DR. ARTHUR J SIEGEL MD
NPI 1881675601
Internal Medicine in Belmont, MA
About Dr. Arthur J Siegel Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ARTHUR J SIEGEL MD (NPI 1881675601) is an individual internal medicine provider in Belmont, Massachusetts, licensed in Massachusetts (30958) and active in the NPI registry since November 2005. He is enrolled in Medicare PECOS and is a graduate of Harvard Medical School (1967).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 5
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. Arthur J Siegel 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 Reassignment
Medicare enrollment records show Arthur Siegel reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts enrollment
- 6,360 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 02478 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.
BELMONT, MA 02478
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 Arthur Siegel's NPI number?
The NPI number for Arthur Siegel is 1881675601. It was assigned to this individual provider in the NPPES registry on November 9, 2005.
Where is Arthur Siegel located?
Arthur Siegel practices at 115 Mill St Mclean Hospital, Belmont, MA 02478. The listed phone number is (617) 855-2358.
What is Arthur Siegel's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Arthur Siegel enrolled in Medicare?
Yes. Arthur Siegel 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 organization bills Medicare for Arthur Siegel's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Arthur Siegel reassigns Medicare benefits to Massachusetts General Physicians Organization Inc (Boston, MA). The 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 Arthur Siegel's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Arthur Siegel accept?
Health plans from Taro Health list Arthur 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 Arthur Siegel was last updated on February 11, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.
# Dr. Arthur J Siegel, MD · NPI 1881675601
Internal Medicine physician in Belmont, Massachusetts. Individual provider, active in the CMS NPPES registry since November 9, 2005.
## Identity
- **NPI:** 1881675601 (Entity type: Individual)
- **Enumerated:** November 9, 2005
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 30958 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 115 MILL ST, MCLEAN HOSPITAL, Belmont, MA 02478-9106
- **Phone:** (617) 855-2358 · **Fax:** (617) 855-3731
## 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:** Massachusetts General Physicians Organization Inc (NPI 1801874573, Boston, MA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Harvard Medical School, class of 1967
## Record status
- **NPPES last updated:** February 11, 2014
- **Other identifiers:** Other L20009 (MA); Medicare PIN L20009 (MA); Medicaid 2029332 (MA); and 2 more
---
Source: [NPI Profile](https://npiprofile.com/npi/1881675601) · Data from the CMS NPPES public registry.