Justin A. Pieper, MD

Primary specialty

Clinical Cardiac Electrophysiology PhysicianTaxonomy code 207RC0001X

License

2025031646 Issued in MO

Practice address

625 S New Ballas Rd Ste 2015
Saint Louis, MO 63141-8253

Phone

(314) 251-1700

NPI assigned

Jun 8, 2017

Last updated

Aug 25, 2025By 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 MO

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

Internal MedicineAlso: Cardiac Electrophysiology

Education

Other, 2017

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Mercy Clinic Heart and Vascular LLCGroup PAC ID 8820016207, 112 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Mercy Hospital St Louis Hospital, Saint Louis, MO, CCN 260020
• Mercy Hospital South Hospital, Saint Louis, MO, CCN 260077

Procedures performed for Medicare patients

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, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• Mercy Clinic Heart and Vascular, LLC

  • Cardiovascular Disease Physician
  • Saint Louis, MO
  • NPI 1932176401
  Medicare reassignment Care Compare group NPD
• Mercy Clinic Cardiovascular and Thoracic Surgery, LLC

  • Vascular Surgery Physician
  • Washington, MO
  • NPI 1528192416
  NPD (past)

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

• Mercy Hospital South

  • General Acute Care Hospital
  • Saint Louis, MO
  • NPI 1568481984
  Care Compare affiliation
• Mercy Hospitals East Communities

  dba Mercy Hospital St Louis

  • General Acute Care Hospital
  • Saint Louis, MO
  • NPI 1427098169
  Care Compare affiliation
• Mercy Hospitals East Communities

  dba Mercy St. Louis Transport Ambulance

  • Land Ambulance
  • Saint Louis, MO
  • NPI 1881329902

  Hospital

  Care Compare affiliation

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

{
    "created_epoch": "1496880000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1756080000000",
    "number": "1528597846",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "625 S NEW BALLAS RD STE 2015",
            "city": "SAINT LOUIS",
            "state": "MO",
            "postal_code": "631418253",
            "telephone_number": "314-251-1700"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "625 S NEW BALLAS RD STE 2015",
            "city": "SAINT LOUIS",
            "state": "MO",
            "postal_code": "631418253",
            "telephone_number": "314-251-1700"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "625 S New Ballas Rd Ste 2030",
            "address_purpose": "LOCATION",
            "city": "Saint Louis",
            "state": "MO",
            "postal_code": "631418253",
            "country_code": "US",
            "telephone_number": "314-251-1700",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "1000 E Cherry St Fl 3",
            "address_purpose": "LOCATION",
            "city": "Troy",
            "state": "MO",
            "postal_code": "633791513",
            "country_code": "US",
            "telephone_number": "314-251-1700",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "PIEPER",
        "first_name": "JUSTIN",
        "middle_name": "A.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2017-06-08",
        "last_updated": "2025-08-25",
        "certification_date": "2025-08-25",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RC0001X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Clinical Cardiac Electrophysiology",
            "state": "MO",
            "license": "2025031646",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Mitchell Piel, MD
• Pamela A Piel, PNP
• Amanda Lynn Piela, ANP
• Alexander Piening
• Cole Piening
• Laura H Pieper, WHNP
• Lisa Pieper, LPN NCM
• Matthew A Pieper, D.O.
• Savannah Marilyn Pieper, CRNA
• Stephen J Pieper, MD

• Clinical Cardiac Electrophysiology Physician in Saint Louis, MO
• Providers in Saint Louis, MO by specialty
• Clinical Cardiac Electrophysiology Physician in Missouri

• 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.