David William Castellanos, PAC
Medical Physician Assistant · Madison, WI
David William Castellanos, PAC is a medical physician assistant with a practice address in Madison, Wisconsin, and NPI 1295375798, issued on Jan 13, 2020. Check the license (Wisconsin 4822-23, as entered in NPPES) with the Wisconsin board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- David William Castellanos
- Credential
- PAC
- Primary taxonomy
- Medical Physician Assistant 363AM0700X
- License number
- 4822-23 WI
Self-reported in NPPES; status is on the state search - Practice location
- 451 Junction RD, Madison, WI 53717
- Phone
- (608) 265-1600
- Enumerated
- Jan 13, 2020
- Record last updated
- Mar 2, 2022
- Medicare enrollment
- Enrolled (PECOS I20200130000020); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest medical physician assistant records → All 687 in Wisconsin → Look up another NPI →
Also registered at 451 Junction RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify David William Castellanos in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Wisconsin board licenses this profession
Search for license 4822-23Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
19% more Medicare Part D claims than the average medical physician assistant in 2024
1,362 Medicare Part D claims for 389 beneficiaries, against an average of 1,148 among the 23,801 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 23 claims were for opioids.
Most prescribed
- Atorvastatin Calcium87 claims
- Amlodipine Besylate76 claims
- Lisinopril69 claims
- Levothyroxine Sodium53 claims
- Losartan Potassium49 claims
- Omeprazole44 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.
Bills Medicare through one group practice
- University OF Wisconsin Medical Foundation IncMadison, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
David William Castellanos among 687 medical physician assistant records in Wisconsin
David William Castellanos, PAC is one of 687 medical physician assistant records with a practice address in Wisconsin. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 73% of them.
- NPI issued2020 · 73% of these records are older, 22% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated2019 · median 2016 among the 479 with a school on file
- Record last updated2022 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363AM0700X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
208 medical physician assistant records list a practice address in Madison
They are 208 of the 15,014 NPPES records with a practice address in Madison, and 687 medical physician assistant records in Wisconsin.
All 687 in Wisconsin → Every provider in Madison → Medical Physician Assistant nationwide →
The 8 medical physician assistant records with the nearest ZIP codes
- Shandra Bauer, PAMadison, WI 537171811282213
- Laura Berkner, PA-CMadison, WI 537171790048056
- Mary Evenson, PA-CMadison, WI 537171659366565
- Beverly Grooms-Thom, PA CMadison, WI 537171700853314
- Sally-Ann Johannsen, PAMadison, WI 537171639234610
- Renee Knutson, PA-CMadison, WI 537171730137548
- Leslie Liegel, PACMadison, WI 537171922084649
- Jane Mooney, PA-CMadison, WI 537171760535140
Common questions
What is David William Castellanos, PAC's NPI number?
David William Castellanos, PAC's National Provider Identifier (NPI) is 1295375798, issued on Jan 13, 2020. An NPI identifies a provider in billing; it is not a license.
Where is David William Castellanos, PAC located?
The NPPES record lists a practice address at 451 Junction RD, Madison, WI, 53717. Phone: (608) 265-1600. Providers update this record themselves, so call before visiting.
How can I verify David William Castellanos, PAC's license?
NPPES lists Wisconsin license number 4822-23, as entered by the provider. Search the Wisconsin board that licenses this profession; the NPPES record confirms identity only.
How much does David William Castellanos, PAC prescribe under Medicare Part D?
In 2024, David William Castellanos, PAC had 1,362 Medicare Part D claims for 389 beneficiaries; the average among medical physician assistant prescribers was 1,148. Part D covers Medicare prescriptions only.
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.