brand Drug Cost
- $50K
- Generic Drug Cost
- $9K
- Antibiotic Claims
- 45
Patient Demographics
- Average Patient Age
- 76.2 years
- Avg HCC Risk Score
- 1.47
- Gender Split
- 25% female / 75% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Gregory Lewis, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Tamsulosin Hcl
Tamsulosin Hcl
75 claims
- Finasteride
Finasteride
63 claims
- Ezetimibe 29
Ezetimibe
29 claims
- Myrbetriq 24
Myrbetriq
24 claims
- Rosuvastatin Calcium 21
Rosuvastatin Calcium
21 claims
- Sulfamethoxazole-T… 17
Sulfamethoxazole-Trimethoprim
17 claims
- Xarelto 13
Xarelto
13 claims
- Oxybutynin Chlorid… 12
Oxybutynin Chloride Er
12 claims
| Drug | Claims |
|---|---|
| Tamsulosin Hcl | 75 |
| Finasteride | 63 |
| Ezetimibe | 29 |
| Myrbetriq Mirabegron | 24 |
| Rosuvastatin Calcium | 21 |
| Sulfamethoxazole-Trimethoprim Sulfamethoxazole/Trimethoprim | 17 |
| Xarelto Rivaroxaban | 13 |
| Oxybutynin Chloride Er Oxybutynin Chloride | 12 |
| Eliquis Apixaban | 11 |
| Gemtesa Vibegron | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Urology Physician Overview
How Gregory Lewis, M.D. fits within the Urology Physician landscape nationally.
13,367
Urology Physician Providers in US
54
States with Urology Physician
1,280
Avg Claims per Provider
Gregory Lewis, M.D.'s 400 claims are below the specialty average of 1,280.
Nationwide Urology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Lewis, both outside Illinois 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 Urology Physician Providers in Illinois
Other clinicians with the same primary specialty enrolled in Illinois, drawn from the same CMS NPPES roster as Lewis.
One of 566 Urology Physician providers enrolled in Illinois, 5 are shown here.
Dr. Michael Abern
M.D.
Chicago, IL
Dr. Omer Acar
MD
Chicago, IL
Dr. Melanie Adamsky
M.D.
Melrose Park, IL
Piyush Agarwal
Chicago, IL
Dr. Arif Agha
MD
Oak Brook, IL
Compare Urology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Gregory Lewis, M.D.'s specialty? ▼
Gregory Lewis, M.D. specializes in Urology Physician and practices in Joliet, Illinois. Credentials: M.D..
How much does Gregory Lewis, M.D. prescribe under Medicare Part D? ▼
In 2023, Gregory Lewis, M.D. wrote 400 Medicare Part D claims totaling $59K in drug costs for 167 beneficiaries.
Where is Gregory Lewis, M.D. located? ▼
Gregory Lewis, M.D. is located at 1541 RIVERBOAT CENTER DR, Joliet, IL, 60431. Phone: (815) 409-4930.
What is Gregory Lewis, M.D.'s NPI number? ▼
Gregory Lewis, M.D.'s National Provider Identifier (NPI) is 1023098910, issued on 01/18/2006.
Does Gregory Lewis, M.D. prescribe more brand-name or generic drugs? ▼
Gregory Lewis, M.D.'s prescribing is 16% brand-name and 84% generic drugs by claim count, with $50K in brand drug costs.
How many Urology Physician providers are there in the US? ▼
There are 13,367 Urology Physician providers across 54 states in the US. The average Urology Physician provider writes 1,280 Medicare Part D claims per year.
What drugs does Gregory Lewis, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Gregory Lewis, M.D.'s most frequently prescribed drugs include Tamsulosin Hcl, Finasteride, Ezetimibe. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Gregory Lewis, M.D. accept Medicare? ▼
Gregory Lewis, M.D. appears in CMS Medicare data with 400 Part D claims and 167 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Gregory Lewis, M.D.'s credentials? ▼
Gregory Lewis, M.D.'s NPI is 1023098910 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
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.