NPPES file of Aug 9, 2026

Amy Tesar, DO

Internal Medicine Physician · Mason City, IA

Amy Tesar, DO is an internal medicine physician with a practice address in Mason City, Iowa, and NPI 1841307477, issued on Aug 23, 2006. Check the license (Iowa DO-03524, as entered in NPPES) on the Iowa Board of Medicine; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1841307477
Name
Amy Tesar
Credential
DO
Primary taxonomy
Internal Medicine Physician 207R00000X
License numbers
DO-03524 IA
03524 IA
3524 IA
Self-reported in NPPES; status is on the state search
Practice location
1000 4TH St SW, Mason City, IA 50401
Phone
(641) 428-6999
Enumerated
Aug 23, 2006
Record last updated
Jul 14, 2025
Fax
(641) 428-6678
Medicaid ID
0480475 IA
Medicare enrollment
Enrolled (PECOS I20051219000247); accepts Medicare assignment
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest internal medicine physician records → All 871 in Iowa → Look up another NPI →

Also registered at 1000 4TH St SW

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Mohamed Abdi, MDRadiation Oncology Physician1982162608
  2. Luna Acharya, MDHospitalist Physician1609224674
  3. Jenna AdamsMental Health Counselor1407790710
  4. Sheela Ahari, MDAnesthesiology Physician1518910462
  5. Tauseef Akhtar, MDCardiovascular Disease Physician1508218009
  6. Emad Alamouti-Fard, MDFamily Medicine Physician1811821499

Verify Amy Tesar in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersIowa Board of Medicine
    Search for license DO-03524    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Iowa license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Bills Medicare through one group practice

  1. North Iowa Mercy ClinicsMason City, IA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Amy Tesar among 871 internal medicine physician records in Iowa

Amy Tesar, DO is one of 871 internal medicine physician records with a practice address in Iowa. 70% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 11% of them.

  • NPI issued2006 · 11% of these records are older, 62% newer
  • In a Medicare fileYes · 70% of these records are
  • In the CMS Doctors and Clinicians fileYes · 44% of these records are
  • Graduated2002 · median 2008 among the 386 with a school on file
  • Record last updated2025 · 46% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Iowa practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

36 internal medicine physician records list a practice address in Mason City

They are 36 of the 866 NPPES records with a practice address in Mason City, and 871 internal medicine physician records in Iowa.

All 871 in Iowa → Every provider in Mason City → Internal Medicine Physician nationwide →

The 8 internal medicine physician records with the nearest ZIP codes

  1. Phillip Alscher, MDMason City, IA 504011700993888
  2. Vaughan Cipperly, MDMason City, IA 504011942235429
  3. Patrick Dunlay, DOMason City, IA 504011811004294
  4. Melissa Frame, MDMason City, IA 504011881796712
  5. Bruce Harlan, MDMason City, IA 504011336256593
  6. Mark Johnson, MDMason City, IA 504011013923127
  7. Janice Kirsch, MDMason City, IA 504011992809636
  8. Ali Mardan, PHD, MD, RPVI, FACPMason City, IA 504011619905353

Common questions

What is Amy Tesar, DO's NPI number?

Amy Tesar, DO's National Provider Identifier (NPI) is 1841307477, issued on Aug 23, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Amy Tesar, DO located?

The NPPES record lists a practice address at 1000 4TH St SW, Mason City, IA, 50401. Phone: (641) 428-6999. Providers update this record themselves, so call before visiting.

How can I verify Amy Tesar, DO's license?

NPPES lists Iowa license number DO-03524, as entered by the provider. Search the Iowa Board of Medicine at https://dial.iowa.gov/about-dial/boards-and-commissions/medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.