MARK FILSTEIN MD PLLC
NPI 1679442511
Internal Medicine in Brooklyn, NY
About Mark Filstein Md Pllc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARK FILSTEIN MD PLLC (NPI 1679442511) is a healthcare organization registered as an internal medicine in Brooklyn, New York and active in the NPI registry since October 2025. The organization lists Mark Filstein, Director, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Mark Filstein Md Pllc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
2Medicare enrollment records show 2 clinicians reassign Medicare billing to Mark Filstein MD PLLC, which bills Medicare for the services they deliver. Of these, 1 practice at this address and 2 within 10 miles. They are listed nearest first.
Clinicians, nearest first (2)
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
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 Mark Filstein MD PLLC's NPI number?
The NPI number for Mark Filstein MD PLLC is 1679442511. It was assigned to this organization in the NPPES registry on October 30, 2025.
Where is Mark Filstein MD PLLC located?
Mark Filstein MD PLLC is located at 2422 Knapp St, Brooklyn, NY 11235. The listed phone number is (718) 934-6777.
What is Mark Filstein MD PLLC's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Mark Filstein MD PLLC enrolled in Medicare?
Yes. Mark Filstein MD PLLC is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Mark Filstein MD PLLC?
According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians, all in Internal Medicine, reassign their Medicare billing to Mark Filstein MD PLLC. A 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 the clinician's services. Of these, 1 practice at this address and 2 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
When was this NPI record last updated?
The NPPES record for Mark Filstein MD PLLC was last updated on October 30, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.
# Mark Filstein Md Pllc · NPI 1679442511
Internal Medicine organization in Brooklyn, New York. Organization record, active in the CMS NPPES registry since October 30, 2025.
## Identity
- **NPI:** 1679442511 (Entity type: Organization)
- **Enumerated:** October 30, 2025
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **Organization subpart:** No
- **Authorized official:** Mark Filstein, DIRECTOR
## Practice location
- **Address:** 2422 KNAPP ST, Brooklyn, NY 11235-1006
- **Phone:** (718) 934-6777
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 2 clinicians (Internal Medicine) reassign Medicare billing to this organization (form CMS-855R); 1 practice at this address and 2 within 10 miles · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** October 30, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1679442511) · Data from the CMS NPPES public registry.