NPI registry status
Active
2026 NPPES data Interventional Cardiology Physician NPI 1215465307 MD
Verify on CMS → Willis Ko, MD
Interventional Cardiology Physician in Maryville, 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 3,400 in Interventional Cardiology 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
166
Medicare Part D claims · 55 beneficiaries · Interventional Cardiology Physician avg: 3K
Generic prescribing
88%
generic claims · 12% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$1.1K
31 payments · CMS Open Payments (Sunshine Act)
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
Willis Ko, MD filed 166 Medicare Part D claims in 2023 as a Interventional Cardiology Physician in Maryville, Illinois, prescribing 88% generic.
- 166
- Part D claims, 2023
- 88%
- 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.
Willis Ko, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
166 35th percentile higher than 35% 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)
Willis Ko, 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 Willis Ko, MD?
Quality data not reportedPrimary specialty
Interventional Cardiology Physician
Medicare Part D claims
166 94% vs specialty avg
Specialty distribution in Illinois
How Interventional Cardiology 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 Interventional Cardiology 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).
Willis Ko, MD appears in the CMS NPPES registry as an Interventional Cardiology Physician provider holding MD credentials at 6810 STATE ROUTE 162 STE 102B, Maryville, IL, 62062, with a listed phone of (618) 288-4076. NPI 1215465307 was issued on 06/01/2017.
Medicare Part D records for calendar year 2023 show 166 prescription claims written by this provider, covering 55 Medicare beneficiaries and totaling roughly $17K in drug spend, split 12% brand-name and 88% generic by claim count.
Interventional Cardiology Physician is a narrow specialty nationwide, with 3,400 enrolled providers across 53 states and an average of 2,984 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 | 1215465307 |
|---|---|
| Specialty | Interventional Cardiology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 06/01/2017 |
Hospital and facility affiliations
Facilities where Willis Ko, 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.
Fairview Heights Medical Group SC
Alton, IL
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Willis Ko, MD. Source: openpaymentsdata.cms.gov.
Total received
$1.1K
Largest payer
Medtronic, Inc.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
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 Willis Ko, MD. To verify Willis Ko, 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 · Typical
Willis Ko, MD - brand share 12.0%
Interventional Cardiology Physician average
12% brand-name claims vs 88% generic, on 166 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.
166
Total Claims
$17K
Total Drug Cost
55
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 377
- Total Day Supply
- 11,194
- Brand vs Generic
- 12% brand / 88% generic
- Brand Drug Cost
- $15K
- Generic Drug Cost
- $2K
Patient Demographics
- Average Patient Age
- 74.3 years
- Avg HCC Risk Score
- 3.06
- Gender Split
- 51% female / 49% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Willis Ko, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Clopidogrel
Clopidogrel
50 claims
- Atorvastatin Calcium
Atorvastatin Calcium
23 claims
- Carvedilol 15
Carvedilol
15 claims
| Drug | Claims |
|---|---|
| Clopidogrel Clopidogrel Bisulfate | 50 |
| Atorvastatin Calcium | 23 |
| Carvedilol | 15 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Interventional Cardiology Physician Overview
How Willis Ko, MD fits within the Interventional Cardiology Physician landscape nationally.
3,400
Interventional Cardiology Physician Providers in US
53
States with Interventional Cardiology Physician
2,984
Avg Claims per Provider
Willis Ko, MD's 166 claims are below the specialty average of 2,984.
Nearby Interventional Cardiology Physician Providers in Illinois
Other clinicians with the same primary specialty enrolled in Illinois, drawn from the same CMS NPPES roster as Ko.
Dr. Alaa Abdel Meguid
MD
Kankakee, IL
Dr. Owais Abdul-Kafi
MD
Lake Forest, IL
Dr. Majed Afana
MD
Palos Heights, IL
Dr. Sunil Agarwal
M.D, M.P.H., PHD
Springfield, IL
Dr. Bhuvnesh Aggarwal
M.D.
Springfield, IL
Compare Interventional Cardiology 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 Interventional Cardiology 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 Willis Ko, MD's specialty? ▼
Willis Ko, MD specializes in Interventional Cardiology Physician and practices in Maryville, Illinois. Credentials: MD.
How much does Willis Ko, MD prescribe under Medicare Part D? ▼
In 2023, Willis Ko, MD wrote 166 Medicare Part D claims totaling $17K in drug costs for 55 beneficiaries.
Where is Willis Ko, MD located? ▼
Willis Ko, MD is located at 6810 STATE ROUTE 162 STE 102B, Maryville, IL, 62062. Phone: (618) 288-4076.
What is Willis Ko, MD's NPI number? ▼
Willis Ko, MD's National Provider Identifier (NPI) is 1215465307, issued on 06/01/2017.
Does Willis Ko, MD prescribe more brand-name or generic drugs? ▼
Willis Ko, MD's prescribing is 12% brand-name and 88% generic drugs by claim count, with $15K in brand drug costs.
How many Interventional Cardiology Physician providers are there in the US? ▼
There are 3,400 Interventional Cardiology Physician providers across 53 states in the US. The average Interventional Cardiology Physician provider writes 2,984 Medicare Part D claims per year.
What drugs does Willis Ko, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Willis Ko, MD's most frequently prescribed drugs include Clopidogrel, Atorvastatin Calcium, Carvedilol. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Willis Ko, MD accept Medicare? ▼
Willis Ko, MD appears in CMS Medicare data with 166 Part D claims and 55 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Willis Ko, MD's credentials? ▼
Willis Ko, MD's NPI is 1215465307 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
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.