Alexander Hallac, MD
Hospitalist Physician · Greenwich, CT
Alexander Hallac, MD is a hospitalist physician with a practice address in Greenwich, Connecticut, and NPI 1386039998, issued on Mar 31, 2015. Check the license (Connecticut 64929, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Alexander Hallac
- Credential
- MD
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License numbers
- 64929 CT
278916 MA
Self-reported in NPPES; status is on the state search - Practice location
- 5 Perryridge RD, Greenwich, CT 06830
- Phone
- (203) 863-3151
- Enumerated
- Mar 31, 2015
- Record last updated
- Jul 24, 2024
- Medicare enrollment
- Enrolled (PECOS I20230227001641); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 400 in Connecticut → Look up another NPI →
Also registered at 5 Perryridge RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Saheeb AhmedStudent in an Organized Health Care Education/Training Program1326626748
- Rachel Alfandre, LCSWClinical Social Worker1497077259
- Vicki Altmeyer, M.D.Anatomic Pathology & Clinical Pathology Physician1700807898
Verify Alexander Hallac in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 64929Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through 2 group practices
- East Post Road Medical Services PCWhite Plains, NY
- Northeast Medical Group IncGreenwich, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Alexander Hallac among 400 hospitalist physician records in Connecticut
Alexander Hallac, MD is one of 400 hospitalist physician records with a practice address in Connecticut. 94% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 53% of them.
- NPI issued2015 · 53% of these records are older, 43% newer
- In a Medicare fileYes · 94% of these records are
- In the CMS Doctors and Clinicians fileYes · 83% of these records are
- Graduated2015 · median 2011 among the 332 with a school on file
- Record last updated2024 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospitalist Physician providers in Connecticut
There are 400 hospitalist physician records in Connecticut.
All 400 in Connecticut → Every provider in Greenwich → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Eleanore Black, M.D.Greenwich, CT 068301255863866
- Maxwell Bressman, M.D.Greenwich, CT 068301578094876
- Eunna Cho, DOGreenwich, CT 068301417485277
- Tracy-Ann Clarke-Leconte, M.D.Greenwich, CT 068301730157694
- Ryan KellyGreenwich, CT 068301962088427
- Valeria Pazo, M.D.,Greenwich, CT 068301154648467
- Nicholas Ragovis, M.D.Greenwich, CT 068301083770770
- Sabitha Rajan, M.D.Greenwich, CT 068301043323207
Common questions
What is Alexander Hallac, MD's NPI number?
Alexander Hallac, MD's National Provider Identifier (NPI) is 1386039998, issued on Mar 31, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Alexander Hallac, MD located?
The NPPES record lists a practice address at 5 Perryridge RD, Greenwich, CT, 06830. Phone: (203) 863-3151. Providers update this record themselves, so call before visiting.
How can I verify Alexander Hallac, MD's license?
NPPES lists Connecticut license number 64929, as entered by the provider. Search the Connecticut Medical Examining Board at https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
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.