Marwan Massouh, MD
Hematology & Oncology Physician · Westlake, OH
Marwan Massouh, MD is a hematology & oncology physician with a practice address in Westlake, Ohio, and NPI 1508841669, issued on Dec 13, 2005. Check the license (Ohio 35056179, as entered in NPPES) on the State Medical Board of Ohio; the Medicare figures below come from public CMS files.
- Name
- Marwan Massouh
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- 35056179 OH
Self-reported in NPPES; status is on the state search - Practice location
- 29101 Health Campus Dr, Westlake, OH 44145
- Phone
- (440) 808-6500
- Enumerated
- Dec 13, 2005
- Record last updated
- Jul 13, 2026
- Fax
- (440) 808-8865
- Medicaid ID
- 0848382 OH
- Medicare enrollment
- Enrolled (PECOS I20150921002541); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 513 in Ohio → Look up another NPI →
Also registered at 29101 Health Campus Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Marwan Massouh in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersState Medical Board of Ohio
Search for license 35056179Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4% more Medicare Part D claims than the average hematology & oncology physician in 2024
910 Medicare Part D claims for 193 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 21% of claims. 43 claims were for opioids.
Most prescribed
- Potassium Chloride83 claims
- Letrozole71 claims
- Eliquis42 claims
- Prednisone37 claims
- Xtandi32 claims
- Xarelto31 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.
Industry payments in 2024: $62.28
1 payment: food and beverage; the largest payer was Emd Serono, Inc. The 8,560 providers of this specialty with any payment received $7,481.41 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
- Scl Health Medical Group-Butte LLCButte, MT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Marwan Massouh among 513 hematology & oncology physician records in Ohio
Marwan Massouh, MD is one of 513 hematology & oncology physician records with a practice address in Ohio. 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 84% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated1982 · median 2001 among the 369 with a school on file
- Record last updated2026 · 53% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a Ohio practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in Ohio
There are 513 hematology & oncology physician records in Ohio.
All 513 in Ohio → Every provider in Westlake → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Richard Chang, MDWestlake, OH 441451285620468
- Alan Lubin, MDMayfield Hts, OH 441431265439442
- Dale Cowan, MDBrecksville, OH 441411548374739
- James SchusterStrongsville, OH 441361730611682
- Elnora Spradling, MDStrongsville, OH 441361194040493
- Jason Valent, M.D.Strongsville, OH 441361013936871
- Bennett Yu, M.D.Strongsville, OH 441361609922343
- Housam Haddad, MDIndependence, OH 441311497042832
Common questions
What is Marwan Massouh, MD's NPI number?
Marwan Massouh, MD's National Provider Identifier (NPI) is 1508841669, issued on Dec 13, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Marwan Massouh, MD located?
The NPPES record lists a practice address at 29101 Health Campus Dr, Westlake, OH, 44145. Phone: (440) 808-6500. Providers update this record themselves, so call before visiting.
How can I verify Marwan Massouh, MD's license?
NPPES lists Ohio license number 35056179, as entered by the provider. Search the State Medical Board of Ohio at https://elicense.ohio.gov/oh_verifylicense. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Marwan Massouh, MD prescribe under Medicare Part D?
In 2024, Marwan Massouh, MD had 910 Medicare Part D claims for 193 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
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.