Mary J. Derse-Hayes, P.A.
Physician Assistant · Milwaukee, WI
Mary J. Derse-Hayes, P.A. is a physician assistant with a practice address in Milwaukee, Wisconsin, and NPI 1679675557, issued on Sep 2, 2006. Check the license (Wisconsin 2046, as entered in NPPES) with the Wisconsin board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mary J. Derse-Hayes
- Credential
- P.A.
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- 2046 WI
Self-reported in NPPES; status is on the state search - Practice location
- 2350 N Lake Dr, Milwaukee, WI 53211
- Phone
- (414) 298-7104
- Enumerated
- Sep 2, 2006
- Record last updated
- Nov 9, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (414) 298-7117
- Medicaid ID
- 1679675557 WI
- Medicare enrollment
- Enrolled (PECOS I20061208000034); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 3,475 in Wisconsin → Look up another NPI →
Also registered at 2350 N Lake Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Allen Babbitz, MDObstetrics & Gynecology Physician1326022849
- Catherine Bares, APNPNurse Practitioner1104285873
- Heather Bastjan, FNPFamily Nurse Practitioner1578921375
- Katelyn Behring, PA-CPhysician Assistant1902239403
- Jonathan Berkoff, MDObstetrics & Gynecology Physician1679623326
- Vanessa BravoOccupational Therapist1235020280
Verify Mary J. Derse-Hayes in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Wisconsin board licenses this profession
Search for license 2046Check 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% fewer Medicare Part D claims than the average physician assistant in 2024
111 Medicare Part D claims for 80 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims.
Most prescribed
- Methylprednisolone12 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
- Froedtert Andthe Medical College OF Wisconsin Community Physicians IncWauwatosa, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mary J. Derse-Hayes among 3,475 physician assistant records in Wisconsin
Mary J. Derse-Hayes, P.A. 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 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 76% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2006 · median 2016 among the 2,491 with a school on file
- Record last updated2016 · 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).
821 physician assistant records list a practice address in Milwaukee
They are 821 of the 18,389 NPPES records with a practice address in Milwaukee, and 3,475 physician assistant records in Wisconsin.
All 3,475 in Wisconsin → Every provider in Milwaukee → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Katelyn Behring, PA-CMilwaukee, WI 532111902239403
- Daniel Chadwick, PA-CMilwaukee, WI 532111336785500
- Maggie GierahnMilwaukee, WI 532111447746896
- Ashley Henning, PA-CMilwaukee, WI 532111194355784
- Kelly Isherwood, PA-CMilwaukee, WI 532111043312937
- Kathryn Kasper, MPAS, PA-CMilwaukee, WI 532111902457575
- Michael Lawrence, PAMilwaukee, WI 532111992790505
- Dylan Menefee, PA-CMilwaukee, WI 532111326650698
Common questions
What is Mary J. Derse-Hayes, P.A.'s NPI number?
Mary J. Derse-Hayes, P.A.'s National Provider Identifier (NPI) is 1679675557, issued on Sep 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mary J. Derse-Hayes, P.A. located?
The NPPES record lists a practice address at 2350 N Lake Dr, Milwaukee, WI, 53211. Phone: (414) 298-7104. Providers update this record themselves, so call before visiting.
How can I verify Mary J. Derse-Hayes, P.A.'s license?
NPPES lists Wisconsin license number 2046, as entered by the provider. Search the Wisconsin board that licenses this profession; the NPPES record confirms identity only.
How much does Mary J. Derse-Hayes, P.A. prescribe under Medicare Part D?
In 2024, Mary J. Derse-Hayes, P.A. had 111 Medicare Part D claims for 80 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.