Marc St Cyr, MD

Primary specialty

Emergency Medicine PhysicianTaxonomy code 207P00000X

License

MD485187 Issued in PA

Practice address

255 W Lancaster Ave
Paoli, PA 19301-1763

Phone

(484) 565-1000

NPI assigned

May 14, 2019

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 PA

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

Emergency Medicine

Education

University of Texas Medical School at Houston, 2020

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Main Line Emergency Med Associates LLCGroup PAC ID 9234034729, 51 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Paoli Hospital Hospital, Paoli, PA, CCN 390153

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

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.

• Main Line Emergency Med Associates LLC

  • Emergency Medicine Physician
  • Paoli, PA
  • NPI 1316919368
  Medicare reassignment Care Compare group NPD
• Bayfront Emergency Physicians PA

  • Emergency Medicine Physician
  • Somers Point, NJ
  • NPI 1215998273
  NPD (past)

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Main Line Hospitals, Inc.

  • General Acute Care Hospital
  • Paoli, PA
  • NPI 1215042114
  Care Compare affiliation

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

{
    "created_epoch": "1557792000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1762732800000",
    "number": "1356907414",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "255 W LANCASTER AVE",
            "city": "PAOLI",
            "state": "PA",
            "postal_code": "193011763",
            "telephone_number": "484-565-1044"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "255 W LANCASTER AVE",
            "city": "PAOLI",
            "state": "PA",
            "postal_code": "193011763",
            "telephone_number": "484-565-1000"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "ST CYR",
        "first_name": "MARC",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2019-05-14",
        "last_updated": "2025-11-10",
        "certification_date": "2025-11-10",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "PA",
            "license": "MD485187",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Becky A Souder, DO
• Teri J Speakman, OTR L CHT
• Sally G Speck, MD
• Chelsea Spehalski, CRNP
• Wendy Gayle Spielman, OTR
• Richard Stagliano, MSW
• George H Steele, MD
• Alexander Gabriel Stefanini, LPC
• Melissa Ann Stefanosky, PA-C
• Deborah Leigh Stein, MD

• Emergency Medicine Physician in Paoli, PA
• Providers in Paoli, PA by specialty
• Emergency Medicine Physician in Pennsylvania

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Nov 10, 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.