Alexander Hallac, MD - Medicare Hospitalist in Greenwich, CT

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Alexander Hallac, MD is a medicare enrolled "Hospitalist" physician in Greenwich, Connecticut. He graduated from medical school in 2015 and has 9 years of diverse experience with area of expertise as Hospitalist. He is a member of the group practice Lahey Clinic Inc, East Post Road Medical Services Pc and his current practice location is 5 Perryridge Rd, Greenwich, Connecticut. You can reach out to his office (for appointments etc.) via phone at (203) 863-3151.

Alexander Hallac is licensed to practice in Connecticut (license number 64929) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1386039998.

Contact Information

Alexander Hallac, MD
5 Perryridge Rd,
Greenwich, CT 06830-4697
(203) 863-3151
Not Available

Map and Direction




Physician's Profile

Full NameAlexander Hallac
GenderMale
SpecialityHospitalist
Experience9 Years
Location5 Perryridge Rd, Greenwich, Connecticut
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Alexander Hallac graduated from medical school in 2015
  NPI Data:
  • NPI Number: 1386039998
  • Provider Enumeration Date: 03/31/2015
  • Last Update Date: 07/24/2024
  Medicare PECOS Information:
  • PECOS PAC ID: 9830490010
  • Enrollment ID: I20191003003577

Medical Identifiers

Medical identifiers for Alexander Hallac such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1386039998NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
208M00000XHospitalist 278916 (Massachusetts)Secondary
208M00000XHospitalist 64929 (Connecticut)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
White Plains Hospital CenterWhite plains, NYHospital
Lahey Hospital & Medical Center, BurlingtonBurlington, MAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Lahey Clinic Inc22643365281200
East Post Road Medical Services Pc6406198506292

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Alexander Hallac allows following entities to bill medicare on his behalf.
Entity NameLahey Clinic Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1538194980
PECOS PAC ID: 2264336528
Enrollment ID: O20031120000097
Entity NameLahey Clinic Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1063447316
PECOS PAC ID: 2264336528
Enrollment ID: O20040629001269
Entity NameEmerson Practice Associates, Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1508020199
PECOS PAC ID: 8123188117
Enrollment ID: O20081120000518

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Alexander Hallac is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Alexander Hallac, MD
5 Perryridge Rd,
Greenwich, CT 06830-4697

Ph: (781) 744-3839		Alexander Hallac, MD
5 Perryridge Rd,
Greenwich, CT 06830-4697

Ph: (203) 863-3151

Reviews and Comments


Hospitalist Doctors in Greenwich, CT

Dr. Sabitha Rajan, M.D.
Hospitalist
Medicare: Not Enrolled in Medicare
Practice Location: 5 Perryridge Rd, Greenwich, CT 06830
Phone: 203-863-3685    Fax: 203-863-4738
Dr. Lori H. Pai, M.D.
Hospitalist
Medicare: Accepting Medicare Assignments
Practice Location: 5 Perryridge Rd, Greenwich, CT 06830
Phone: 203-863-3851    Fax: 203-863-4738
Dr. Tushaar Vishal Shrimanker, MD, MRCP(LON)
Hospitalist
Medicare: Medicare Enrolled
Practice Location: 5 Perryridge Rd, Greenwich, CT 06830
Phone: 203-863-3409    
Maxwell Bressman, M.D.
Hospitalist
Medicare: May Accept Medicare Assignments
Practice Location: 5 Perryridge Rd, Greenwich, CT 06830
Phone: 038-633-9722    Fax: 203-863-4647
Nayra A. Labrecque, PA-C
Hospitalist
Medicare: Accepting Medicare Assignments
Practice Location: 5 Perryridge Rd, Greenwich, CT 06830
Phone: 203-863-3972    Fax: 203-863-4647
Ryan Lamont Kelly,
Hospitalist
Medicare: Medicare Enrolled
Practice Location: 5 Perryridge Rd, Greenwich, CT 06830
Phone: 203-863-3409    Fax: 203-863-3446

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.