Aaron Westreich, MD - Medicare Allergy & Immunology in Valley Stream, NY

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Aaron Westreich, MD is a medicare enrolled "Allergy & Immunology" physician in Valley Stream, New York. His current practice location is 70 E Sunrise Hwy Ste 411, Valley Stream, New York. You can reach out to his office (for appointments etc.) via phone at (516) 355-0505.

Aaron Westreich is licensed to practice in New York (license number 315428) and he also participates in the medicare program. He does not accept medicare assignments directly but he may accept medicare through third-party (refer to Reassignment section below) and may also prescribe medicare part D drugs. His NPI Number is 1801329735.

Contact Information

Aaron Westreich, MD
70 E Sunrise Hwy Ste 411,
Valley Stream, NY 11581-1233
(516) 355-0505
(516) 355-2055

Map and Direction




Physician's Profile

Full NameAaron Westreich
GenderMale
SpecialityAllergy & Immunology
Location70 E Sunrise Hwy Ste 411, Valley Stream, New York
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1801329735
  • Provider Enumeration Date: 04/07/2017
  • Last Update Date: 06/23/2025
  Medicare PECOS Information:
  • PECOS PAC ID: 1052658283
  • Enrollment ID: I20220914002959

Medical Identifiers

Medical identifiers for Aaron Westreich such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1801329735NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207K00000XAllergy & Immunology 315428 (New York)Primary
208000000XPediatrics DR.0063992 (Colorado)Secondary

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. Aaron Westreich allows following entities to bill medicare on his behalf.
Entity NameEnt And Allergy Associates Llp
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1376598326
PECOS PAC ID: 0749193662
Enrollment ID: O20031107000043

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. Aaron Westreich 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
Aaron Westreich, MD
660 White Plains Rd Ste 400,
Tarrytown, NY 10591-5107

Ph: (914) 984-2546		Aaron Westreich, MD
70 E Sunrise Hwy Ste 411,
Valley Stream, NY 11581-1233

Ph: (516) 355-0505

Reviews and Comments


Allergy & Immunology Doctors in Valley Stream, NY

Susanne Labarba, D.O.
Allergy & Immunology
Medicare: Accepting Medicare Assignments
Practice Location: 65 Roosevelt Ave, Valley Stream, NY 11581
Phone: 516-622-3490    
Dr. Morris Charytan, M.D.
Allergy & Immunology
Medicare: Medicare Enrolled
Practice Location: 20 Addison Pl, Valley Stream, NY 11580
Phone: 516-825-5599    Fax: 516-825-8317
Dr. Alan Siedlecki,
Allergy & Immunology
Medicare: Not Enrolled in Medicare
Practice Location: 779 Golf Dr, Valley Stream, NY 11581
Phone: 516-791-0145    

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.