Mr John Robyn V Diez, MD - Medicare Internal Medicine in Oakland, MD

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Mr John Robyn V Diez, MD is a medicare enrolled "Internal Medicine - Addiction Medicine" physician in Oakland, Maryland. His current practice location is 69 Wolf Acres Dr, Oakland, Maryland. You can reach out to his office (for appointments etc.) via phone at (301) 533-2190.

Mr John Robyn V Diez is licensed to practice in Maryland (license number D0102636) 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 1942881909.

Contact Information

Mr John Robyn V Diez, MD
69 Wolf Acres Dr,
Oakland, MD 21550-2046
(301) 533-2190
Not Available

Map and Direction




Physician's Profile

Full NameMr John Robyn V Diez
GenderMale
SpecialityInternal Medicine - Addiction Medicine
Location69 Wolf Acres Dr, Oakland, Maryland
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1942881909
  • Provider Enumeration Date: 04/20/2021
  • Last Update Date: 08/25/2025
  Medicare PECOS Information:
  • PECOS PAC ID: 4284158882
  • Enrollment ID: I20250404000628

Medical Identifiers

Medical identifiers for Mr John Robyn V Diez such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1942881909NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RA0401XInternal Medicine - Addiction Medicine D0102636 (Maryland)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. Mr John Robyn V Diez allows following entities to bill medicare on his behalf.
Entity NameSpecialty Physicians Of Garrett County, Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1265819866
PECOS PAC ID: 5698082436
Enrollment ID: O20150911000591

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. Mr John Robyn V Diez 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
Mr John Robyn V Diez, MD
69 Wolf Acres Dr,
Oakland, MD 21550-2046

Ph: (301) 533-2190		Mr John Robyn V Diez, MD
69 Wolf Acres Dr,
Oakland, MD 21550-2046

Ph: (301) 533-2190

Reviews and Comments


Internal Medicine Doctors in Oakland, MD

Margaret A Kaiser, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 251 N 4th St, Oakland, MD 21550
Phone: 301-533-4000    Fax: 301-895-8751

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.