Ali Duffens, MD
Internal Medicine Physician · New York, NY
Ali Duffens, MD is an internal medicine physician with a practice address in New York, New York, and NPI 1568049922, issued on Mar 24, 2021. Check the license (New York 336684, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Ali Duffens
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 336684 NY
Self-reported in NPPES; status is on the state search - Practice location
- 1275 York Ave, New York, NY 10065
- Phone
- (646) 905-0332
- Enumerated
- Mar 24, 2021
- Record last updated
- May 26, 2026
- Medicare enrollment
- Enrolled (PECOS I20250724003158); accepts Medicare assignment
- Medical or professional school
- Irvine California College Of Medicine, 2021
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 12,067 in New York → Look up another NPI →
Also registered at 1275 York Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Gina Abdulahad, PA-CPhysician Assistant1174027064
- Wassim Abida, MD, PHDHematology & Oncology Physician1518101096
- Lincy Abraham, NPPediatric Nurse Practitioner1295003739
Verify Ali Duffens 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 336684Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average internal medicine physician in 2024
138 Medicare Part D claims for 95 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of 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.
Bills Medicare through one group practice
- Msk BergenMontvale, NJ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ali Duffens among 12,067 internal medicine physician records in New York
Ali Duffens, MD 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 2021, is newer than 91% of them.
- NPI issued2021 · 91% of these records are older, 6% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2021 · median 2002 among the 7,221 with a school on file
- Record last updated2026 · 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).
2,434 internal medicine physician records list a practice address in New York
They are 2,434 of the 98,468 NPPES records with a practice address in New York, and 12,067 internal medicine physician records in New York.
All 12,067 in New York → Every provider in New York → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Paul Knoepflmacher, M.D.New York, NY 100651144291972
- Deborah Korenstein, MDNew York, NY 100651912925793
- Paul Miskovitz, M.D.New York, NY 100651699721126
- Sean Pickering, MDNew York, NY 100651790717130
Common questions
What is Ali Duffens, MD's NPI number?
Ali Duffens, MD's National Provider Identifier (NPI) is 1568049922, issued on Mar 24, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Ali Duffens, MD located?
The NPPES record lists a practice address at 1275 York Ave, New York, NY, 10065. Phone: (646) 905-0332. Providers update this record themselves, so call before visiting.
How can I verify Ali Duffens, MD's license?
NPPES lists New York license number 336684, 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 Ali Duffens, MD prescribe under Medicare Part D?
In 2024, Ali Duffens, MD had 138 Medicare Part D claims for 95 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
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.