DR. CARY NATHANIEL WEISS MD
NPI 1407482383
Pediatrics - Pediatric Hematology-Oncology in Boston, MA
About Dr. Cary Nathaniel Weiss Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. CARY NATHANIEL WEISS MD (NPI 1407482383) is an individual pediatric hematology-oncology provider in Boston, Massachusetts, licensed in Massachusetts (1015292) and active in the NPI registry since March 2020. He is enrolled in Medicare PECOS, maintains a secondary practice location in Boston, and is a graduate of Other (2020).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
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. Cary Nathaniel Weiss Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show Cary Weiss reassigns Medicare billing to 2 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 1346433257 (Massachusetts)
- 1,026 clinicians in this Medicare group
Boston, MA 02115
- Reassigned Medicare billing, Massachusetts enrollment
- 1,358 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 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 Cary Weiss's NPI number?
The NPI number for Cary Weiss is 1407482383. It was assigned to this individual provider in the NPPES registry on March 23, 2020.
Where is Cary Weiss located?
Cary Weiss practices at 450 Brookline Ave, Boston, MA 02215. The listed phone number is (617) 632-3000.
What is Cary Weiss's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Hematology-Oncology, with taxonomy code 2080P0207X.
Is Cary Weiss enrolled in Medicare?
Yes. Cary Weiss is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Cary Weiss's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Cary Weiss reassigns Medicare benefits to 2 organizations: Dana-Farber Cancer Institute, Inc. (Boston, MA) and Children's Hospital Pediatric Associates, 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 Cary Weiss's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Cary Weiss accept?
Health plans from Anthem Blue Cross and Blue Shield and Taro Health list Cary Weiss 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 Cary Weiss was last updated on April 27, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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. Cary Nathaniel Weiss, MD · NPI 1407482383
Pediatric Hematology-Oncology physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since March 23, 2020.
## Identity
- **NPI:** 1407482383 (Entity type: Individual)
- **Enumerated:** March 23, 2020
- **Primary specialty:** Pediatrics - Pediatric Hematology-Oncology · taxonomy 2080P0207X
- **State license:** 1015292 (Massachusetts)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 450 BROOKLINE AVE, Boston, MA 02215-5418
- **Phone:** (617) 632-3000
## 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): Dana-Farber Cancer Institute, Inc. (NPI 1851333686, Boston, MA); Children's Hospital Pediatric Associates, Inc (NPI 1457306664, Boston, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2020
## Record status
- **NPPES last updated:** April 27, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1407482383) · Data from the CMS NPPES public registry.