Brian J. Demaster, MD
Family Medicine Physician · Cedar Grove, WI
Brian J. Demaster, MD is a family medicine physician with a practice address in Cedar Grove, Wisconsin, and NPI 1043325293, issued on Aug 20, 2006. Check the license (Wisconsin 34619, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Brian J. Demaster
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 34619 WI
Self-reported in NPPES; status is on the state search - Practice location
- 313 S Main St, Cedar Grove, WI 53013
- Phone
- (920) 668-8502
- Enumerated
- Aug 20, 2006
- Record last updated
- Mar 7, 2023
- Fax
- (920) 668-8093
- Medicaid ID
- 32539500 WI
- Medicare enrollment
- Enrolled (PECOS I20100609000603); accepts Medicare assignment
- Medical or professional school
- Medical College Of Wisconsin, 1992
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,765 in Wisconsin → Look up another NPI →
Also registered at 313 S Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Allison Soerens, APNPNurse Practitioner1275640484
Verify Brian J. Demaster in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 34619Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.3 times the Medicare Part D claims of the average family medicine physician in 2024
11,688 Medicare Part D claims for 663 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 143 claims were for opioids.
Most prescribed
- Atorvastatin Calcium726 claims
- Amlodipine Besylate499 claims
- Levothyroxine Sodium430 claims
- Furosemide394 claims
- Hydrochlorothiazide333 claims
- Metoprolol Succinate304 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
- Aurora Medical Group, Inc.Milwaukee, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Brian J. Demaster among 3,765 family medicine physician records in Wisconsin
Brian J. Demaster, MD is one of 3,765 family medicine physician records with a practice address in Wisconsin. 75% 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 10% of them.
- NPI issued2006 · 10% of these records are older, 46% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1992 · median 2007 among the 2,347 with a school on file
- Record last updated2023 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
1 family medicine physician record lists a practice address in Cedar Grove
They are 1 of the 13 NPPES records with a practice address in Cedar Grove, and 3,765 family medicine physician records in Wisconsin.
All 3,765 in Wisconsin → Every provider in Cedar Grove → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Andrew Beine, MDChilton, WI 530141194256040
- Christine Bockhorn, MDChilton, WI 530141518951425
- Daniel Duffy, MDCedarburg, WI 530121235191511
- Chee Nou Lee, M.D.Chilton, WI 530141255865697
- Maria Mendoza-Lemes, MDCedarburg, WI 530121598843021
- Donald Meyer, D.O.Cedarburg, WI 530121437124617
- Thomas Shewczyk, MDCedarburg, WI 530121013007046
- Randy Theiler, MDChilton, WI 530141659360808
Common questions
What is Brian J. Demaster, MD's NPI number?
Brian J. Demaster, MD's National Provider Identifier (NPI) is 1043325293, issued on Aug 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Brian J. Demaster, MD located?
The NPPES record lists a practice address at 313 S Main St, Cedar Grove, WI, 53013. Phone: (920) 668-8502. Providers update this record themselves, so call before visiting.
How can I verify Brian J. Demaster, MD's license?
NPPES lists Wisconsin license number 34619, 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.
How much does Brian J. Demaster, MD prescribe under Medicare Part D?
In 2024, Brian J. Demaster, MD had 11,688 Medicare Part D claims for 663 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.