Mark Fenster
- Part D claims, 2024
- 88
- Hospital affiliations
- 1
- Industry payments
- $118
- Medical groups
- 2
- State license
- 1
- Practice address
- 2601 Ocean Parkway, Brooklyn, NY 11235
- Practice phone
- Call (718) 616-4834
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Mark Fenster's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Mark Fenster is a pediatrician in Brooklyn, New York
Mark Fenster practices at NYC Health + Hospitals/South Brooklyn Health, Ruth Bader Ginsburg Hospital in Brooklyn, New York, part of NYC.
Mark Fenster's NPI, 1376566620, was assigned on July 26, 2006. Mark Fenster holds New York license 172975-1.
- NPI
- 1376566620NPI Registry (opens in a new tab)
- NPI enumeration date
- July 26, 2006
- NPI status
- Active
- Practice phone
- (718) 616-4834
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Mark Fenster practices at NYC Health + Hospitals/South Brooklyn Health, Ruth Bader Ginsburg Hospital in Brooklyn, New York
Mark Fenster's primary practice is NYC Health + Hospitals/South Brooklyn Health, Ruth Bader Ginsburg Hospital, at 2601 Ocean Parkway, Brooklyn, NY 11235 in Kings County. The practice phone is (718) 616-4834.
- NYC Health + Hospitals/South Brooklyn Health, Ruth Bader Ginsburg Hospital2601 Ocean Parkway, Brooklyn, NY 11235 · Kings CountyPhone(718) 616-4834
Source: Dmand AI Affiliation Data
Mark Fenster is affiliated with 1 site of care and 2 medical groups
Mark Fenster's primary practice is NYC Health + Hospitals/South Brooklyn Health, Ruth Bader Ginsburg Hospital in Brooklyn, New York, part of NYC. The medical group on file is Physician Affiliate Group of New York (PAGNY). Dmand AI also links Mark Fenster to 1 more medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Mark Fenster's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Mark Fenster practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| NYC Health + Hospitals/South Brooklyn Health, Ruth Bader Ginsburg Hospital | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Mark Fenster is one of 4,313 pediatricians in New York
Pediatrics is Mark Fenster's primary specialty in the NPI Registry, under taxonomy code 208000000X. Mark Fenster is licensed in New York.
Specialties and state licenses
- Pediatrics, New YorkPrimary
Pediatricians near Mark Fenster
Counts of pediatricians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Mark Fenster's patients have a median age of 8
Across all payers, Dmand AI patient panel data puts Mark Fenster's median patient age at 8, with 46% women.
Mark Fenster's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 8
Patient panel by sex, all payers
- Women46%
- Men53%
Source: Dmand AI Patient Panel Data
Mark Fenster wrote 88 Medicare Part D claims in 2024
In 2024, Mark Fenster wrote 88 Medicare Part D claims. 99% of them were for generic drugs. CMS names the drug for 29 of them, across 2 drugs with 11 or more claims each, at $179 in total drug cost. In 2023, CMS named 23 claims across 2 drugs.
Mark Fenster's Part D claims by kind of drug, 2024
- Generic87 claims99%
- Brand-name and other1 claims1%
Mark Fenster's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Mark Fenster's Part D claims, 2024
- Antibiotics13%11 of 88 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 232024: 2926%
Drugs named by CMS: 2 in 2024, 2 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
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Mark Fenster received $118 in industry payments from 2024 to 2025
CMS Open Payments shows 4 general payments to Mark Fenster from 2 drug and device companies from 2024 to 2025. Food and beverage make up the largest share, 100% of the total. QOL Medical, LLC paid the most, $91.
General payments to Mark Fenster by program year, 2024 to 2025
Companies that paid Mark Fenster the most, 2024 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Mark Fenster's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Mark Fenster
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Mark Fenster's NPI number?
Mark Fenster's NPI number is 1376566620. It was assigned on July 26, 2006, and it is active in the NPI Registry.
What does Mark Fenster specialize in?
Mark Fenster is a pediatrician in Brooklyn, New York. The primary specialty in the NPI Registry is Pediatrics Physician (taxonomy code 208000000X).
Where does Mark Fenster practice?
Mark Fenster practices at 2601 Ocean Parkway, Brooklyn, NY 11235. Mark Fenster's primary practice is NYC Health + Hospitals/South Brooklyn Health, Ruth Bader Ginsburg Hospital in Brooklyn, New York, part of NYC. Dmand AI also links Mark Fenster to 1 medical group.
What is Mark Fenster's office phone number?
The practice phone on file for Mark Fenster is (718) 616-4834.
What is Mark Fenster's medical license number?
Mark Fenster holds New York license 172975-1.
Which hospitals is Mark Fenster affiliated with?
Mark Fenster practices at NYC Health + Hospitals/South Brooklyn Health, Ruth Bader Ginsburg Hospital in Brooklyn, New York.
What medical group is Mark Fenster part of?
Mark Fenster is linked to Physician Affiliate Group of New York (PAGNY). Dmand AI links Mark Fenster to 1 more medical group.
What drugs does Mark Fenster prescribe most?
In 2024 Medicare Part D data, Mark Fenster's most prescribed drugs by claims were Clotrimazole and Hydrochlorothiazide.
Has Mark Fenster received payments from drug or device companies?
CMS Open Payments shows $118 in general payments to Mark Fenster from 2 companies from 2024 to 2025. The largest total came from QOL Medical, LLC.
How long has Mark Fenster been practicing?
Mark Fenster's NPI was assigned in 2006.
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