Dr William Timothy Lester, MD - Medicare Internal Medicine in Boston, MA

Dr William Timothy Lester, MD is a medicare enrolled "Internal Medicine" physician in Boston, Massachusetts. He went to University Of Texas Medical School At Houston and graduated in 1997 and has 27 years of diverse experience with area of expertise as Internal Medicine. He is a member of the group practice The General Hospital Corporation and his current practice location is 15 Parkman St, Wacc 6th Floor Internal Medicine Associates, Boston, Massachusetts. You can reach out to his office (for appointments etc.) via phone at (617) 726-2707.

Dr William Timothy Lester is licensed to practice in Massachusetts (license number 203104) 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 1316920184.

Contact Information

Dr William Timothy Lester, MD
15 Parkman St, Wacc 6th Floor Internal Medicine Associates,
Boston, MA 02114-3117
(617) 726-2707
(617) 724-2814

Map and Direction




Physician's Profile

Full NameDr William Timothy Lester
GenderMale
SpecialityInternal Medicine
Experience27 Years
Location15 Parkman St, Boston, Massachusetts
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 William Timothy Lester attended and graduated from University Of Texas Medical School At Houston in 1997
  NPI Data:
  • NPI Number: 1316920184
  • Provider Enumeration Date: 11/25/2005
  • Last Update Date: 04/01/2011
  Medicare PECOS Information:
  • PECOS PAC ID: 2668550658
  • Enrollment ID: I20080416000185

Medical Identifiers

Medical identifiers for Dr William Timothy Lester such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1316920184NPI-NPPES
0122963MedicaidMA
203104OtherMATUFTS HEALTH PLAN
J22764OtherMABCBS MA

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine 203104 (Massachusetts)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Partners Healthcare At Home - Home CareWaltham, MAHome health agency
Massachusetts General HospitalBoston, MAHospital
Brigham And Women's HospitalBoston, MAHospital
Newton-wellesley HospitalNewton, MAHospital
North Shore Medical Center -Salem, MAHospital
Massachusetts Eye And Ear Infirmary -Boston, MAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
The General Hospital Corporation65078038061058

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 William Timothy Lester allows following entities to bill medicare on his behalf.
Entity NameMassachusetts General Physicians Organization Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1801874573
PECOS PAC ID: 2466365820
Enrollment ID: O20031111000434
Entity NameThe General Hospital Corporation
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1023049236
PECOS PAC ID: 6507803806
Enrollment ID: O20080313000351

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 William Timothy Lester 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 William Timothy Lester, MD
Po Box 9142, Mass General Physician Organization,
Charlestown, MA 02129-9142

Ph: (617) 724-0287
Dr William Timothy Lester, MD
15 Parkman St, Wacc 6th Floor Internal Medicine Associates,
Boston, MA 02114-3117

Ph: (617) 726-2707

Reviews and Comments


Internal Medicine Doctors in Boston, MA

Kaitlyn My-tu Lam, MBBS
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Practice Location: Massachusetts General Hospital, 55 Fruit Street, Boston, MA 02114
Phone: 617-724-7738    
Kui Toh Gerard Leong, M.D.
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Practice Location: 55 Fruit Street, Massachusetts General Hospital, Boston, MA 02114
Phone: 617-726-8862    
Ruma Rajbhandari,
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Practice Location: 75 Francis St, Boston, MA 02115
Phone: 617-525-6841    
Alaka Ray, M.D.
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Medicare: Accepting Medicare Assignments
Practice Location: Massachusetts General Hospital, 55 Fruit Street, Boston, MA 02114
Phone: 617-726-2066    
Meghan E Sise, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: Massachusetts General Hospital, 55 Fruit Street, Boston, MA 02114
Phone: 617-726-2862    
Aaron Dickstein, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 800 Washington St, Box 233, Boston, MA 02111
Phone: 617-636-5883    Fax: 617-636-9292
Dr. Felicia Elizabeth Patch, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 801 Massachusetts Ave, Crosstown 2, Boston, MA 02118
Phone: 617-414-4376    Fax: 617-414-4676

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.