Marc Posner, M.D.
Radiation Oncology Physician · Lake Forest, IL
Marc Posner, M.D. is a radiation oncology physician with a practice address in Lake Forest, Illinois, and NPI 1871569574, issued on Feb 23, 2006. Check the license (Illinois 036102182, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Marc Posner
- Credential
- M.D.
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- 036102182 IL
Self-reported in NPPES; status is on the state search - Practice location
- 660 N Westmoreland RD, Lake Forest, IL 60045
- Phone
- (847) 535-6135
- Enumerated
- Feb 23, 2006
- Record last updated
- Sep 2, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (847) 535-7858
- Medicaid ID
- 036102182 IL
- Medicare enrollment
- Enrolled (PECOS I20100624000298); accepts Medicare assignment
- Medical or professional school
- Harvard Medical School, 1995
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 277 in Illinois → Look up another NPI →
Also registered at 660 N Westmoreland RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kathleen Abernathy, R.D., L.D.N.Registered Dietitian1295020063
- Sushma Anand, D.O.Obstetrics & Gynecology Physician1285950352
- Michael Ankin, M.D.Pulmonary Disease Physician1922117878
- Kristen Ballard, PT, DPTPhysical Therapist1700070497
- Amy Barnard, APNCritical Care Medicine Clinical Nurse Specialist1023420163
- Christina Baron, R.D.Registered Dietitian1770879397
Verify Marc Posner 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 036102182Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
64% fewer Medicare Part D claims than the average radiation oncology physician in 2024
48 Medicare Part D claims for 21 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Tamsulosin Hcl40 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): 94.1 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).
Industry payments in 2024: $2,518.50
5 payments; by number, the most common kind was food and beverage; the largest payer was Elekta, Inc. The 3,275 providers of this specialty with any payment received $1,897.85 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Northwestern Medical Faculty FoundationLake Forest, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Marc Posner among 277 radiation oncology physician records in Illinois
Marc Posner, M.D. is one of 277 radiation oncology physician records with a practice address in Illinois. 78% 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 19% of them.
- NPI issued2006 · 19% of these records are older, 51% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated1995 · median 2004 among the 184 with a school on file
- Record last updated2014 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0001X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Radiation Oncology Physician providers in Illinois
There are 277 radiation oncology physician records in Illinois.
All 277 in Illinois → Every provider in Lake Forest → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Joseph Imperato, M.D.Lake Forest, IL 600451346215183
- Joy Coleman, M.D.Libertyville, IL 600481598872111
- Dean Conterato, MDLibertyville, IL 600481033110192
- Majid Mohiuddin, M.D.Libertyville, IL 600481568415065
- James Ruffer, M.D.Libertyville, IL 600481679564629
- Terrence Bugno, MDMcHenry, IL 600501235163437
- Shunqing Zhang, MDMcHenry, IL 600501649773425
- Rena Zimmerman, M.D.McHenry, IL 600501851350318
Common questions
What is Marc Posner, M.D.'s NPI number?
Marc Posner, M.D.'s National Provider Identifier (NPI) is 1871569574, issued on Feb 23, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Marc Posner, M.D. located?
The NPPES record lists a practice address at 660 N Westmoreland RD, Lake Forest, IL, 60045. Phone: (847) 535-6135. Providers update this record themselves, so call before visiting.
How can I verify Marc Posner, M.D.'s license?
NPPES lists Illinois license number 036102182, 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 Marc Posner, M.D. prescribe under Medicare Part D?
In 2024, Marc Posner, M.D. had 48 Medicare Part D claims for 21 beneficiaries; the average among radiation oncology physician prescribers was 134. Part D covers Medicare prescriptions only.
What is Marc Posner, M.D.'s MIPS final score?
The 2023 MIPS final score is 94.1 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.