Michael William Kalfopoulos, MD
Internal Medicine Physician · Worcester, MA
Michael William Kalfopoulos, MD is an internal medicine physician with a practice address in Worcester, Massachusetts, and NPI 1235634320, issued on Mar 29, 2018. Check the license (Massachusetts 288033, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Michael William Kalfopoulos
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 288033 MA
Self-reported in NPPES; status is on the state search - Practice location
- 119 Belmont St, Worcester, MA 01605
- Phone
- (508) 334-8515
- Enumerated
- Mar 29, 2018
- Record last updated
- Sep 2, 2022
- Fax
- (508) 334-6490
- Medicare enrollment
- Enrolled (PECOS I20220922003318); accepts Medicare assignment
- Medical or professional school
- University Of Massachusetts Medical School, 2018
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 119 Belmont St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Michael William Kalfopoulos in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 288033Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average internal medicine physician in 2024
285 Medicare Part D claims for 106 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Prednisone29 claims
- Furosemide16 claims
- Losartan Potassium11 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): 97 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: $39.75
1 payment: food and beverage; the largest payer was Current Health Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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
- Umass Memorial Medical Group IncWorcester, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael William Kalfopoulos among 6,825 internal medicine physician records in Massachusetts
Michael William Kalfopoulos, MD is one of 6,825 internal medicine physician records with a practice address in Massachusetts. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 82% of them.
- NPI issued2018 · 82% of these records are older, 16% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2018 · median 2004 among the 4,103 with a school on file
- Record last updated2022 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
448 internal medicine physician records list a practice address in Worcester
They are 448 of the 13,166 NPPES records with a practice address in Worcester, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Worcester → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Maria Casal, M.D.Worcester, MA 016051609859503
- Paula Cullinane, M.D.Worcester, MA 016051952384950
- Michael Galica, M.D.Worcester, MA 016051972586733
- Maria Garcia, M.D.Worcester, MA 016051396726220
- Mary Hawthorne, M.D.Worcester, MA 016051013990787
- Gayatridevi Ika, M.D.Worcester, MA 016051124001102
- Jayanthi Kumar, M.D.Worcester, MA 016051528041423
- Christine Macginnis, D.O.Worcester, MA 016051952382772
Common questions
What is Michael William Kalfopoulos, MD's NPI number?
Michael William Kalfopoulos, MD's National Provider Identifier (NPI) is 1235634320, issued on Mar 29, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Michael William Kalfopoulos, MD located?
The NPPES record lists a practice address at 119 Belmont St, Worcester, MA, 01605. Phone: (508) 334-8515. Providers update this record themselves, so call before visiting.
How can I verify Michael William Kalfopoulos, MD's license?
NPPES lists Massachusetts license number 288033, 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 Michael William Kalfopoulos, MD prescribe under Medicare Part D?
In 2024, Michael William Kalfopoulos, MD had 285 Medicare Part D claims for 106 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Michael William Kalfopoulos, MD's MIPS final score?
The 2023 MIPS final score is 97 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.