LARRY ADAM NATHANSON M.D.
NPI 1740220276
Emergency Medicine in Boston, MA
About Larry Adam Nathanson M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
LARRY ADAM NATHANSON M.D. (NPI 1740220276) is an individual emergency medicine provider in Boston, Massachusetts, licensed in Massachusetts (158840) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS, is affiliated with Umass Memorial Health - Harrington Hospital, and maintains a secondary practice location in Burlington.
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
Larry Adam Nathanson 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
7Medicare enrollment records show Larry Nathanson reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Boston, MA 02215
- Reassigned Medicare billing, Massachusetts enrollment
- Also billed through NPI 1952358533 (Massachusetts)
- 1,006 clinicians in this Medicare group
Boston, MA 02215
- Reassigned Medicare billing, Massachusetts enrollment
- 1,477 clinicians in this Medicare group
Boston, MA 02215
- Reassigned Medicare billing, Massachusetts enrollment
- Also billed through NPI 1316987993 (Massachusetts)
- 2,579 clinicians in this Medicare group
Cambridge, MA 02138
- Reassigned Medicare billing, Massachusetts enrollment
- 423 clinicians in this Medicare group
Milton, MA 02186
- Reassigned Medicare billing, Massachusetts enrollment
- 177 clinicians in this Medicare group
Burlington, MA 01805
- Reassigned Medicare billing, Massachusetts enrollment
- Also billed through NPI 1063447316 (Massachusetts)
- 1,574 clinicians in this Medicare group
Ayer, MA 01432
- Reassigned Medicare billing, Massachusetts enrollment
- 290 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 6
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 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Umass Memorial Health - Harrington Hospital
Acute Care Hospitals · Southbridge, MABeth Israel Deaconess Hospital - Needham
Acute Care Hospitals · Needham, MABeth Israel Deaconess Medical Center
Acute Care Hospitals · Boston, MALahey Hospital & Medical Center, Burlington
Acute Care Hospitals · Burlington, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02215 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 02215
BOSTON, MA 02215
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 Larry Nathanson's NPI number?
The NPI number for Larry Nathanson is 1740220276. It was assigned to this individual provider in the NPPES registry on June 6, 2006.
Where is Larry Nathanson located?
Larry Nathanson practices at 1 Deaconess Rd W/Cc2, Boston, MA 02215. The listed phone number is (617) 754-2389.
What is Larry Nathanson's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Larry Nathanson enrolled in Medicare?
Yes. Larry Nathanson 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 Larry Nathanson's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Larry Nathanson reassigns Medicare benefits to 7 organizations: Associated Physicians Of Harvard Medical Faculty Physicians At Beth Is (Boston, MA), Beth Israel Deaconess Medical Center, Inc. (Boston, MA), Harvard Medical Faculty Phys At Beth Israel Deaconess Med Ctr Inc (Boston, MA), Mount Auburn Professional Services Inc (Cambridge, MA), Bid-Milton Physician Associates Inc (Milton, MA) and 2 more organizations, listed in the Medicare section above. 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 Larry Nathanson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Larry Nathanson affiliated with any hospitals?
According to CMS data, Larry Nathanson is affiliated with Umass Memorial Health - Harrington Hospital, Beth Israel Deaconess Hospital - Needham, Beth Israel Deaconess Medical Center and Lahey Hospital & Medical Center, Burlington.
When was this NPI record last updated?
The NPPES record for Larry Nathanson was last updated on February 16, 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.
# Larry Adam Nathanson, M.D. · NPI 1740220276
Emergency Medicine physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since June 6, 2006.
## Identity
- **NPI:** 1740220276 (Entity type: Individual)
- **Enumerated:** June 6, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 158840 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 1 DEACONESS RD, W/CC2, Boston, MA 02215-5321
- **Phone:** (617) 754-2389
## 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:** 7 organizations under Medicare reassignment (form CMS-855R): Associated Physicians Of Harvard Medical Faculty Physicians At Beth Is (NPI 1861216038, Boston, MA); Beth Israel Deaconess Medical Center, Inc. (NPI 1548202641, Boston, MA); Harvard Medical Faculty Phys At Beth Israel Deaconess Med Ctr Inc (NPI 1194765438, Boston, MA); Mount Auburn Professional Services Inc (NPI 1992750996, Cambridge, MA); Bid-Milton Physician Associates Inc (NPI 1184312738, Milton, MA); and 2 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** State University Of Ny Upstate Medical University, class of 1996
## Record status
- **NPPES last updated:** February 16, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1740220276) · Data from the CMS NPPES public registry.