John Robyn V Diez, MD

Primary specialty

Addiction Medicine (Internal Medicine) PhysicianTaxonomy code 207RA0401X

License

D0102636 Issued in MD

Practice address

69 Wolf Acres Dr
Oakland, MD 21550-2046

Phone

(301) 533-2190

NPI assigned

Apr 20, 2021

Sex

Male

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in MD

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Addiction Medicine

Education

Other, 2014

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

Specialty Physicians of Garrett County, LLCGroup PAC ID 5698082436, 86 clinicians

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

Practice roles

Locations

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• Specialty Physicians of Garrett County, LLC

  • Obstetrics & Gynecology Physician
  • Oakland, MD
  • NPI 1265819866
  Medicare reassignment Care Compare group NPD
• Specialty Physicians of Garrett County, LLC

  • Mental Health Clinic/Center (Including Community Mental Health Center)
  • Oakland, MD
  • NPI 1871065813
  NPD
• Specialty Physicians of Garrett County, LLC

  • Mental Health Clinic/Center (Including Community Mental Health Center)
  • Grantsville, MD
  • NPI 1881361442
  NPD
• Osu Observation Medicine, LLC

  • Anesthesiology Physician
  • Columbus, OH
  • NPI 1407095052
  NPD (past)

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1618876800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1756080000000",
    "number": "1942881909",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "69 WOLF ACRES DR",
            "city": "OAKLAND",
            "state": "MD",
            "postal_code": "215502046",
            "telephone_number": "301-533-2190"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "69 WOLF ACRES DR",
            "city": "OAKLAND",
            "state": "MD",
            "postal_code": "215502046",
            "telephone_number": "301-533-2190"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "DIEZ",
        "first_name": "JOHN ROBYN",
        "middle_name": "V",
        "name_prefix": "Mr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2021-04-20",
        "last_updated": "2025-08-25",
        "certification_date": "2025-08-25",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RA0401X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Addiction Medicine",
            "state": "MD",
            "license": "D0102636",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Dennett SNF
• Dennett SNF LLC
• Diakon Lutheran Social Ministries
• Diekman Dysautonomia LLC
• Sarah Jean Diekman
• Michelle K Dixon, CRNP
• Mark Thomas Domenick, MD
• Lynda S Dougherty, M.D.
• Dr. Stewart Callis
• Dream Dental Rhodes P.C.

• Addiction Medicine (Internal Medicine) Physician in Oakland, MD
• Providers in Oakland, MD by specialty
• Addiction Medicine (Internal Medicine) Physician in Maryland

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 25, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.