DR. ERIC LY MD
NPI 1386222305
Anesthesiology - Pain Medicine in Boston, MA
About Dr. Eric Ly Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ERIC LY MD (NPI 1386222305) is an individual pain medicine provider in Boston, Massachusetts, licensed in Massachusetts (1022330) and active in the NPI registry since March 2021. He is enrolled in Medicare PECOS, is affiliated with Massachusetts General Hospital, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 2
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
Dr. Eric Ly 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
4Medicare enrollment records show Eric Ly reassigns Medicare billing to 4 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
Boston, MA 02111
- Reassigned Medicare billing, Massachusetts enrollment
- 246 clinicians in this Medicare group
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.
Massachusetts General Hospital
Acute Care Hospitals · Boston, MATufts Medical Center
Acute Care Hospitals · Boston, MAOther 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 Eric Ly's NPI number?
The NPI number for Eric Ly is 1386222305. It was assigned to this individual provider in the NPPES registry on March 31, 2021.
Where is Eric Ly located?
Eric Ly practices at 55 Fruit St, Boston, MA 02114. The listed phone number is (256) 783-1100.
What is Eric Ly's specialty?
The primary specialty registered for this NPI is Anesthesiology, specializing in Pain Medicine, with taxonomy code 207LP2900X.
Is Eric Ly enrolled in Medicare?
Yes. Eric Ly 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 Eric Ly's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Eric Ly reassigns Medicare benefits to 4 organizations: Massachusetts General Physicians Organization Inc (Boston, MA), The General Hospital Corporation (Boston, MA), Pratt Anesthesiology Associates, Inc (Boston, MA) and Brigham & Womens Physicians Organization Inc (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 Eric Ly's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Eric Ly accept?
Health plans from Taro Health list Eric Ly 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 Eric Ly affiliated with any hospitals?
According to CMS data, Eric Ly is affiliated with Massachusetts General Hospital and Tufts Medical Center.
When was this NPI record last updated?
The NPPES record for Eric Ly was last updated on February 26, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.
# Dr. Eric Ly, MD · NPI 1386222305
Pain Medicine physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since March 31, 2021.
## Identity
- **NPI:** 1386222305 (Entity type: Individual)
- **Enumerated:** March 31, 2021
- **Primary specialty:** Anesthesiology - Pain Medicine · taxonomy 207LP2900X
- **State license:** 1022330 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 55 FRUIT ST, Boston, MA 02114-2621
- **Phone:** (256) 783-1100
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Massachusetts General Physicians Organization Inc (NPI 1801874573, Boston, MA); The General Hospital Corporation (NPI 1023049236, Boston, MA); Pratt Anesthesiology Associates, Inc (NPI 1326085390, Boston, MA); Brigham & Womens Physicians Organization Inc (NPI 1033535497, Boston, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2021
## Record status
- **NPPES last updated:** February 26, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1386222305) · Data from the CMS NPPES public registry.