MR. MICHAEL WILLIAM KALFOPOULOS MD
NPI 1235634320
Internal Medicine in Worcester, MA
About Mr. Michael William Kalfopoulos Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MR. MICHAEL WILLIAM KALFOPOULOS MD (NPI 1235634320) is an individual internal medicine provider in Worcester, Massachusetts, licensed in Massachusetts (288033) and active in the NPI registry since March 2018. He is enrolled in Medicare PECOS, is affiliated with Umass Memorial Medical Center/university Campus, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Mr. Michael William Kalfopoulos Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Michael Kalfopoulos reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Worcester, MA 01655
- Reassigned Medicare billing, Massachusetts enrollment
- 2,902 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 2
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Umass Memorial Medical Center/University Campus
Acute Care Hospitals · Worcester, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 01605 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WORCESTER, MA 01605
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Michael Kalfopoulos's NPI number?
The NPI number for Michael Kalfopoulos is 1235634320. It was assigned to this individual provider in the NPPES registry on March 29, 2018.
Where is Michael Kalfopoulos located?
Michael Kalfopoulos practices at 119 Belmont St, Worcester, MA 01605. The listed phone number is (508) 334-8515.
What is Michael Kalfopoulos's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Michael Kalfopoulos enrolled in Medicare?
Yes. Michael Kalfopoulos is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Michael Kalfopoulos's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Michael Kalfopoulos reassigns Medicare benefits to Umass Memorial Medical Group Inc (Worcester, MA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Michael Kalfopoulos's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Michael Kalfopoulos affiliated with any hospitals?
According to CMS data, Michael Kalfopoulos is affiliated with Umass Memorial Medical Center/University Campus.
When was this NPI record last updated?
The NPPES record for Michael Kalfopoulos was last updated on September 2, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Mr. Michael William Kalfopoulos, MD · NPI 1235634320
Internal Medicine physician in Worcester, Massachusetts. Individual provider, active in the CMS NPPES registry since March 29, 2018.
## Identity
- **NPI:** 1235634320 (Entity type: Individual)
- **Enumerated:** March 29, 2018
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 288033 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 119 BELMONT ST, Worcester, MA 01605-2903
- **Phone:** (508) 334-8515 · **Fax:** (508) 334-6490
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Umass Memorial Medical Group Inc (NPI 1760445373, Worcester, MA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Massachusetts Medical School, class of 2018
## Record status
- **NPPES last updated:** September 2, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1235634320) · Data from the CMS NPPES public registry.