Erik Aron Holzwanger, M.D.

Primary specialty

Gastroenterology PhysicianTaxonomy code 207RG0100X

License

277398 Issued in MA

Practice address

800 Washington St
Boston, MA 02111-1552

Phone

(617) 636-5000

NPI assigned

Apr 14, 2015

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 MA

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

Gastroenterology

Education

Other, 2014

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

Integrated Gastroenterology Consultants, P.C.Group PAC ID 0941260897, 35 clinicians

BMC Affiliated Physicians, Inc.Group PAC ID 9830133123, 543 clinicians

Pratt Medical Group IncGroup PAC ID 3375515661, 282 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Tufts Medical Center Hospital, Boston, MA, CCN 220116
• Lowell General Hospital Hospital, Lowell, MA, CCN 220063
• Merrimack Health Lawrence Hospital Hospital, Lawrence, MA, CCN 220010
• Melrosewakefield Healthcare Hospital, Melrose, MA, CCN 220070
• South Shore Hospital Hospital, South Weymouth, MA, CCN 220100

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.

• BMC Affiliated Physicians, Inc.

  • Internal Medicine Physician
  • Boston, MA
  • NPI 1245320910
  Medicare reassignment Care Compare group NPD
• Pratt Medical Group, Inc

  • Internal Medicine Physician
  • Boston, MA
  • NPI 1275570319

  Gastroenterology

  Medicare reassignment Care Compare group NPD
• Integrated Gastroenterology Consultants, PC

  • Physical Therapist
  • North Chelmsford, MA
  • NPI 1396075123

  Gastroenterology

  Medicare reassignment Care Compare group NPD (past)
• Hallmark Health Medical Associates Inc

  • Family Medicine Physician
  • Medford, MA
  • NPI 1770563900

  Gastroenterology

  Medicare reassignment NPD
• Physicians of Cape Cod Hospital

  • Neuroradiology Physician
  • Hyannis, MA
  • NPI 1679832364
  Medicare reassignment NPD
• Igc III PLLC

  • Gastroenterology Physician
  • Lowell, MA
  • NPI 1053010694
  NPD
• Pratt Medical Group, Inc

  • Gastroenterology Physician
  • Boston, MA
  • NPI 1013237809
  NPD
• Pratt Medical Group, Inc

  • Pulmonary Disease Physician
  • Boston, MA
  • NPI 1508187642
  NPD

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

• Lawrence General Hospital

  • General Acute Care Hospital
  • Lawrence, MA
  • NPI 1750381281
  Care Compare affiliation
• Melrosewakefield Healthcare, Inc.

  • General Acute Care Hospital
  • Medford, MA
  • NPI 1841290467
  Care Compare affiliation
• South Shore Hospital Inc.

  • General Acute Care Hospital
  • South Weymouth, MA
  • NPI 1134227606
  Care Compare affiliation
• The Lowell General Hospital

  • General Acute Care Hospital
  • Lowell, MA
  • NPI 1407804669
  Care Compare affiliation
• Tufts Medical Center, Inc.

  • General Acute Care Hospital
  • Boston, MA
  • NPI 1730132515
  Care Compare affiliation

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

{
    "created_epoch": "1428969600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1767571200000",
    "number": "1457747776",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "65 HAMILTON AVE",
            "city": "HAVERHILL",
            "state": "MA",
            "postal_code": "018303313",
            "telephone_number": "978-771-7212"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "800 WASHINGTON ST",
            "city": "BOSTON",
            "state": "MA",
            "postal_code": "021111552",
            "telephone_number": "617-636-5000"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "55 Lake Ave N",
            "address_purpose": "LOCATION",
            "city": "Worcester",
            "state": "MA",
            "postal_code": "016550002",
            "country_code": "US",
            "telephone_number": "508-334-1000",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "736 Cambridge St",
            "address_purpose": "LOCATION",
            "city": "Brighton",
            "state": "MA",
            "postal_code": "02135",
            "country_code": "US",
            "telephone_number": "617-562-5432",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "HOLZWANGER",
        "first_name": "ERIK",
        "middle_name": "ARON",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2015-04-14",
        "last_updated": "2026-01-05",
        "certification_date": "2026-01-05",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RG0100X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Gastroenterology",
            "state": "MA",
            "license": "277398",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Deborah Lees Holtorf, PNP
• Alexander Matthew Holtz, M.D., PH.D.
• Meredith Holtz, CRNA
• Allison Kelly Holzman, MD
• Robert S Holzman, MD
• Home Instead by Honor Massachusetts, Inc.
• Daria Rachelle Homenko, M.D.
• Benjamin Jei-Ming Homer
• Briton Homer
• Marc J. Homer, M.D.

• Gastroenterology Physician in Boston, MA
• Providers in Boston, MA by specialty
• Gastroenterology Physician in Massachusetts

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jan 5, 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.
• 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.