Mark Filstein Md PLLC in Brooklyn, NY
This organization bills under NPI 1679442511, an organization record issued on Oct 30, 2025 with the primary taxonomy Internal Medicine Physician. Each clinician who works there has their own NPI and license.
Organization recordNPPES, Aug 2026
1679442511
- Legal name
- Mark Filstein Md PLLC
- Entity
- Type 2 · organization
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- Practice location
- 2422 KNAPP ST, Brooklyn, NY 11235
- Phone
- 718-934-6777
- Enumerated
- Oct 30, 2025
- Record updated
- Oct 30, 2025
- Authorized official
- Director (title as filed)
2 clinicians CMS lists with Mark Filstein Md in Brooklyn
- Mark Filstein, MDSpecialist1649396110
- Elina KaganovskyInternal Medicine Physician1205867140
Source: CMS Doctors and Clinicians group affiliations, matched by practice name and city.
Checking an organization
- Confirm the business with the New York secretary of state.
- Check the HHS-OIG exclusion list for the organization.
- Verify each clinician on their own record and the state license search.
Common questions
Is an organization NPI a license?
No. An NPI identifies who bills. Facilities and the clinicians who work there are licensed separately by the state.
Source: CMS National Plan and Provider Enumeration System (NPPES), monthly file of Aug 9, 2026 (NPPES files on CMS.gov). An NPI identifies who bills; it is not a license.