Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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Alexander Hallac, MD

Individual provider Hospitalist Physician · NPI 1386039998

Alexander Hallac, MD practises Internal Medicine in Greenwich, Connecticut. Qualified in 2015, 11 years ago. Practices with East Post Road Medical Services PC, a 415-clinician group and accepts Medicare assignment. Licensed in Connecticut and Massachusetts.

Years since qualifying
11
Licensed in
CT, MA
In the registry since
2015
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

5 Perryridge Rd
Greenwich, CT 06830-4697
Phone: (203) 863-3151
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hospitalist Physician (primary) Taxonomy 208M00000X · Licence 64929 (CT)
Hospitalist Physician Taxonomy 208M00000X · Licence 278916 (MA)

Record details

NPI number1386039998
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedMarch 31, 2015
Last updated in NPPESJuly 24, 2024
Certification dateJuly 24, 2024

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2015 (11 years in practice)
Group practice East Post Road Medical Services Pc — 415 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients393
Services billed 407 a service is one billed item, such as a visit, a test or a procedure
Average patient age80

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at East Post Road Medical Services PC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 415 clinicians in the practice; 12 are shown here.

Other providers in Greenwich