JOHN OSTROMINSKI
NPI 1740770155
Internal Medicine - Cardiovascular Disease in Boston, MA
About John Ostrominski NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JOHN OSTROMINSKI (NPI 1740770155) is an individual cardiovascular disease provider in Boston, Massachusetts, licensed in Massachusetts (291118) and active in the NPI registry since May 2018. He is enrolled in Medicare PECOS, is affiliated with Brigham And Women's Hospital, and is a graduate of University Of Texas Medical School At San Antonio (2018).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
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
John Ostrominski 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 John Ostrominski reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Boston, MA 02115
- Reassigned Medicare billing, Massachusetts enrollment
- 4,574 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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Brigham And Women's Hospital
Acute Care Hospitals · Boston, MAFaulkner Hospital-Brigham And Women's
Acute Care Hospitals · Boston, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02115 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
BOSTON, MA 02115
BOSTON, MA 02115
BOSTON, MA 02115
BOSTON, MA 02115
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 John Ostrominski's NPI number?
The NPI number for John Ostrominski is 1740770155. It was assigned to this individual provider in the NPPES registry on May 11, 2018.
Where is John Ostrominski located?
John Ostrominski practices at 75 Francis St, Boston, MA 02115. The listed phone number is (617) 732-5500.
What is John Ostrominski's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Cardiovascular Disease, with taxonomy code 207RC0000X.
Is John Ostrominski enrolled in Medicare?
Yes. John Ostrominski 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 John Ostrominski's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Ostrominski reassigns Medicare benefits to Brigham & Womens Physicians Organization Inc (Boston, 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 John Ostrominski's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does John Ostrominski accept?
Health plans from Anthem Blue Cross and Blue Shield list John Ostrominski as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is John Ostrominski affiliated with any hospitals?
According to CMS data, John Ostrominski is affiliated with Brigham And Women's Hospital and Faulkner Hospital-Brigham And Women's.
When was this NPI record last updated?
The NPPES record for John Ostrominski was last updated on June 1, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 months 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.
# John Ostrominski · NPI 1740770155
Cardiovascular Disease physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since May 11, 2018.
## Identity
- **NPI:** 1740770155 (Entity type: Individual)
- **Enumerated:** May 11, 2018
- **Primary specialty:** Internal Medicine - Cardiovascular Disease · taxonomy 207RC0000X
- **State license:** 291118 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 75 FRANCIS ST, Boston, MA 02115-6110
- **Phone:** (617) 732-5500
## 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:** Brigham & Womens Physicians Organization Inc (NPI 1033535497, Boston, MA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Texas Medical School At San Antonio, class of 2018
## Record status
- **NPPES last updated:** June 1, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1740770155) · Data from the CMS NPPES public registry.