Mitchell Fenster, M.D.
Internal Medicine Physician · Valhalla, NY
Mitchell Fenster, M.D. is an internal medicine physician with a practice address in Valhalla, New York, and NPI 1548378573, issued on Aug 29, 2006. Check the license (New York 153600, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Mitchell Fenster
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 153600 NY
Self-reported in NPPES; status is on the state search - Practice location
- 401 Columbus Ave, Valhalla, NY 10595
- Phone
- (914) 769-0268
- Enumerated
- Aug 29, 2006
- Record last updated
- Sep 12, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (914) 769-6303
- Medicare enrollment
- Enrolled (PECOS I20090706000339); may accept Medicare assignment
- Medical or professional school
- Icahn School Of Medicine At Mount Sinai, 1981
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 12,067 in New York → Look up another NPI →
Also registered at 401 Columbus Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Carolyn Berardi, PTSpecialist1912132341
- Jane Gold, MDInternal Medicine Physician1033281340
- Lauren GonzalezPhysical Therapist1902174105
- Andrew LoweInternal Medicine Physician1164530143
- Rhonda Rubin, MDInternal Medicine Physician1265420426
- Steven Silverman, M.D.Gastroenterology Physician1003924077
Verify Mitchell Fenster in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 153600Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
85% more Medicare Part D claims than the average internal medicine physician in 2024
5,882 Medicare Part D claims for 540 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 37 claims were for opioids.
Most prescribed
- Atorvastatin Calcium527 claims
- Amlodipine Besylate371 claims
- Rosuvastatin Calcium266 claims
- Escitalopram Oxalate229 claims
- Lisinopril166 claims
- Metoprolol Succinate146 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 91.6 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through 2 group practices
- Select PT, OT And Slp Rehabilitation NY, PLLCHudson, NY
- Westchester Health Medical PCValhalla, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mitchell Fenster among 12,067 internal medicine physician records in New York
Mitchell Fenster, M.D. is one of 12,067 internal medicine physician records with a practice address in New York. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 53% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1981 · median 2002 among the 7,221 with a school on file
- Record last updated2012 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
68 internal medicine physician records list a practice address in Valhalla
They are 68 of the 2,105 NPPES records with a practice address in Valhalla, and 12,067 internal medicine physician records in New York.
All 12,067 in New York → Every provider in Valhalla → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Ronald Cho, MDValhalla, NY 105951457388977
- Rosemarie Conigliaro, MDValhalla, NY 105951538170717
- Melissa Gennarelli, M.D.Valhalla, NY 105951871557249
- Randy Goldberg, MDValhalla, NY 105951154329936
- Gary Guo, MDValhalla, NY 105951932129582
- Andrew Gutwein, MDValhalla, NY 105951801816483
- Wei-Nchih Lee, MDValhalla, NY 105951750301305
- Anne Beth Litt, M.D.Valhalla, NY 105951376574293
Common questions
What is Mitchell Fenster, M.D.'s NPI number?
Mitchell Fenster, M.D.'s National Provider Identifier (NPI) is 1548378573, issued on Aug 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mitchell Fenster, M.D. located?
The NPPES record lists a practice address at 401 Columbus Ave, Valhalla, NY, 10595. Phone: (914) 769-0268. Providers update this record themselves, so call before visiting.
How can I verify Mitchell Fenster, M.D.'s license?
NPPES lists New York license number 153600, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mitchell Fenster, M.D. prescribe under Medicare Part D?
In 2024, Mitchell Fenster, M.D. had 5,882 Medicare Part D claims for 540 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Mitchell Fenster, M.D.'s MIPS final score?
The 2023 MIPS final score is 91.6 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.