ARIEL SIEGEL
NPI 1588227326
Internal Medicine - Hematology in Boston, MA
About Ariel Siegel NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ARIEL SIEGEL (NPI 1588227326) is an individual hematology provider in Boston, Massachusetts, licensed in Massachusetts (1026536) and active in the NPI registry since April 2019. She is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses 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 (PECOS)
Ariel Siegel is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show Ariel Siegel 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
Boynton Beach, FL 33426
- Reassigned Medicare billing, New York enrollment
- 7,712 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.
Physician 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.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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 Ariel Siegel's NPI number?
The NPI number for Ariel Siegel is 1588227326. It was assigned to this individual provider in the NPPES registry on April 17, 2019.
Where is Ariel Siegel located?
Ariel Siegel practices at 450 Brookline Ave, Boston, MA 02215. The listed phone number is (617) 632-2832.
What is Ariel Siegel's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology, with taxonomy code 207RH0000X.
Is Ariel Siegel enrolled in Medicare?
Yes. Ariel Siegel is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Ariel Siegel's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ariel Siegel reassigns Medicare benefits to 2 organizations: Dana-Farber Cancer Institute, Inc. (Boston, MA) and New York University (Boynton Beach, FL). 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 Ariel Siegel's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Ariel Siegel accept?
Health plans from Anthem Blue Cross and Blue Shield list Ariel Siegel 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 Ariel Siegel was last updated on July 20, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Ariel Siegel · NPI 1588227326
Hematology physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since April 17, 2019.
## Identity
- **NPI:** 1588227326 (Entity type: Individual)
- **Enumerated:** April 17, 2019
- **Primary specialty:** Internal Medicine - Hematology · taxonomy 207RH0000X
- **State license:** 1026536 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 450 BROOKLINE AVE, Boston, MA 02215-5450
- **Phone:** (617) 632-2832
## 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); New York University (NPI 1285826438, Boynton Beach, FL) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** July 20, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1588227326) · Data from the CMS NPPES public registry.