Dr Zack John Williams, MD - Medicare Hospitalist in New Britain, CT

Dr Zack John Williams, MD is a medicare enrolled "Internal Medicine" physician in New Britain, Connecticut. He went to State University Of New York At Stony Brook, School Of Medicine and graduated in 2013 and has 11 years of diverse experience with area of expertise as Hospitalist. He is a member of the group practice Bristol Hospital Multi-specialty Group, Inc. and his current practice location is 100 Grand St, New Britain, Connecticut. You can reach out to his office (for appointments etc.) via phone at (860) 224-5661.

Dr Zack John Williams is licensed to practice in Connecticut (license number 55414) 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 1861831505.

Contact Information

Dr Zack John Williams, MD
100 Grand St,
New Britain, CT 06052-2016
(860) 224-5661
(860) 224-5785

Map and Direction




Physician's Profile

Full NameDr Zack John Williams
GenderMale
SpecialityHospitalist
Experience11 Years
Location100 Grand St, New Britain, 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:
  • Dr Zack John Williams attended and graduated from State University Of New York At Stony Brook, School Of Medicine in 2013
  NPI Data:
  • NPI Number: 1861831505
  • Provider Enumeration Date: 06/16/2013
  • Last Update Date: 12/20/2021
  Medicare PECOS Information:
  • PECOS PAC ID: 3476849803
  • Enrollment ID: I20160909002177

Medical Identifiers

Medical identifiers for Dr Zack John Williams such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1861831505NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine 55414 (Connecticut)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Bristol Hospital Home Care AgencyBristol, CTHospice
Bristol HospitalBristol, CTHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Bristol Hospital Multi-specialty Group, Inc.9032014758114

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 Zack John Williams allows following entities to bill medicare on his behalf.
Entity NameTrinity Health Of New England Provider Network Organization Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1003882812
PECOS PAC ID: 0941113567
Enrollment ID: O20031110000651
Entity NameBristol Hospital Multi-specialty Group, Inc.
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1649265679
PECOS PAC ID: 9032014758
Enrollment ID: O20031204000960
Entity NameThe Hospital Of Central Connecticut At New Britain General And Bradley
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1063461481
PECOS PAC ID: 6507776564
Enrollment ID: O20040115000497

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 Zack John Williams 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 Zack John Williams, MD
100 Grand St,
New Britain, CT 06052-2016

Ph: (860) 224-5661
Dr Zack John Williams, MD
100 Grand St,
New Britain, CT 06052-2016

Ph: (860) 224-5661

Reviews and Comments


Internal Medicine Doctors in New Britain, CT

Dr. Michael G. Genovesi, M.D.
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Phone: 860-224-6266    Fax: 860-224-6269
Brenda Nurse, M.D.
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Dr. Yousong Wang, M.D.
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Justin B Lundbye, M.D.
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Phone: 860-224-5731    Fax: 860-224-5749
Rekha Kumari, MD
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Phone: 860-224-5990    Fax: 860-972-7040
Dr. Manmeet Kaur, M.D.
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Practice Location: 100 Grand St, Joslin Diabetes Center, New Britain, CT 06052
Phone: 860-224-5672    
Dr. Ujwol Karmacharya, MD
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Medicare: Medicare Enrolled
Practice Location: 100 Grand Street, New Britain, CT 06052
Phone: 860-224-5011    

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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