Wassim Assaf, MD
Sleep Medicine (Internal Medicine) Physician · Auburn, MA
Wassim Assaf, MD is a sleep medicine (internal medicine) physician with a practice address in Auburn, Massachusetts, and NPI 1548400278, issued on Feb 20, 2009. Check the license (Massachusetts 265574, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Wassim Assaf
- Credential
- MD
- Primary taxonomy
- Sleep Medicine (Internal Medicine) Physician 207RS0012X
- License number
- 265574 MA
Self-reported in NPPES; status is on the state search - Practice location
- 48 Auburn St Ste 1, Auburn, MA 01501
- Phone
- (774) 772-7058
- Enumerated
- Feb 20, 2009
- Record last updated
- Feb 3, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (774) 772-7059
- Medicare enrollment
- Enrolled (PECOS I20180508002298); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Verify Wassim Assaf in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 265574Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
56% fewer Medicare Part D claims than the average sleep medicine (internal medicine) physician in 2024
255 Medicare Part D claims for 112 beneficiaries, against an average of 585 among the 852 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims.
Most prescribed
- Cefpodoxime Proxetil26 claims
- Prednisone17 claims
- Gabapentin16 claims
- Zolpidem Tartrate14 claims
- Dextroamphetamine-Amphetamine13 claims
- Pantoprazole Sodium13 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: $56.47
2 payments; by number, the most common kind was food and beverage; the largest payer was Inspire Medical Systems, Inc. The 664 providers of this specialty with any payment received $3,724.37 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.
Sleep Medicine (Internal Medicine) Physician providers in Massachusetts
There are 34 sleep medicine (internal medicine) physician records in Massachusetts.
Other sleep medicine (internal medicine) physician records in Massachusetts
- Anjali Ahn, M.D.Boston, MA1467566182
- Amit Anand, M.D.Boston, MA1528099447
- Samia Ayub, M.B.B.SBoston, MA1801160668
- Neil Bach, MDGreenfield, MA1407819626
- Salma Batool-Anwar, MBBS, MPHBoston, MA1285624916
- Elizabeth BengeBoston, MA1144857202
- Suzanne Bertisch, M.D., M.P.H.Boston, MA1710078936
- Rohit Budhiraja, M.D.Boston, MA1497772164
- Nilika Chaudhary, MDBoston, MA1396163986
- Ting-Hsu Chen, MDBoston, MA1235163643
Common questions
What is Wassim Assaf, MD's NPI number?
Wassim Assaf, MD's National Provider Identifier (NPI) is 1548400278, issued on Feb 20, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Wassim Assaf, MD located?
The NPPES record lists a practice address at 48 Auburn St Ste 1, Auburn, MA, 01501. Phone: (774) 772-7058. Providers update this record themselves, so call before visiting.
How can I verify Wassim Assaf, MD's license?
NPPES lists Massachusetts license number 265574, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Wassim Assaf, MD prescribe under Medicare Part D?
In 2024, Wassim Assaf, MD had 255 Medicare Part D claims for 112 beneficiaries; the average among sleep medicine (internal medicine) physician prescribers was 585. 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.