What is Katherine Willems's specialty?

Katherine Willems (NPI 1134393069) is a Medicare-billing provider whose primary specialty is Nurse Practitioner in Clearlake, CA.

Where does Katherine Willems practice?

Katherine Willems practices in Clearlake, CA, based on the location reported in the CMS Medicare provider datasets for NPI 1134393069.

How much does Medicare pay Katherine Willems?

Medicare Part B utilization, prescribing (Part D), MIPS quality scores, and industry payments for Katherine Willems (NPI 1134393069) are detailed on this CareTrace profile.

PROVIDER PROFILE · NPI 1134393069

Katherine Willems

PRACTICELAKE HEALTH SERVICESSee all providers at this practice →

Nurse PractitionerClearlake, CAI

MEDICARE UTILIZATION · PART B · 2024

No data available for this provider in 2024.

PRESCRIBING · PART D · 2024

Total Rx claims

1,821

Beneficiaries

—

Total drug cost

$195K

Distinct drugs

Brand share

19.0%

Top prescribed drugs

Atorvastatin Calcium135 claims

Losartan Potassium114 claims

Amlodipine Besylate102 claims

Levothyroxine Sodium96 claims

Gabapentin94 claims

QUALITY · MIPS · 2024

No data available for this provider in 2024.

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2025

No data available for this provider in 2025.

REFERRAL NETWORK

Where Katherine Willems's patients come from & go

Directional shared-patient flow from Medicare claims — who sends patients to this provider (inbound) and where this provider's patients go next (outbound). 3 inbound referrers · 7 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
ADVENTIST HEALTH CLEARLAKE HOSPITAL INC.	45	76
David Lounsberry Family Practice · Oroville, CA	18	31
Kimberly Fordham Family Practice · Middletown, CA	12	21

Refers patients to

Outbound — where patients go next

Physician	Patients	Visits
ADVENTIST HEALTH CLEARLAKE HOSPITAL INC.	44	92
ADVENTIST HEALTH CLEARLAKE HOSPITAL INC.	40	88
ADVENTIST HEALTH CLEARLAKE HOSPITAL INC.	31	45
Kimberly Fordham Family Practice · Middletown, CA	23	47
David Lounsberry Family Practice · Oroville, CA	20	44
SUTTER BAY HOSPITALS	15	45
ADVENTIST HEALTH CLEARLAKE HOSPITAL INC.	11	23

Source: CMS Physician Shared Patient Patterns (30-day window, Medicare FFS). Direction = a beneficiary seen by the first provider, then the second, within 30 days; a proxy for referral, not a documented referral. Pairs with fewer than 11 shared beneficiaries are suppressed.

CROSS-REFERENCE

Related data on other Healthparse brands

ProviderScore

OIG/SAM exclusion screening, sanctions history

Healthparse Signals

Monitor this provider for changes — dated NPI change events