Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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Frederick Simon Isaak, MD

Individual provider Emergency Medicine Physician · NPI 1639129281

Frederick Simon Isaak, MD is registered under Family Practice in Dubuque, Iowa. Graduated from University of North Dakota School of Medicine in 1986, 40 years ago. Practices with Medical Associates Clinic P C, a 227-clinician group and accepts Medicare assignment. Licensed in Iowa.

Years since qualifying
40
Trained at
University of North Dakota School of Medicine
Licensed in
IA
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1000 Langworthy St
Dubuque, IA 52001-7313 Not confirmed with CMS for 18 years — call before visiting
Phone: (563) 584-3455
Fax: (563) 584-3177
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 28293 (IA)
Occupational Medicine Physician Taxonomy 2083X0100X · Licence 28293 (IA)

Record details

NPI number1639129281
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 12, 2006
Last updated in NPPESApril 11, 2008

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolUNIVERSITY OF NORTH DAKOTA SCHOOL OF MEDICINE
Graduated 1986 (40 years in practice)
Group practice Medical Associates Clinic P C — 227 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients47
Services billed 101 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Colleagues at Medical Associates Clinic P C

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 227 clinicians in the practice; 12 are shown here.

Other providers in Dubuque