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

Dr. Katherine A Diemer, MD

Individual provider Family Medicine Physician · NPI 1396906749

Dr. Katherine A Diemer, MD is registered under Family Practice in Freeport, Illinois. Graduated from Rush Medical College of Rush University in 2006, 20 years ago. Practices with The Monroe Clinic, Inc, a 201-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Illinois and Wisconsin.

Years since qualifying
20
Trained at
Rush Medical College of Rush University
Licensed in
IL, WI
In the registry since
2008
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

1301 Kiwanis Dr
Freeport, IL 61032-6907
Phone: (815) 235-1406
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 125051266 (IL)
Family Medicine Physician Taxonomy 207Q00000X · Licence 57640 (WI)

Record details

NPI number1396906749
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 18, 2008
Last updated in NPPESDecember 18, 2020
Certification dateDecember 18, 2020

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolRUSH MEDICAL COLLEGE OF RUSH UNIVERSITY
Graduated 2006 (20 years in practice)
Group practice The Monroe Clinic, Inc. — 201 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations3 on file with Medicare

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 patients217
Services billed 572 a service is one billed item, such as a visit, a test or a procedure
Average patient age72

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.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at The Monroe Clinic, Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 201 clinicians in the practice; 12 are shown here.

Other providers in Freeport