Wendi G. Marcus, M.D.
Internal Medicine Physician · Buffalo Grove, IL
Wendi G. Marcus, M.D. is an internal medicine physician with a practice address in Buffalo Grove, Illinois, and NPI 1548249113, issued on Jan 12, 2006. Check the license (Illinois 036086159, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Wendi G. Marcus
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036086159 IL
Self-reported in NPPES; status is on the state search - Practice location
- 15 S Mchenry RD, Buffalo Grove, IL 60089
- Phone
- (847) 618-0351
- Enumerated
- Jan 12, 2006
- Record last updated
- Oct 5, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (847) 618-0766
- Medicaid ID
- 36086159 IL
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 15 S Mchenry RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Reena Blesson, APN-CNPNurse Practitioner1619221900
- Taylor Burke, APN-CNPNurse Practitioner1982338844
- Daniel Cacioppo, MDNeurology Physician1083662613
- Heidi Chatham, M.DFamily Medicine Physician1659509834
- Caitlin Daab, MDFamily Medicine Physician1326781394
Verify Wendi G. Marcus in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036086159Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
26% more Medicare Part D claims than the average internal medicine physician in 2024
4,004 Medicare Part D claims for 341 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 34 claims were for opioids.
Most prescribed
- Atorvastatin Calcium350 claims
- Levothyroxine Sodium255 claims
- Amlodipine Besylate199 claims
- Simvastatin193 claims
- Lisinopril174 claims
- Omeprazole138 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 89.7 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Wendi G. Marcus among 7,238 internal medicine physician records in Illinois
Wendi G. Marcus, M.D. is one of 7,238 internal medicine physician records with a practice address in Illinois. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 61% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- Record last updated2021 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
24 internal medicine physician records list a practice address in Buffalo Grove
They are 24 of the 868 NPPES records with a practice address in Buffalo Grove, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Buffalo Grove → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- David Charman, M.D.Buffalo Grove, IL 600891346228954
- Mark Charman, M.D.Buffalo Grove, IL 600891033197637
- Stuart Ferber, M.D.Buffalo Grove, IL 600891952389413
- Irina Goldvekht, D.O.Buffalo Grove, IL 600891154309755
- Thomas Heggen, MDBuffalo Grove, IL 600891710974860
- Gabriel Kibrit, MDBuffalo Grove, IL 600891477531937
- Carl Lang, M.D.Buffalo Grove, IL 600891730167339
- Jules Marks, D.O.Buffalo Grove, IL 600891346228814
Common questions
What is Wendi G. Marcus, M.D.'s NPI number?
Wendi G. Marcus, M.D.'s National Provider Identifier (NPI) is 1548249113, issued on Jan 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Wendi G. Marcus, M.D. located?
The NPPES record lists a practice address at 15 S Mchenry RD, Buffalo Grove, IL, 60089. Phone: (847) 618-0351. Providers update this record themselves, so call before visiting.
How can I verify Wendi G. Marcus, M.D.'s license?
NPPES lists Illinois license number 036086159, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Wendi G. Marcus, M.D. prescribe under Medicare Part D?
In 2024, Wendi G. Marcus, M.D. had 4,004 Medicare Part D claims for 341 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Wendi G. Marcus, M.D.'s MIPS final score?
The 2023 MIPS final score is 89.7 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.