REGAN H MARSH M.D.
NPI 1740215730
Emergency Medicine in Boston, MA
About Regan H Marsh M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
REGAN H MARSH M.D. (NPI 1740215730) is an individual emergency medicine provider in Boston, Massachusetts, licensed in Massachusetts (230033) and active in the NPI registry since July 2006. She is enrolled in Medicare PECOS, is affiliated with Brigham And Women's Hospital, and maintains a secondary practice location in Fort Defiance.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
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
Regan H Marsh M.d. 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 Regan Marsh reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Boston, MA 02115
- Reassigned Medicare billing, Massachusetts enrollment
- 4,574 clinicians in this Medicare group
Fort Defiance, AZ 86504
- Reassigned Medicare billing, Texas enrollment
- 518 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 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
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 Regan Marsh's NPI number?
The NPI number for Regan Marsh is 1740215730. It was assigned to this individual provider in the NPPES registry on July 11, 2006.
Where is Regan Marsh located?
Regan Marsh practices at Brigham And Women's Hospital 75 Francis St/Emergency Medicine, Boston, MA 02115. The listed phone number is (617) 732-8070.
What is Regan Marsh's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Regan Marsh enrolled in Medicare?
Yes. Regan Marsh 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 Regan Marsh's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Regan Marsh reassigns Medicare benefits to 2 organizations: Brigham & Womens Physicians Organization Inc (Boston, MA) and The Fort Defiance Indian Hospital Board, Incorporation (Fort Defiance, AZ). 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 Regan Marsh's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Regan Marsh affiliated with any hospitals?
According to CMS data, Regan Marsh 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 Regan Marsh was last updated on March 14, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.
# Regan H Marsh, M.D. · NPI 1740215730
Emergency Medicine physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since July 11, 2006.
## Identity
- **NPI:** 1740215730 (Entity type: Individual)
- **Enumerated:** July 11, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 230033 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** BRIGHAM AND WOMEN'S HOSPITAL, 75 FRANCIS ST/EMERGENCY MEDICINE, Boston, MA 02115
- **Phone:** (617) 732-8070
## 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): Brigham & Womens Physicians Organization Inc (NPI 1033535497, Boston, MA); The Fort Defiance Indian Hospital Board, Incorporation (NPI 1477876639, Fort Defiance, AZ) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Perelman School Of Med At The University Of Pennsylvania, class of 2004
## Record status
- **NPPES last updated:** March 14, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1740215730) · Data from the CMS NPPES public registry.