DR. ANTONIA ELIZABETH STEPHEN MD
NPI 1386626679
Surgery in Boston, MA
About Dr. Antonia Elizabeth Stephen Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ANTONIA ELIZABETH STEPHEN MD (NPI 1386626679) is an individual surgery provider in Boston, Massachusetts, licensed in Massachusetts (160829) and active in the NPI registry since November 2005. She is enrolled in Medicare PECOS, is affiliated with Massachusetts General Hospital, and is a graduate of Harvard Medical School (1996).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 5
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
Dr. Antonia Elizabeth Stephen 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 Reassignments
2Medicare enrollment records show Antonia Stephen reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts enrollment
- 6,360 clinicians in this Medicare group
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts enrollment
- 6,234 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 7
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 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Massachusetts General Hospital
Acute Care Hospitals · Boston, MAMassachusetts Eye And Ear Infirmary -
Acute Care Hospitals · Boston, MANewton-Wellesley Hospital
Acute Care Hospitals · Newton, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02114 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 02114
BOSTON, MA 02114
BOSTON, MA 02114
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 Antonia Stephen's NPI number?
The NPI number for Antonia Stephen is 1386626679. It was assigned to this individual provider in the NPPES registry on November 14, 2005.
Where is Antonia Stephen located?
Antonia Stephen practices at 55 Fruit St Surgical Oncology Associates Yaw 7B, Boston, MA 02114. The listed phone number is (617) 726-0531.
What is Antonia Stephen's specialty?
The primary specialty registered for this NPI is Surgery with taxonomy code 208600000X.
Is Antonia Stephen enrolled in Medicare?
Yes. Antonia Stephen 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 organizations bill Medicare for Antonia Stephen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Antonia Stephen reassigns Medicare benefits to 2 organizations: Massachusetts General Physicians Organization Inc (Boston, MA) and The General Hospital Corporation (Boston, MA). Each 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 Antonia Stephen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Antonia Stephen affiliated with any hospitals?
According to CMS data, Antonia Stephen is affiliated with Massachusetts General Hospital, Massachusetts Eye And Ear Infirmary - and Newton-Wellesley Hospital.
When was this NPI record last updated?
The NPPES record for Antonia Stephen was last updated on July 30, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.
# Dr. Antonia Elizabeth Stephen, MD · NPI 1386626679
Surgery physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since November 14, 2005.
## Identity
- **NPI:** 1386626679 (Entity type: Individual)
- **Enumerated:** November 14, 2005
- **Primary specialty:** Surgery · taxonomy 208600000X
- **State license:** 160829 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 55 FRUIT ST, SURGICAL ONCOLOGY ASSOCIATES YAW 7B, Boston, MA 02114-2621
- **Phone:** (617) 726-0531 · **Fax:** (617) 724-3895
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Massachusetts General Physicians Organization Inc (NPI 1801874573, Boston, MA); The General Hospital Corporation (NPI 1023049236, Boston, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Harvard Medical School, class of 1996
## Record status
- **NPPES last updated:** July 30, 2012
- **Other identifiers:** Other J27326 (MA); Medicare UPIN H90807; Medicare ID-Type Unspecified A37115 (MA); and 2 more
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Source: [NPI Profile](https://npiprofile.com/npi/1386626679) · Data from the CMS NPPES public registry.