Doctor profile · Federal record
Dr. Katherine Diemer, MD
Family Medicine Physician (CMS: Family Practice) · Family Medicine Physician · Freeport, IL
- NPI 1396906749
- Accepts Medicare
- 20 yrs in practice
- Licensed in 2 states
- Female
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
1301 Kiwanis Dr
Freeport, IL 610326907
(815) 235-1406 - Mailing address
-
515 22Nd Ave
Monroe, WI 535661569
Credentials & registration
- NPI registered
- June 2008 — 18 yrs on file
- Profile last updated
- December 18, 2020
- Year of graduation
- 2006 — 20 yrs since
- Specialty taxonomy
- 207Q00000X — NUCC code
- State licenses (2)
- Illinois #125051266 · Wisconsin #57640
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1396906749. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
511
Distinct HCPCS
4
Medicare allowed
$46,358
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 247 | 138 | $96 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 180 | 115 | $65 | |
G0439 |
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 73 | 73 | $126 | |
G0438 |
Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit | 11 | 11 | $162 |
In context: peer comparison
Among 8 peers in Freeport Family Medicine Physician, average services per provider: 98. This provider delivers 5.2× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
2,526
Patients
661
Total drug cost
$36,305
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Lisinopril | Generic | 293 | 80 | $3,153 |
| Atorvastatin Calcium | Generic | 275 | 72 | $3,361 |
| Levothyroxine Sodium | Generic | 246 | 56 | $3,119 |
| Amlodipine Besylate | Generic | 204 | 55 | $1,553 |
| Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) | Brand | 197 | 57 | $6,291 |
| Metformin Hcl | Generic | 190 | 55 | $1,377 |
| Furosemide | Generic | 150 | 36 | $789 |
| Gabapentin | Generic | 148 | 36 | $3,560 |
| Hydrochlorothiazide | Generic | 128 | 38 | $603 |
| Metoprolol Succinate | Generic | 122 | 28 | $3,208 |
Frequently asked questions
What is Dr. Katherine Diemer's medical specialty?
Dr. Katherine Diemer practices Family Medicine Physician in Freeport, IL.
Where does Dr. Katherine Diemer practice?
Dr. Katherine Diemer practices at 1301 Kiwanis Dr, Freeport, IL 610326907. Office phone: 8152351406.
What is Dr. Katherine Diemer's NPI?
Dr. Katherine Diemer's National Provider Identifier (NPI) is 1396906749, issued by NPPES.
Does Dr. Katherine Diemer accept Medicare assignment?
Yes. Dr. Katherine Diemer accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Katherine Diemer commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); Established patient office or other outpatient visit (HCPCS 99213); Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (HCPCS G0439). Source: CMS Medicare Physician & Other Practitioners file.