Robert De Wilton Marsh, MD
Medical Oncology Physician · Evanston, IL
Robert De Wilton Marsh, MD is a medical oncology physician with a practice address in Evanston, Illinois, and NPI 1174564116, issued on Jun 9, 2006. Check the license (Illinois 036061670, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Robert De Wilton Marsh
- Credential
- MD
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- 036061670 IL
Self-reported in NPPES; status is on the state search - Practice location
- 2650 Ridge Ave, Evanston, IL 60201
- Phone
- (847) 570-2112
- Enumerated
- Jun 9, 2006
- Record last updated
- Feb 12, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (847) 570-1041
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 182 in Illinois → Look up another NPI →
Also registered at 2650 Ridge Ave
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Verify Robert De Wilton Marsh 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 036061670Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
71% fewer Medicare Part D claims than the average medical oncology physician in 2024
206 Medicare Part D claims for 48 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D. Brand-name drugs were 22% of claims.
Most prescribed
- Ondansetron Hcl21 claims
- Eliquis18 claims
- Prochlorperazine Maleate16 claims
- Creon13 claims
- Imatinib Mesylate13 claims
- Mirtazapine12 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): 93.1 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: $2,164.17
2 payments; by number, the most common kind was consulting fee; the largest payer was Bayer Healthcare Pharmaceuticals Inc. The 3,343 providers of this specialty with any payment received $11,773.47 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.
Robert De Wilton Marsh among 182 medical oncology physician records in Illinois
Robert De Wilton Marsh, MD is one of 182 medical oncology physician records with a practice address in Illinois. 83% 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 11% of them.
- NPI issued2006 · 11% of these records are older, 43% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileNo · 73% of these records are
- Record last updated2021 · 52% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RX0202X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Oncology Physician providers in Illinois
There are 182 medical oncology physician records in Illinois.
All 182 in Illinois → Every provider in Evanston → Medical Oncology Physician nationwide →
The 8 medical oncology physician records with the nearest ZIP codes
- Ami Badami, M.D.Evanston, IL 602011073959565
- Bruce Brockstein, MDEvanston, IL 602011740349695
- Nicholas Campbell, MDEvanston, IL 602011942445648
- Thomas Hensing, MDEvanston, IL 602011932132743
- Marisa Hill, MDEvanston, IL 602011639388226
- Janardan Khandekar, MDEvanston, IL 602011851324503
- Richard Knop, MDEvanston, IL 602011629094958
- Gershon Locker, MDEvanston, IL 602011134145469
Common questions
What is Robert De Wilton Marsh, MD's NPI number?
Robert De Wilton Marsh, MD's National Provider Identifier (NPI) is 1174564116, issued on Jun 9, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Robert De Wilton Marsh, MD located?
The NPPES record lists a practice address at 2650 Ridge Ave, Evanston, IL, 60201. Phone: (847) 570-2112. Providers update this record themselves, so call before visiting.
How can I verify Robert De Wilton Marsh, MD's license?
NPPES lists Illinois license number 036061670, 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 Robert De Wilton Marsh, MD prescribe under Medicare Part D?
In 2024, Robert De Wilton Marsh, MD had 206 Medicare Part D claims for 48 beneficiaries; the average among medical oncology physician prescribers was 703. Part D covers Medicare prescriptions only.
What is Robert De Wilton Marsh, MD's MIPS final score?
The 2023 MIPS final score is 93.1 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.