Ellen Cy Kwan, MD
Family Medicine Physician · Medfield, MA
Ellen Cy Kwan, MD is a family medicine physician with a practice address in Medfield, Massachusetts, and NPI 1265429815, issued on Sep 29, 2005. Check the license (Massachusetts 213052, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Ellen Cy Kwan
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 213052 MA
Self-reported in NPPES; status is on the state search - Practice location
- 50 North St, Medfield, MA 02052
- Phone
- (508) 359-1519
- Enumerated
- Sep 29, 2005
- Record last updated
- Feb 28, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (508) 359-4345
- Medicaid ID
- 0171638 MA
- Medicare enrollment
- Enrolled (PECOS I20080408000183); accepts Medicare assignment
- Medical or professional school
- State University Of New York At Stony Brook, School Of Medicine, 1999
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 50 North St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Ellen Cy Kwan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 213052Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
34% fewer Medicare Part D claims than the average family medicine physician in 2024
2,331 Medicare Part D claims for 182 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. 45 claims were for opioids.
Most prescribed
- Atorvastatin Calcium160 claims
- Levothyroxine Sodium147 claims
- Lisinopril97 claims
- Hydrochlorothiazide91 claims
- Metoprolol Succinate76 claims
- Amlodipine Besylate66 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: $24.73
1 payment: food and beverage; the largest payer was Pfizer Inc. The 55,478 providers of this specialty with any payment received $902.55 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
- Medical Care OF Boston Management CorporationSharon, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
6 family medicine physician records list a practice address in Medfield
They are 6 of the 221 NPPES records with a practice address in Medfield, and 2,265 family medicine physician records in Massachusetts.
All 6 in Medfield → All 2,265 in Massachusetts → Every provider in Medfield →
Other family medicine physician records in Massachusetts
- Salah Abass, M.D.Methuen, MA1417959776
- Majed Abbas, MDLowell, MA1346827870
- Sheila Abdallah, MDWorcester, MA1821356312
- Omar Abduljabar, M.D.Springfield, MA1770978843
- Jonathan Abel, DOSpringfield, MA1700897196
- Mohamed Abib, MDSturbridge, MA1639281090
- Kevin Abraham, M.D.Worcester, MA1689037673
- Janet Abrahamian, M.D.West Boylston, MA1932156627
- John Abramson, M.D.Ipswich, MA1275613903
- John Paul Abroguena, MDPlainville, MA1235361080
Common questions
What is Ellen Cy Kwan, MD's NPI number?
Ellen Cy Kwan, MD's National Provider Identifier (NPI) is 1265429815, issued on Sep 29, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Ellen Cy Kwan, MD located?
The NPPES record lists a practice address at 50 North St, Medfield, MA, 02052. Phone: (508) 359-1519. Providers update this record themselves, so call before visiting.
How can I verify Ellen Cy Kwan, MD's license?
NPPES lists Massachusetts license number 213052, 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 Ellen Cy Kwan, MD prescribe under Medicare Part D?
In 2024, Ellen Cy Kwan, MD had 2,331 Medicare Part D claims for 182 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.