Doctor profile · Federal record
Dr. Katherine Willems, FNP
Family Nurse Practitioner · Clearlake, CA
- NPI 1134393069
- MIPS 72.1 / 100 · 2023
- 18 yrs on file
- Female
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
15230 Lakeshore Dr
Clearlake, CA 954228107
(707) 995-4500
Credentials & registration
- NPI registered
- April 2008 — 18 yrs on file
- Profile last updated
- March 4, 2014
- Specialty taxonomy
- 363LF0000X — NUCC code
- State license (1)
- California #404784-7693
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1134393069. Last verified May 11, 2026.Open Payments
Industry payments received
All-time total
$18
Transactions
1
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Indivior INC. | 1 | $18.18 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
1,435
Patients
481
Total drug cost
$36,621
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Atorvastatin Calcium | Generic | 209 | 75 | $4,429 |
| Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) | Brand | 141 | 25 | $4,023 |
| Levothyroxine Sodium | Generic | 138 | 49 | $3,974 |
| Amlodipine Besylate | Generic | 115 | 45 | $2,005 |
| Losartan Potassium | Generic | 115 | 42 | $1,968 |
| Lisinopril | Generic | 102 | 37 | $1,532 |
| Gabapentin | Generic | 99 | 35 | $3,589 |
| Rosuvastatin Calcium | Generic | 90 | 32 | $3,222 |
| Metformin Hcl | Generic | 75 | 21 | $1,313 |
| Omeprazole | Generic | 70 | 27 | $1,703 |
Frequently asked questions
What is Dr. Katherine Willems's medical specialty?
Dr. Katherine Willems practices Family Nurse Practitioner in Clearlake, CA.
Where does Dr. Katherine Willems practice?
Dr. Katherine Willems practices at 15230 Lakeshore Dr, Clearlake, CA 954228107. Office phone: 7079954500.
What is Dr. Katherine Willems's NPI?
Dr. Katherine Willems's National Provider Identifier (NPI) is 1134393069, issued by NPPES.