Mark Filstein, MD
NPI 1649396110 · Specialist · Brooklyn, NY
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Filstein, MD is a Specialist provider in Brooklyn, NY (NPI 1649396110).
Provider details
- NPI number
- 1649396110
- Entity type
- Individual
- Primary specialty
- SpecialistOther Service Providers
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 182093 (NY)
Specialties & taxonomies
Other Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
19 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
2 documented practice locations
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$383 across 9 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 161 Madison Ave Rm 4eNew York, NY 10016-5461Phone: (212) 481-4041Fax: (212) 481-1008
Registry dates
- Enumerated
- 2007-03-22
- Last updated
- 2025-10-30
- Certified
- 2025-10-30
Frequently asked questions
- What is Mark Filstein's NPI number?
- Mark Filstein's National Provider Identifier (NPI) is 1649396110, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Filstein's specialty?
- Mark Filstein is listed in the NPPES registry with a primary specialty of Specialist (Other Service Providers).
- Where is Mark Filstein located?
- Mark Filstein's practice location on file with NPPES is 2422 Knapp St, Brooklyn, NY 11235-1006.
- What is Mark Filstein's phone number?
- The practice phone number listed in the NPPES registry for Mark Filstein is (718) 934-6777.
- Does Mark Filstein accept Medicare?
- Mark Filstein is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Filstein's NPI active?
- Yes — Mark Filstein's NPI (1649396110) is active in the NPPES registry as of the last update on 2025-10-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.