Timothy J Ernst, MD - Medicare Internal Medicine in Natick, MA

Timothy J Ernst, MD is a medicare enrolled "Internal Medicine - Medical Oncology" physician in Natick, Massachusetts. His current practice location is 67 Union St, Suite 206, Natick, Massachusetts. You can reach out to his office (for appointments etc.) via phone at (508) 655-0065.

Timothy J Ernst is licensed to practice in Massachusetts (license number 52630) 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 1972542975.

Contact Information

Timothy J Ernst, MD
67 Union St, Suite 206,
Natick, MA 01760-7700
(508) 655-0065
Not Available

Map and Direction




Physician's Profile

Full NameTimothy J Ernst
GenderMale
SpecialityInternal Medicine - Medical Oncology
Location67 Union St, Natick, Massachusetts
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1972542975
  • Provider Enumeration Date: 06/05/2006
  • Last Update Date: 06/13/2012
  Medicare PECOS Information:
  • PECOS PAC ID: 6002855673
  • Enrollment ID: I20050503000571

Medical Identifiers

Medical identifiers for Timothy J Ernst such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1972542975NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RX0202XInternal Medicine - Medical Oncology 52630 (Massachusetts)Primary

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. Timothy J Ernst 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 NameMass General Brigham Medical Group Suburban Massachusetts Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1538191218
PECOS PAC ID: 0244133494
Enrollment ID: O20040127001012
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. Timothy J Ernst 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
Timothy J Ernst, MD
67 Union St, Suite 206,
Natick, MA 01760-7700

Ph: (508) 655-0065
Timothy J Ernst, MD
67 Union St, Suite 206,
Natick, MA 01760-7700

Ph: (508) 655-0065

Reviews and Comments


Internal Medicine Doctors in Natick, MA

Wendy J. Parker, M.D.
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 307 W Central St, Natick, MA 01760
Phone: 508-820-8383    Fax: 508-820-0250
Dr. Simone Mordas, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 192 Worcester Rd, Natick, MA 01760
Phone: 508-647-1040    Fax: 508-647-1080
Trista N Repassy, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 190 N Main St, First Floor, Natick, MA 01760
Phone: 508-655-2555    Fax: 508-655-2596
Dr. Dainius Juknelis, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 67 Union St Ste 407, Natick, MA 01760
Phone: 508-881-3029    Fax: 508-650-9413
Dr. Lawrence Handler, M.D.
Internal Medicine
Medicare: Medicare Enrolled
Practice Location: 67 Union St, Suite 201, Natick, MA 01760
Phone: 508-651-1998    Fax: 508-651-2587
Dr. Leslie Gerald Selbovitz, MD
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 11 Morgan Dr, Unit 205, Natick, MA 01760
Phone: 617-899-9334    
Dr. Robert Barry Downes, MD
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 169 Pine St, Natick, MA 01760
Phone: 508-647-0100    

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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