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AMY TESAR DO
NPI 1841307477
Internal Medicine in Mason City, IA

Active since August 23, 2006PECOS EnrolledAccepts Medicare Assignment
1000 4TH ST SW, MASON CITY, IA 50401(641) 428-6999(641) 428-6678 Get Directions Write a Review

NPPES record last updated: July 14, 2025. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Apr 26, 2021, Jul 31, 2020, Nov 8, 2019 (3 updates tracked since 2019).

About Amy Tesar Do NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

AMY TESAR DO (NPI 1841307477) is an individual internal medicine provider in Mason City, Iowa, licensed in Iowa (DO-03524) and active in the NPI registry since August 2006. She is enrolled in Medicare PECOS, is affiliated with Mercyone North Iowa Medical Center, and is a graduate of Other (2002).

NPPES Registry Identity

NPI1841307477
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameAMY TESARCredential: DO
Location Address1000 4TH ST SWMason City, IA 50401-2800
Mailing Address621 S Illinois Ave, Suite 103Mason City, IA 50401-5489 · (515) 532-2811 · Fax (515) 532-9336
Phone(641) 428-6999
Fax(641) 428-6678
Sole ProprietorNo
Medical School CMSOtherGraduated 2002
Enumeration DateAugust 23, 2006
Last NPPES UpdateJuly 14, 20253 updates tracked since enumeration
NPPES CertifiedJuly 14, 2025
✔ NPI 1841307477 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
Licenses✔ Licensed in IA · DO-03524✔ Licensed in IA · 03524
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Also ListedHospitalistTaxonomy 208M00000X · License 3524 (IA)
1000 4TH ST SW, Mason City, IA 50401
Open in Google Maps ↗

Other Identifiers 2

Medicaid0480475IA
Other04350IA · Wellmark

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Home State Health, Ambetter from NH Healthy Families, Ambetter from Sunflower Health Plan and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Amy Tesar Do is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID8527089580
PECOS Enrollment IDI20051219000247
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 5

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
525 services185 patients
Hospital discharge day management, 30 minutes or less 99238
Hospital discharge day management of 30 minutes or less includes finalizing your treatment, discussing your progress, and planning after-care at home. It ensures you're ready to leave the hospital and continue recovery safely.
148 services138 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
86 services82 patients
Hospital discharge day management, more than 30 minutes 99239
Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.
34 services34 patients
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
17 services17 patients

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Mercyone North Iowa Medical Center

Acute Care Hospitals · Mason City, IA
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number160064
Location1000 Fourth Street SWMason City, IA 50401 · Cerro Gordo County
Emergency services Birthing friendly

Franklin General Hospital

Critical Access Hospitals · Hampton, IA
OwnershipGovernment - Local
CMS Certification Number161308
Location1720 Central Avenue EastHampton, IA 50441 · Franklin County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 50401 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$122.23 typical visit price
range $52.96 – $161.40
Typical copayment $30.55 (range $13.24 – $40.35)
Most-billed visit code 99204
Established Patient
$94.05 typical visit price
range $16.91 – $131.98
Typical copayment $23.51 (range $4.22 – $32.99)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

LINDA S VOLD LISW
Social Worker (Clinical)
1000 4TH ST SW, SUITE BS
MASON CITY, IA 50401
Cerro Gordo County (641) 422-7797
BURT HUMBURG MD
Internal Medicine
1000 4TH ST SW
MASON CITY, IA 50401
Cerro Gordo County (641) 428-7000
SUMATHY NAGRAJ IYENGAR M.D.,
Hospitalist
1000 4TH ST SW, MERCY MEDICAL CENTER-HOSPITALIST DEPT
MASON CITY, IA 50401
Cerro Gordo County (641) 428-7000
DR. SATINDERJIT SINGH M.D.
Emergency Medicine
1000 4TH ST SW
MASON CITY, IA 50401
Cerro Gordo County (641) 428-7234
ASHLEY MATERN ARNP
Nurse Practitioner (Family)
1000 4TH ST SW
MASON CITY, IA 50401
Cerro Gordo County (641) 428-6999
ROBERT D. FROEHNER CRNA
Nurse Anesthetist, Certified Registered
1000 4TH ST SW
MASON CITY, IA 50401
Cerro Gordo County (641) 422-7000
DR. THOMAS P DELANEY MD
Hospitalist
1000 4TH ST SW, SUITE HOSP
MASON CITY, IA 50401
Cerro Gordo County (641) 422-7000
NORTH IOWA MERCY CLINICS
Nurse Practitioner
1000 4TH ST SW
MASON CITY, IA 50401
Cerro Gordo County (641) 428-5932

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Amy Tesar's NPI number?

The NPI number for Amy Tesar is 1841307477. It was assigned to this individual provider in the NPPES registry on August 23, 2006.

Where is Amy Tesar located?

Amy Tesar practices at 1000 4th St SW, Mason City, IA 50401. The listed phone number is (641) 428-6999.

What is Amy Tesar's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Amy Tesar enrolled in Medicare?

Yes. Amy Tesar is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

What insurance does Amy Tesar accept?

Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from Home State Health, Ambetter from NH Healthy Families and Ambetter from Sunflower Health Plan and 2 other insurers list Amy Tesar as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Amy Tesar affiliated with any hospitals?

According to CMS data, Amy Tesar is affiliated with Mercyone North Iowa Medical Center and Franklin General Hospital.

When was this NPI record last updated?

The NPPES record for Amy Tesar was last updated on July 14, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.