Thomas Dag Horn, MD - Medicare Dermatology in Boston, MA

Thomas Dag Horn, MD is a medicare enrolled "Dermatology" physician in Boston, Massachusetts. He went to University Of Virginia School Of Medicine and graduated in 1982 and has 42 years of diverse experience with area of expertise as Dermatology. He is a member of the group practice Massachusetts General Physicians Organization Inc and his current practice location is 55 Fruit St, Boston, Massachusetts. You can reach out to his office (for appointments etc.) via phone at (176) 658-9300.

Thomas Dag Horn is licensed to practice in Arkansas (license number E-1269) 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 1275620320.

Contact Information

Thomas Dag Horn, MD
55 Fruit St,
Boston, MA 02114-2621
(176) 658-9300
Not Available

Map and Direction




Physician's Profile

Full NameThomas Dag Horn
GenderMale
SpecialityDermatology
Experience42 Years
Location55 Fruit 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:
  • Thomas Dag Horn attended and graduated from University Of Virginia School Of Medicine in 1982
  NPI Data:
  • NPI Number: 1275620320
  • Provider Enumeration Date: 10/09/2006
  • Last Update Date: 09/16/2019
  Medicare PECOS Information:
  • PECOS PAC ID: 3476650763
  • Enrollment ID: I20070522000102

Medical Identifiers

Medical identifiers for Thomas Dag Horn such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1275620320NPI-NPPES
131654001MedicaidAR

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207ND0900XDermatology - Dermatopathology E-1269 (Arkansas)Secondary
207N00000XDermatology E-1269 (Arkansas)Primary

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Massachusetts General Physicians Organization Inc24663658203084

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. Thomas Dag Horn 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. Thomas Dag Horn 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
Thomas Dag Horn, MD
55 Fruit St,
Boston, MA 02114-2696

Ph: (176) 586-9300
Thomas Dag Horn, MD
55 Fruit St,
Boston, MA 02114-2621

Ph: (176) 658-9300

Reviews and Comments


Dermatology Doctors in Boston, MA

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Phone: 617-732-5500    

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.