Dr Alexander John Greenstein, MD - Medicare General Surgery in New York, NY

Dr Alexander John Greenstein, MD is a medicare enrolled "Surgery" physician in New York, New York. He went to Js Weill Medical College, Cornell University and graduated in 2003 and has 21 years of diverse experience with area of expertise as General Surgery. He is a member of the group practice Icahn School Of Medicine At Mount Sinai and his current practice location is 5 E 98th St, 15th Floor, Box 1259, New York, New York. You can reach out to his office (for appointments etc.) via phone at (212) 241-8679.

Dr Alexander John Greenstein is licensed to practice in New York (license number 60 233708) 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 1992964035.

Contact Information

Dr Alexander John Greenstein, MD
5 E 98th St, 15th Floor, Box 1259,
New York, NY 10029-6501
(212) 241-8679
(212) 534-2654

Map and Direction




Physician's Profile

Full NameDr Alexander John Greenstein
GenderMale
SpecialityGeneral Surgery
Experience21 Years
Location5 E 98th St, New York, New York
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:
  • Dr Alexander John Greenstein attended and graduated from Js Weill Medical College, Cornell University in 2003
  NPI Data:
  • NPI Number: 1992964035
  • Provider Enumeration Date: 06/04/2008
  • Last Update Date: 10/08/2014
  Medicare PECOS Information:
  • PECOS PAC ID: 0648321356
  • Enrollment ID: I20100907001013

Medical Identifiers

Medical identifiers for Dr Alexander John Greenstein such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1992964035NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
208600000XSurgery 60 233708 (New York)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Mount Sinai HospitalNew york, NYHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Icahn School Of Medicine At Mount Sinai22646910702323

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. Dr Alexander John Greenstein allows following entities to bill medicare on his behalf.
Entity NameIcahn School Of Medicine At Mount Sinai
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1609120674
PECOS PAC ID: 8224282926
Enrollment ID: O20130205000439
Entity NameIcahn School Of Medicine At Mount Sinai
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1770823551
PECOS PAC ID: 2264691070
Enrollment ID: O20131220001018

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. Dr Alexander John Greenstein 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
Dr Alexander John Greenstein, MD
5 E 98th St, 15th Floor, Box 1259,
New York, NY 10029-6501

Ph: (212) 241-8679
Dr Alexander John Greenstein, MD
5 E 98th St, 15th Floor, Box 1259,
New York, NY 10029-6501

Ph: (212) 241-8679

Reviews and Comments


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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).

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