Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Amy Tesar, DO

Individual provider Internal Medicine Physician · NPI 1841307477

Amy Tesar, DO is an Internal Medicine in Mason City, Iowa. Qualified in 2002, 24 years ago. Practices with North Iowa Mercy Clinics, a 300-clinician group and accepts Medicare assignment. Licensed in Iowa.

Years since qualifying
24
Licensed in
IA
In the registry since
2006
Specialties on file
3
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

1000 4th St SW
Mason City, IA 50401-2800
Phone: (641) 428-6999
Fax: (641) 428-6678
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence DO-03524 (IA)
Internal Medicine Physician Taxonomy 207R00000X · Licence 03524 (IA)
Hospitalist Physician Taxonomy 208M00000X · Licence 3524 (IA)

Record details

NPI number1841307477
Entity typeIndividual (Type 1)
GenderFemale
Credentials DO
Sole proprietorNo
NPI enumeratedAugust 23, 2006
Last updated in NPPESJuly 14, 2025
Certification dateJuly 14, 2025
Mailing address621 S Illinois Ave, Suite 103, Mason City, IA 50401-5489

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2002 (24 years in practice)
Group practice North Iowa Mercy Clinics — 300 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Other providers in Mason City