Catherine Willenborg, PAC
Physician Assistant · Scottsdale, AZ
Catherine Willenborg, PAC is a physician assistant with a practice address in Scottsdale, Arizona, and NPI 1154389153, issued on May 2, 2006. Check the license (Arizona 10627, as entered in NPPES) with the Arizona board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Catherine Willenborg
- Credential
- PAC
- Primary taxonomy
- Physician Assistant 363A00000X
- License numbers
- 10627 AZ
PA972 NV
Self-reported in NPPES; status is on the state search - Practice location
- 13400 E Shea Blvd, Scottsdale, AZ 85259
- Phone
- (480) 301-8000
- Enumerated
- May 2, 2006
- Record last updated
- Aug 6, 2025
- Medicare enrollment
- Enrolled (PECOS I20160315000643); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 3,666 in Arizona → Look up another NPI →
Also registered at 13400 E Shea Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Catherine Willenborg in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Arizona board licenses this profession
Search for license 10627Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average physician assistant in 2024
58 Medicare Part D claims for 26 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. 15 claims were for opioids.
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: $31.99
1 payment: food and beverage; the largest payer was Merck Sharp & Dohme LLC. The 64,719 providers of this specialty with any payment received $841.65 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.
Bills Medicare through 2 group practices
- Adventist Health Physicians NetworkSaint Helena, CA
- Mayo Clinic ArizonaScottsdale, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Catherine Willenborg among 3,666 physician assistant records in Arizona
Catherine Willenborg, PAC is one of 3,666 physician assistant records with a practice address in Arizona. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 3% of them.
- NPI issued2006 · 3% of these records are older, 84% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2005 · median 2018 among the 2,207 with a school on file
- Record last updated2025 · 35% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
416 physician assistant records list a practice address in Scottsdale
They are 416 of the 11,008 NPPES records with a practice address in Scottsdale, and 3,666 physician assistant records in Arizona.
All 3,666 in Arizona → Every provider in Scottsdale → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Diane Childers-Watson, P.A.Scottsdale, AZ 852591114983079
- Robin Cremer, P.A.-C.Scottsdale, AZ 852591467434852
- Mary Cross, P.A.-C.Scottsdale, AZ 852591902889132
- Lori Decook, PA-CScottsdale, AZ 852591750358636
- Koryn Kayler-Bucich, PA-CScottsdale, AZ 852591528045689
- Susan Lemens, PA-CScottsdale, AZ 852591982687323
- Sarah Nevsimal, PAScottsdale, AZ 852591346244753
- Joan Reynolds, P.A.-C.Scottsdale, AZ 852591629051883
Common questions
What is Catherine Willenborg, PAC's NPI number?
Catherine Willenborg, PAC's National Provider Identifier (NPI) is 1154389153, issued on May 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Catherine Willenborg, PAC located?
The NPPES record lists a practice address at 13400 E Shea Blvd, Scottsdale, AZ, 85259. Phone: (480) 301-8000. Providers update this record themselves, so call before visiting.
How can I verify Catherine Willenborg, PAC's license?
NPPES lists Arizona license number 10627, as entered by the provider. Search the Arizona board that licenses this profession; the NPPES record confirms identity only.
How much does Catherine Willenborg, PAC prescribe under Medicare Part D?
In 2024, Catherine Willenborg, PAC had 58 Medicare Part D claims for 26 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
What is Catherine Willenborg, PAC'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.