Amy Tesar, DO

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

DO-03524 Issued in IA

Practice address

1000 4TH St SW
Mason City, IA 50401-2800

Phone

(641) 428-6999

Fax

(641) 428-6678

NPI assigned

Aug 23, 2006

Sex

Female

Sole proprietor

No

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

Specialties & licenses 3

Addresses

Other identifiers 2

Electronic endpoints 1

Medicare fee-for-service enrollment

Enrolled in IA

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 Medicine

Education

Other, 2002

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

North Iowa Mercy ClinicsGroup PAC ID 7810809076, 304 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Mercyone North Iowa Medical Center Hospital, Mason City, IA, CCN 160064
• Franklin General Hospital Hospital, Hampton, IA, CCN 161308

Merit-based Incentive Payment System (MIPS)

Final score

81.55 of 100Reported as group

Quality

73.89

Promoting interoperability

93

Improvement activities

40

Cost

70.44

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Osteopathy

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: atesar3959174@direct.trinity-health.org

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.

• North Iowa Mercy Clinics

  • Anesthesiology Physician
  • Mason City, IA
  • NPI 1780278242
  Medicare reassignment Care Compare group NPD
• North Iowa Mercy Clinics

  • Family Medicine Physician
  • Mason City, IA
  • NPI 1942211982
  NPD
• North Iowa Mercy Clinics

  • Sports Medicine (Family Medicine) Physician
  • Mason City, IA
  • NPI 1982300349
  NPD
• Mercy Health Services-Iowa Corp

  • Community/Retail Pharmacy
  • Northwood, IA
  • NPI 1316909484
  NPD (past)
• Mercy Health Services-Iowa Corp

  • Rural Acute Care Hospital
  • Mason City, IA
  • NPI 1467537886
  NPD (past)

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

• Franklin General Hospital

  • Critical Access Hospital
  • Hampton, IA
  • NPI 1477637759
  Care Compare affiliation
• Mercy Health Services-Iowa Corp

  • Rural Acute Care Hospital
  • Mason City, IA
  • NPI 1467537886
  Care Compare affiliation

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

{
    "created_epoch": "1156291200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1752451200000",
    "number": "1841307477",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "621 S ILLINOIS AVE",
            "address_2": "SUITE 103",
            "city": "MASON CITY",
            "state": "IA",
            "postal_code": "504015489",
            "telephone_number": "515-532-2811",
            "fax_number": "515-532-9336"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1000 4TH ST SW",
            "city": "MASON CITY",
            "state": "IA",
            "postal_code": "504012800",
            "telephone_number": "641-428-6999",
            "fax_number": "641-428-6678"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "TESAR",
        "first_name": "AMY",
        "credential": "DO",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2006-08-23",
        "last_updated": "2025-07-14",
        "certification_date": "2025-07-14",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "IA",
            "license": "03524",
            "primary": false
        },
        {
            "code": "208M00000X",
            "taxonomy_group": "",
            "desc": "Hospitalist",
            "state": "IA",
            "license": "3524",
            "primary": false
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "IA",
            "license": "DO-03524",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "0480475",
            "state": "IA"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "WELLMARK",
            "identifier": "04350",
            "state": "IA"
        }
    ],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "atesar3959174@direct.trinity-health.org",
            "affiliation": "N",
            "endpointDescription": "MercyOne North Iowa Direct Email",
            "use": "DIRECT",
            "useDescription": "Direct",
            "contentType": "OTHER",
            "contentTypeDescription": "Other",
            "contentOtherDescription": "CCDA",
            "address_1": "1000 4th St SW",
            "city": "Mason City",
            "state": "IA",
            "country_code": "US",
            "postal_code": "504012800",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Saida Shaikh Tasseff, PHARMD
• Andrea Laura Tatkon-Coker, APMHNP-BC
• James Tatkon-Coker, M.D.
• Bryan Taylor, DO
• Julie Lynn Taylor, LISW
• Jennifer Thackery, D.D.S.
• Yuvaraj Thangaraj, MD
• The Nettleton Dental Group, PC
• Dawn D Theilen, ARNP
• Trisha Lynn Thoma, M.D.

• Internal Medicine Physician in Mason City, IA
• Providers in Mason City, IA by specialty
• Internal Medicine Physician in Iowa

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 14, 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.