Katja Von Tiesenhausen, M.D.

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

216177 Issued in MA

Practice address

10 Gove St
East Boston, MA 02128-1920

Phone

(617) 569-5800

Fax

(617) 568-4780

NPI assigned

Feb 16, 2006

Sex

Female

Sole proprietor

No

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

Specialties & licenses 1

Addresses

Other identifiers 1

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

Merit-based Incentive Payment System (MIPS)

Final score

90.3 of 100Reported as group

Quality

80.55

Improvement activities

40

Cost

75.2

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.

• Merrimack Valley Emergency Associates, Inc.

  • Emergency Medicine Physician
  • Lowell, MA
  • NPI 1821280959
  Medicare reassignment NPD

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

{
    "created_epoch": "1140048000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1902870793",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "10 GOVE ST",
            "city": "EAST BOSTON",
            "state": "MA",
            "postal_code": "021281920",
            "telephone_number": "617-569-5800",
            "fax_number": "617-568-4780"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "10 GOVE ST",
            "city": "EAST BOSTON",
            "state": "MA",
            "postal_code": "021281920",
            "telephone_number": "617-569-5800",
            "fax_number": "617-568-4780"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "VON TIESENHAUSEN",
        "first_name": "KATJA",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2006-02-16",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "MA",
            "license": "216177",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "2008904",
            "state": "MA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Nikolai Velev, M.D.
• Alyssa Renee Velotta, CNP
• Magnolia Venegas, D.M.D.
• Raul Vidoudez, NP
• Rebecca A Von Barta, NP
• Walgreen Co (Walgreens #05756)
• Walgreen Co
• Erin Meghan Walsh-Mulkerrin, CNP
• Carolyn Olson Walsh, M.D.
• Ellen Walsh, RNP

• Internal Medicine Physician in East Boston, MA
• Providers in East Boston, MA by specialty
• Internal Medicine Physician in Massachusetts

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 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.