Nicholas Edward Mahoney
Psychiatry Physician · Oconomowoc, WI
Nicholas Edward Mahoney is a psychiatry physician with a practice address in Oconomowoc, Wisconsin, and NPI 1275929051, issued on Apr 8, 2015. Check the license (Wisconsin 67052 - 21, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Nicholas Edward Mahoney
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- 67052 - 21 WI
Self-reported in NPPES; status is on the state search - Practice location
- 34700 Valley RD, Oconomowoc, WI 53066
- Phone
- (262) 646-4411
- Enumerated
- Apr 8, 2015
- Record last updated
- Mar 21, 2024
- Medicare enrollment
- Enrolled (PECOS I20190829003344); may accept Medicare assignment
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 929 in Wisconsin → Look up another NPI →
Also registered at 34700 Valley RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Melissa Bock, PMHNPPsychiatric/Mental Health Nurse Practitioner1639043094
- Andrew Butchart, D.O.Child & Adolescent Psychiatry Physician1245318229
- Beth Calvert, APNPPsychiatric/Mental Health Nurse Practitioner1477183069
Verify Nicholas Edward Mahoney in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 67052 - 21Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Rogers Memorial Hospital IncorporatedOconomowoc, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nicholas Edward Mahoney among 929 psychiatry physician records in Wisconsin
Nicholas Edward Mahoney is one of 929 psychiatry physician records with a practice address in Wisconsin. 68% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 77% of them.
- NPI issued2015 · 77% of these records are older, 22% newer
- In a Medicare fileYes · 68% of these records are
- In the CMS Doctors and Clinicians fileYes · 47% of these records are
- Graduated2015 · median 2005 among the 439 with a school on file
- Record last updated2024 · 52% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
10 psychiatry physician records list a practice address in Oconomowoc
They are 10 of the 506 NPPES records with a practice address in Oconomowoc, and 929 psychiatry physician records in Wisconsin.
All 929 in Wisconsin → Every provider in Oconomowoc → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Stephen Brennan, MDOconomowoc, WI 530661588168025
- Samuel Hall, MDOconomowoc, WI 530661215497037
- Jerry Halverson, MDOconomowoc, WI 530661952360422
- Elizabeth Hamlin, MDOconomowoc, WI 530661134418981
- Sharon Hirsch, M.D.Oconomowoc, WI 530661730208406
- Kathy Kowalke, MDSummit, WI 530661407800774
- Jody Langford, M.D.Oconomowoc, WI 530661679745640
- Tim Levenhagen, MDOconomowoc, WI 530661962487256
Common questions
What is Nicholas Edward Mahoney's NPI number?
Nicholas Edward Mahoney's National Provider Identifier (NPI) is 1275929051, issued on Apr 8, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Nicholas Edward Mahoney located?
The NPPES record lists a practice address at 34700 Valley RD, Oconomowoc, WI, 53066. Phone: (262) 646-4411. Providers update this record themselves, so call before visiting.
How can I verify Nicholas Edward Mahoney's license?
NPPES lists Wisconsin license number 67052 - 21, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
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.