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

Jeffrey L Halaas, MD

Individual provider Internal Medicine Physician · NPI 1851346928

Jeffrey L Halaas, MD is a Hematology/Oncology in Brewster, New York. Qualified in 1996, 30 years ago. Practices with Optum Medical Care PC, a 1,018-clinician group, accepts Medicare assignment and offers telehealth. Licensed in New York.

Years since qualifying
30
Licensed in
NY
In the registry since
2006
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

185 Route 312
Brewster, NY 10509-2337
Phone: (845) 231-5600
Fax: (845) 231-5489
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hematology & Oncology Physician (primary) Taxonomy 207RH0003X · Licence 219677 (NY)
Internal Medicine Physician Taxonomy 207R00000X · Licence 219677 (NY)

Record details

NPI number1851346928
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 24, 2006
Last updated in NPPESNovember 17, 2016

Medicare enrollment

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

Medicare specialtyHEMATOLOGY/ONCOLOGY
Also practisesINTERNAL MEDICINE
Medical schoolOTHER
Graduated 1996 (30 years in practice)
Group practice Optum Medical Care Pc — 1018 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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