Mason Nelson
Physician Assistant · Oconomowoc, WI
Mason Nelson is a physician assistant with a practice address in Oconomowoc, Wisconsin, and NPI 1275233728, issued on Mar 3, 2023. Check the license (Wisconsin 7511, as entered in NPPES) with the Wisconsin board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mason Nelson
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- 7511 WI
Self-reported in NPPES; status is on the state search - Practice location
- 1417 Altis Dr Unit 207, Oconomowoc, WI 53066
- Phone
- (218) 530-0035
- Enumerated
- Mar 3, 2023
- Record last updated
- Apr 16, 2026
- Medicaid ID
- 100253607 WI
- Medicare enrollment
- Enrolled (PECOS I20231018002880); may accept Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 3,475 in Wisconsin → Look up another NPI →
Verify Mason Nelson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Wisconsin board licenses this profession
Search for license 7511Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average physician assistant in 2024
77 Medicare Part D claims for 60 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. 57 claims were for opioids.
Most prescribed
- Acetaminophen-Codeine22 claims
- Hydrocodone-Acetaminophen18 claims
- Oxycodone Hcl14 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.
Mason Nelson among 3,475 physician assistant records in Wisconsin
Mason Nelson is one of 3,475 physician assistant records with a practice address in Wisconsin. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2023, is newer than 86% of them.
- NPI issued2023 · 86% of these records are older, 10% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2023 · median 2016 among the 2,491 with a school on file
- Record last updated2026 · 38% 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 Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
16 physician assistant records list a practice address in Oconomowoc
They are 16 of the 506 NPPES records with a practice address in Oconomowoc, and 3,475 physician assistant records in Wisconsin.
All 3,475 in Wisconsin → Every provider in Oconomowoc → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Elana Contorno, PA-CSummit, WI 530661295750479
- Eric Elliot, DMSC, PA-COconomowoc, WI 530661508825605
- Sandra Hansen, PA-CSummit, WI 530661174565170
- Adam Kelly, PASummit, WI 530661891974218
- Catherine Keulks-Torinus, P.A.C.Oconomowoc, WI 530661114903481
- Nicole Kujawa, PAOconomowoc, WI 530661174628341
- Wanda Marquart, PACSummit, WI 530661669420816
- Nancy Matthews, P.A.Oconomowoc, WI 530661649256686
Common questions
What is Mason Nelson's NPI number?
Mason Nelson's National Provider Identifier (NPI) is 1275233728, issued on Mar 3, 2023. An NPI identifies a provider in billing; it is not a license.
Where is Mason Nelson located?
The NPPES record lists a practice address at 1417 Altis Dr Unit 207, Oconomowoc, WI, 53066. Phone: (218) 530-0035. Providers update this record themselves, so call before visiting.
How can I verify Mason Nelson's license?
NPPES lists Wisconsin license number 7511, as entered by the provider. Search the Wisconsin board that licenses this profession; the NPPES record confirms identity only.
How much does Mason Nelson prescribe under Medicare Part D?
In 2024, Mason Nelson had 77 Medicare Part D claims for 60 beneficiaries; the average among physician assistant prescribers was 830. 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.