NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1639238405 MD
Verify on CMS → Patrick Lay, MD
Internal Medicine Physician in Skokie, 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 172,737 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
6K
Medicare Part D claims · 685 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
92%
generic claims · 8% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
93.1/100
▲ 10 pts above national avg 83.5 · Exceptional
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Patrick Lay, MD reported a CMS MIPS final score of 93.1/100 - above the 83.5 national average - and filed 6,032 Medicare Part D claims in 2023.
- 93.1/100
- MIPS score · +10 vs avg
- 6K
- Part D claims, 2023
- 92%
- 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.
Patrick Lay, MD's MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
93 ≥ 69th percentile 69% of 454,083 measured providers are in lower value bands
Each bar is a band; taller bars hold more measured providers. 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 whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Patrick Lay, MD sits
This provider among internal medicine physician peers
Across the 34,612 internal medicine physician providers who report both Medicare Part D prescribing and a MIPS quality score, Patrick Lay, MD writes more Part D claims than 84% of them and scores higher on MIPS quality than 69% - placing this provider in the high-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one internal medicine physician peer from a representative sample of 60; the gold marker is Patrick Lay, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Patrick Lay, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - 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 Patrick Lay, MD?
High performer (top quartile)Primary specialty
Internal Medicine Physician
Medicare Part D claims
6,032 122% vs specialty avg
MIPS final score
93.1/100 9.6 pts vs avg
Specialty distribution in Illinois
How Internal Medicine Physician compares to other specialties among Illinois providers
Medicare quality performance, MIPS
Patrick Lay, MD's 2023 MIPS final score plotted against the Internal Medicine Physician national average
- MIPS Final Score
- 93.1/100
- vs 83.5 national avg · 2023 performance year
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).
Patrick Lay, MD appears in the CMS NPPES registry as an Internal Medicine Physician provider holding MD credentials at 9977 WOODS DR, Skokie, IL, 60077, with a listed phone of (847) 663-8350. NPI 1639238405 was issued on 12/07/2006.
Medicare Part D records for calendar year 2023 show 6,032 prescription claims written by this provider, covering 685 Medicare beneficiaries and totaling roughly $485K in drug spend, split 8% brand-name and 92% generic by claim count, with an opioid prescribing rate of 1.3%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 93.1/100 for the 2023 performance year (Quality 80.8), compared with the 83.5 average among clinicians with a measured score.
Internal Medicine Physician is a high-volume specialty nationwide, with 172,737 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 | 1639238405 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 12/07/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
93.0872
Final Score
Measured-score avg: 83.5
80.7919
Quality
100
Promoting Interoperability
Reporting: Alternative Payment Model
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 Patrick Lay, MD. To verify Patrick Lay, MD'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 · Generic-heavy
Patrick Lay, MD - brand share 8.0%
Internal Medicine Physician average
8% brand-name claims vs 92% generic, on 6,032 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.
6,032
Total Claims
$485K
Total Drug Cost
685
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 16,071
- Total Day Supply
- 475,101
- Brand vs Generic
- 8% brand / 92% generic
- Brand Drug Cost
- $366K
- Generic Drug Cost
- $117K
- Opioid Claims
- 79 (1.3% rate)
- Antibiotic Claims
- 46
Patient Demographics
- Average Patient Age
- 75.5 years
- Avg HCC Risk Score
- 1.07
- Gender Split
- 45% female / 55% male
- Age Distribution
- <65: 29, 65-74: 299, 75-84: 257, 85+: 100
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Patrick Lay, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
794 claims
- Amlodipine Besylate
Amlodipine Besylate
516 claims
- Losartan Potassium
Losartan Potassium
392 claims
- Metformin Hcl
Metformin Hcl
342 claims
- Levothyroxine Sodium 201
Levothyroxine Sodium
201 claims
- Metoprolol Succinate 179
Metoprolol Succinate
179 claims
- Omeprazole 173
Omeprazole
173 claims
- Simvastatin 165
Simvastatin
165 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 794 |
| Amlodipine Besylate | 516 |
| Losartan Potassium | 392 |
| Metformin Hcl | 342 |
| Levothyroxine Sodium | 201 |
| Metoprolol Succinate | 179 |
| Omeprazole | 173 |
| Simvastatin | 165 |
| Lisinopril | 154 |
| Tamsulosin Hcl | 150 |
* 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 Patrick Lay, MD fits within the Internal Medicine Physician landscape nationally.
172,737
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,716
Avg Claims per Provider
Patrick Lay, MD's 6,032 claims are above the specialty average of 2,716.
Nearby Internal Medicine Physician Providers in Illinois
Other clinicians with the same primary specialty enrolled in Illinois, drawn from the same CMS NPPES roster as Lay.
One of 8,383 Internal Medicine Physician providers enrolled in Illinois, 5 are shown here.
Dr. Hasan Abad
D.O.
Chicago, IL
Dr. Peter Abadeer
D.O.
Bloomington, IL
Dr. Pamela Abadi
D.O.
Winfield, IL
Dr. Motaz Abas
MD
Peoria, IL
Dr. Estefania Abasolo Lopez
MD
Chicago, IL
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 Illinois 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 Patrick Lay, MD's specialty? ▼
Patrick Lay, MD specializes in Internal Medicine Physician and practices in Skokie, Illinois. Credentials: MD.
How much does Patrick Lay, MD prescribe under Medicare Part D? ▼
In 2023, Patrick Lay, MD wrote 6,032 Medicare Part D claims totaling $485K in drug costs for 685 beneficiaries.
What is Patrick Lay, MD's Medicare quality score? ▼
Patrick Lay, MD has a CMS MIPS Final Score of 93.1/100 (Quality: 80.8). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Patrick Lay, MD located? ▼
Patrick Lay, MD is located at 9977 WOODS DR, Skokie, IL, 60077. Phone: (847) 663-8350.
What is Patrick Lay, MD's NPI number? ▼
Patrick Lay, MD's National Provider Identifier (NPI) is 1639238405, issued on 12/07/2006.
Does Patrick Lay, MD prescribe more brand-name or generic drugs? ▼
Patrick Lay, MD's prescribing is 8% brand-name and 92% generic drugs by claim count, with $366K in brand drug costs.
Does Patrick Lay, MD prescribe opioids? ▼
Yes, Patrick Lay, MD had 79 opioid claims in 2023 with an opioid prescribing rate of 1.3%.
How many Internal Medicine Physician providers are there in the US? ▼
There are 172,737 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 Patrick Lay, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Patrick Lay, 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 Patrick Lay, MD accept Medicare? ▼
Patrick Lay, MD appears in CMS Medicare data with 6,032 Part D claims and 685 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Patrick Lay, MD's credentials? ▼
Patrick Lay, MD's NPI is 1639238405 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.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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.