DR. LOREN DAVID WALENSKY MD PHD
NPI 1508896853
Pediatrics - Pediatric Hematology-Oncology in Boston, MA
About Dr. Loren David Walensky Md Phd NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. LOREN DAVID WALENSKY MD PHD (NPI 1508896853) is an individual pediatric hematology-oncology provider in Boston, Massachusetts, licensed in Massachusetts (204839) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS and maintains a secondary practice location in Boston.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Other Identifiers 7
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. Loren David Walensky Md Phd is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show Loren Walensky 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
- 1,358 clinicians in this Medicare group
Boston, MA 02215
- Reassigned Medicare billing, Massachusetts enrollment
- 1,026 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.
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
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 Loren Walensky's NPI number?
The NPI number for Loren Walensky is 1508896853. It was assigned to this individual provider in the NPPES registry on July 3, 2006.
Where is Loren Walensky located?
Loren Walensky practices at 300 Longwood Ave, Boston, MA 02115. The listed phone number is (617) 355-6000.
What is Loren Walensky's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Hematology-Oncology, with taxonomy code 2080P0207X.
Is Loren Walensky enrolled in Medicare?
Yes. Loren Walensky is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Loren Walensky's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Loren Walensky reassigns Medicare benefits to 2 organizations: Children's Hospital Pediatric Associates, Inc (Boston, MA) and Dana-Farber Cancer Institute, 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 Loren Walensky's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Loren Walensky accept?
Health plans from Anthem Blue Cross and Blue Shield and Taro Health list Loren Walensky 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.
When was this NPI record last updated?
The NPPES record for Loren Walensky was last updated on May 18, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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. Loren David Walensky, MD PHD · NPI 1508896853
Pediatric Hematology-Oncology physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since July 3, 2006.
## Identity
- **NPI:** 1508896853 (Entity type: Individual)
- **Enumerated:** July 3, 2006
- **Primary specialty:** Pediatrics - Pediatric Hematology-Oncology · taxonomy 2080P0207X
- **State license:** 204839 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 LONGWOOD AVE, Boston, MA 02115-5724
- **Phone:** (617) 355-6000
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **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): Children's Hospital Pediatric Associates, Inc (NPI 1457306664, Boston, MA); Dana-Farber Cancer Institute, Inc. (NPI 1851333686, Boston, MA) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** May 18, 2026
- **Other identifiers:** Other 7493680; Other 1160345; Medicaid 2000971 (MA); and 4 more
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Source: [NPI Profile](https://npiprofile.com/npi/1508896853) · Data from the CMS NPPES public registry.