Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Ali Duffens, MD

Individual provider Internal Medicine Physician · NPI 1568049922

Ali Duffens, MD is an Internal Medicine in New York, New York. Graduated from Irvine California College of Medicine in 2021, 5 years ago. Practices with MSK Bergen, a 254-clinician group and accepts Medicare assignment. Licensed in New York.

Years since qualifying
5
Trained at
Irvine California College of Medicine
Licensed in
NY
In the registry since
2021
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1275 York Ave
New York, NY 10065-6007
Phone: (646) 905-0332
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 336684 (NY)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X

Record details

NPI number1568049922
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 24, 2021
Last updated in NPPESMay 26, 2026
Certification dateMay 26, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolIRVINE CALIFORNIA COLLEGE OF MEDICINE
Graduated 2021 (5 years in practice)
Group practice Msk Bergen — 254 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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