Katherine A. Diemer, MD
NPI 1396906749ActiveIndividual· Family Medicine· Freeport, IL
Family Medicine (MD) in Freeport, Illinois, trained at Rush Medical College of Rush University (class of 2006). Their prescriptions cost Medicare Part D more than their services did: $424,343 for 6,259 claims, against $36,725 paid for services in 2024.
Overview
| NPI | 1396906749 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 18, 2008 |
| Last updated in NPPES | Dec 18, 2020 |
| Certified by provider | Dec 18, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Family Medicine Primary | 207Q00000X | 125051266 | IL |
| Family Medicine | 207Q00000X | 57640 | WI |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Family Practice (IL); Practitioner - Family Practice (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 217 |
|---|---|
| Services billed | 572 across 23 procedure codes |
| Paid by Medicare | $36,725 |
Part D prescriptions in 2024
| Prescriptions (claims) | 6,259 · 13,046 30-day fills |
|---|---|
| Patients | 495 |
| Total drug cost | $424,343 |
| Generic share | 88% of claims |
Education and affiliations
| Medical school | Rush Medical College of Rush University |
|---|---|
| Graduation year | 2006 |
| Medicare specialty | Family Practice |
| Telehealth | Offers telehealth |
Medical group
- The Monroe Clinic, Inc.Monroe, WI · 199 clinicians
Hospital affiliations
- Fhn Memorial HospitalFreeport, IL
- The Monroe ClinicMonroe, WI
Other facilities
- Tri-State Home Healthcare, LLCHome health agency · Freeport, IL
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 17 family medicine physicians in Freeport · All family medicine physicians in Illinois