Katherine Robin Willems, FNP
Family Nurse Practitioner · Clearlake, CA
Katherine Robin Willems, FNP is a family nurse practitioner with a practice address in Clearlake, California, and NPI 1134393069, issued on Apr 22, 2008. Check the license (California 404784-7693, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Katherine Robin Willems
- Credential
- FNP
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License number
- 404784-7693 CA
Self-reported in NPPES; status is on the state search - Practice location
- 15230 Lakeshore Dr, Clearlake, CA 95422
- Phone
- (707) 995-4500
- Enumerated
- Apr 22, 2008
- Record last updated
- Mar 4, 2014 (not updated in 12 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 16,966 in California → Look up another NPI →
Also registered at 15230 Lakeshore Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Marisol AguilarCommunity Health Worker1699411603
- Veronica ArroyoCommunity Health Worker1730710617
- Pari Azari, M.D.Interventional Pain Medicine Physician1942442132
- Arthur Bikangaga, MDSurgery Physician1952319030
- Jerylyn Bohlender, LCSWClinical Social Worker1750782488
- Daniel Boucher, MDFamily Medicine Physician1164115549
Verify Katherine Robin Willems in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 404784-7693Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
87% more Medicare Part D claims than the average family nurse practitioner in 2024
2,435 Medicare Part D claims for 277 beneficiaries, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 119 claims were for opioids.
Most prescribed
- Atorvastatin Calcium135 claims
- Losartan Potassium114 claims
- Amlodipine Besylate102 claims
- Levothyroxine Sodium96 claims
- Gabapentin94 claims
- Lisinopril87 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 73.8 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $18.18
1 payment: food and beverage; the largest payer was Indivior Inc. The 99,489 providers of this specialty with any payment received $650.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Katherine Robin Willems among 16,966 family nurse practitioner records in California
Katherine Robin Willems, FNP is one of 16,966 family nurse practitioner records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 13% of them.
- NPI issued2008 · 13% of these records are older, 85% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileNo · 40% of these records are
- Record last updated2014 · 42% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LF0000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
8 family nurse practitioner records list a practice address in Clearlake
They are 8 of the 321 NPPES records with a practice address in Clearlake, and 16,966 family nurse practitioner records in California.
All 16,966 in California → Every provider in Clearlake → Family Nurse Practitioner nationwide →
The 8 family nurse practitioner records with the nearest ZIP codes
- Ciaran Carroll, FNP, MSNClearlake, CA 954221720597339
- Martina Cordova, FNPClearlake, CA 954221114793643
- Stephenie Hargrove, NPClearlake, CA 954221053927608
- Ann LaroccaClearlake, CA 954221306149240
- Olatunde OwoeyeClearlake, CA 954221487165817
- Julie Payette, FNPClearlake, CA 954221902066764
- Dwayne Yee, FNP-BCClearlake, CA 954221891422416
- Aura PalmaClearlake Oaks, CA 954231699227595
Common questions
What is Katherine Robin Willems, FNP's NPI number?
Katherine Robin Willems, FNP's National Provider Identifier (NPI) is 1134393069, issued on Apr 22, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Katherine Robin Willems, FNP located?
The NPPES record lists a practice address at 15230 Lakeshore Dr, Clearlake, CA, 95422. Phone: (707) 995-4500. Providers update this record themselves, so call before visiting.
How can I verify Katherine Robin Willems, FNP's license?
NPPES lists California license number 404784-7693, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Katherine Robin Willems, FNP prescribe under Medicare Part D?
In 2024, Katherine Robin Willems, FNP had 2,435 Medicare Part D claims for 277 beneficiaries; the average among family nurse practitioner prescribers was 1,305. Part D covers Medicare prescriptions only.
What is Katherine Robin Willems, FNP's MIPS final score?
The 2023 MIPS final score is 73.8 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.