Brett J. Guernsey, RPH
Pharmacist · Green Bay, WI
Brett J. Guernsey, RPH is a pharmacist with a practice address in Green Bay, Wisconsin, and NPI 1124452891, issued on Aug 29, 2013. Check the license (Wisconsin 11823-40, as entered in NPPES) with the Wisconsin board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Brett J. Guernsey
- Credential
- RPH
- Primary taxonomy
- Pharmacist 183500000X
- License numbers
- 11823-40 WI
5302026803 MI
Self-reported in NPPES; status is on the state search - Practice location
- 301 Bay Park Square, Green Bay, WI 54304
- Phone
- (920) 499-5889
- Enumerated
- Aug 29, 2013
- Record last updated
- Aug 29, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (920) 499-3718
- Entity
- Type 1 · individual
8 nearest pharmacist records → All 5,397 in Wisconsin → Look up another NPI →
Also registered at 301 Bay Park Square
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Craig Keller, O.D.Optometrist1780971499
- Esther Richter, NPFamily Nurse Practitioner1346640778
- Kathryn Treml, APNPNurse Practitioner1194271312
Verify Brett J. Guernsey in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Wisconsin board licenses this profession
Search for license 11823-40Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Most of these Medicare Part D claims are vaccines, 100% of the cost of the top drugs
30 Medicare Part D claims for 29 beneficiaries, against an average of 119 among the 28,524 providers of this specialty who prescribed in Part D. Brand-name drugs were 100% of claims.
Most prescribed
Pharmacies often give vaccines under a standing order that names one clinician, and CMS counts every such claim under that clinician's NPI. These claims are therefore not a measure of this clinician's own prescribing.
- Abrysvo17 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.
Brett J. Guernsey among 5,397 pharmacist records in Wisconsin
Brett J. Guernsey, RPH is one of 5,397 pharmacist records with a practice address in Wisconsin. 16% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 41% of them.
- NPI issued2013 · 41% of these records are older, 52% newer
- In a Medicare fileYes · 16% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2013 · 78% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 183500000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
155 pharmacist records list a practice address in Green Bay
They are 155 of the 4,619 NPPES records with a practice address in Green Bay, and 5,397 pharmacist records in Wisconsin.
All 5,397 in Wisconsin → Every provider in Green Bay → Pharmacist nationwide →
The 8 pharmacist records with the nearest ZIP codes
- Robert Atkinson, RPHGreen Bay, WI 543041871707141
- Alisyn Baciak, PHARM.D.Green Bay, WI 543041558615047
- Gregory Barnes, RPHGreen Bay, WI 543041598040669
- Deborah BarnesGreen Bay, WI 543041063760932
- Brennan Beck, PHARMDGreen Bay, WI 543041922377001
- Christian Bialk, PHARMDGreen Bay, WI 543041114350527
- Lisa FehrenbachGreen Bay, WI 543041306121348
- Daniel Gustin, PHARM DGreen Bay, WI 543041497061352
Common questions
What is Brett J. Guernsey, RPH's NPI number?
Brett J. Guernsey, RPH's National Provider Identifier (NPI) is 1124452891, issued on Aug 29, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Brett J. Guernsey, RPH located?
The NPPES record lists a practice address at 301 Bay Park Square, Green Bay, WI, 54304. Phone: (920) 499-5889. Providers update this record themselves, so call before visiting.
How can I verify Brett J. Guernsey, RPH's license?
NPPES lists Wisconsin license number 11823-40, as entered by the provider. Search the Wisconsin board that licenses this profession; the NPPES record confirms identity only.
How much does Brett J. Guernsey, RPH prescribe under Medicare Part D?
In 2024, Brett J. Guernsey, RPH had 30 Medicare Part D claims for 29 beneficiaries; the average among pharmacist prescribers was 119. 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.