Gregory J Castiglia, MD - Medicare Neurosurgery in Williamsville, NY

Gregory J Castiglia, MD is a medicare enrolled "Neurological Surgery" physician in Williamsville, New York. He went to Columbia University College Of Physicians And Surgeons and graduated in 1992 and has 32 years of diverse experience with area of expertise as Neurosurgery. He is a member of the group practice University At Buffalo Neurosurgery Inc and his current practice location is 40 George Karl Blvd, Williamsville, New York. You can reach out to his office (for appointments etc.) via phone at (716) 218-1000.

Gregory J Castiglia is licensed to practice in New York (license number 1982201) 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 1003891896.

Contact Information

Gregory J Castiglia, MD
40 George Karl Blvd,
Williamsville, NY 14221-7183
(716) 218-1000
(716) 200-1857

Map and Direction




Physician's Profile

Full NameGregory J Castiglia
GenderMale
SpecialityNeurosurgery
Experience32 Years
Location40 George Karl Blvd, Williamsville, 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:
  • Gregory J Castiglia attended and graduated from Columbia University College Of Physicians And Surgeons in 1992
  NPI Data:
  • NPI Number: 1003891896
  • Provider Enumeration Date: 12/14/2005
  • Last Update Date: 10/15/2019
  Medicare PECOS Information:
  • PECOS PAC ID: 4486703535
  • Enrollment ID: I20101220000190

Medical Identifiers

Medical identifiers for Gregory J Castiglia such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1003891896NPI-NPPES
000525616001OtherNYBLUE CROSS/BLUE SHIELD
01934587MedicaidNY
0610627OtherNYINDEPENDENT HEALTH
140006487OtherRAILROAD MEDICARE
00020521001OtherNYUNIVERA HEALTHCARE

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207T00000XNeurological Surgery 1982201 (New York)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Sisters Of Charity HospitalBuffalo, NYHospital
Mercy Hospital Of BuffaloBuffalo, NYHospital
Erie County Medical CenterBuffalo, NYHospital
Mount St. Mary's Hospital & Health CenterLewiston, NYHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
University At Buffalo Neurosurgery Inc014312471961

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. Gregory J Castiglia allows following entities to bill medicare on his behalf.
Entity NameUniversity At Buffalo Neurosurgery Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1306896220
PECOS PAC ID: 0143124719
Enrollment ID: O20031125000264
Entity NameErie County Medical Center Corporation
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1528233616
PECOS PAC ID: 1456308907
Enrollment ID: O20050715000538

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. Gregory J Castiglia 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
Gregory J Castiglia, MD
40 George Karl Blvd,
Williamsville, NY 14221-7183

Ph: (716) 218-1000
Gregory J Castiglia, MD
40 George Karl Blvd,
Williamsville, NY 14221-7183

Ph: (716) 218-1000

Reviews and Comments


Neurological Surgery Doctors in Williamsville, NY

Dr. Ismet Hallac, M.D.
Neurological Surgery
Medicare: Medicare Enrolled
Practice Location: 5445 Transit Rd, Williamsville, NY 14221
Phone: 716-688-7349    
Dr. Gregory John Bennett, MD
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Medicare: Medicare Enrolled
Practice Location: 18 Limestone Dr, Suite 2, Williamsville, NY 14221
Phone: 716-932-7170    Fax: 716-932-7173
Dr. Elad I Levy, MD
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Medicare: Accepting Medicare Assignments
Practice Location: 40 George Karl Blvd, Williamsville, NY 14221
Phone: 716-218-1000    Fax: 716-200-1857
Dr. Michael Kenneth Landi, MD
Neurological Surgery
Medicare: Accepting Medicare Assignments
Practice Location: 400 International Dr., Williamsville, NY 14221
Phone: 716-631-3555    Fax: 716-631-9525
Dr. Jeffrey Paul Mullin, M.D.
Neurological Surgery
Medicare: Accepting Medicare Assignments
Practice Location: 40 George Karl Blvd, Williamsville, NY 14221
Phone: 716-218-1000    Fax: 716-200-1857
Dr. Adnan H Siddiqui, MD, PHD
Neurological Surgery
Medicare: Accepting Medicare Assignments
Practice Location: 40 George Karl Blvd, Williamsville, NY 14221
Phone: 716-218-1000    

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.

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