Mark D Olszyk, MD

Primary specialty

Emergency Medicine PhysicianTaxonomy code 207P00000X

License

D0072926 Issued in MD

Practice address

200 Memorial Ave
Westminster, MD 21157-5726

Phone

(410) 871-6129

NPI assigned

Jul 26, 2006

Last updated

Jan 14, 2026By the provider in NPPES

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

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: mark.olszyk.1@9462.direct.athenahealth.com

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

• Carroll Health Group, LLC

  • Internal Medicine Physician
  • Westminster, MD
  • NPI 1437473550
  Medicare reassignment NPD
• Sinai Hospital of Baltimore, Inc

  • General Acute Care Hospital
  • Baltimore, MD
  • NPI 1790997369
  Medicare reassignment NPD
• Sinai Hospital of Baltimore Inc

  • Internal Medicine Physician
  • Baltimore, MD
  • NPI 1760007041
  NPD
• Sinai Hospital of Baltimore, Inc.

  • General Acute Care Hospital
  • Baltimore, MD
  • NPI 1285672204
  NPD
• Carroll Health Group, LLC

  • Surgery Physician
  • Westminster, MD
  • NPI 1194512319
  NPD (past)

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

{
    "created_epoch": "1153872000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1768348800000",
    "number": "1295759207",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "200 MEMORIAL AVE",
            "city": "WESTMINSTER",
            "state": "MD",
            "postal_code": "211575726",
            "telephone_number": "410-871-6129",
            "fax_number": "410-871-7474"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "200 MEMORIAL AVE",
            "city": "WESTMINSTER",
            "state": "MD",
            "postal_code": "211575726",
            "telephone_number": "410-871-6129"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "OLSZYK",
        "first_name": "MARK",
        "middle_name": "D",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-07-26",
        "last_updated": "2026-01-14",
        "certification_date": "2026-01-14",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "MD",
            "license": "D0072926",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Ajibola Bukola Olagunju, CNM
• Old Westminster Pike Anesthesia LLC
• Lawrence Olenginski, CRNA
• Danielle Oliveri
• Gregory Allen Olson, O.D.
• Rebecca Olukoya
• Aminat O. Oluyemi, MD
• Om Cardiology, LLC
• Om Cardiovascular, LLC (Cardiovascular Consultants of Carroll County)
• Om Cardiovascular, P.C.

• Emergency Medicine Physician in Westminster, MD
• Providers in Westminster, MD by specialty
• Emergency Medicine Physician in Maryland

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jan 14, 2026; 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.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.