Gregory N. Geissinger, PAC
Physician Assistant · Marshfield, WI
Gregory N. Geissinger, PAC is a physician assistant with a practice address in Marshfield, Wisconsin, and NPI 1699882969, issued on Aug 24, 2006. Check the license (Wisconsin 1225, as entered in NPPES) with the Wisconsin board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Gregory N. Geissinger
- Credential
- PAC
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- 1225 WI
Self-reported in NPPES; status is on the state search - Practice location
- 1000 N Oak Ave, Marshfield, WI 54449
- Phone
- (715) 387-5297
- Enumerated
- Aug 24, 2006
- Record last updated
- Nov 17, 2022
- Medicaid ID
- 42996700 WI
- Medicare enrollment
- Enrolled (PECOS I20110210001156); accepts Medicare assignment
- Entity
- Type 1 · individual
Also registered at 1000 N Oak Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sheetal Aatrai, MDInternal Medicine Physician1417568965
- Sukaina AbbasPediatrics Physician1407529191
- Chady Abboud Leon, M.D.Hematology & Oncology Physician1770737744
- Ihab Abdalrahman, MDHospitalist Physician1497855134
- Raquel Abengozar Mingorance, MDStudent in an Organized Health Care Education/Training Program1609437755
- Aanuoluwa Abiola, M.DGeriatric Medicine (Internal Medicine) Physician1598117574
Verify Gregory N. Geissinger in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Wisconsin board licenses this profession
Search for license 1225Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average physician assistant in 2024
30 Medicare Part D claims for 20 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims. 16 claims were for opioids.
Most prescribed
- Oxycodone Hcl12 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 78.9 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through 2 group practices
- Aspirus Medical Group, Inc.Wausau, WI
- Mchs Hospitals IncMarshfield, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
56 physician assistant records list a practice address in Marshfield
They are 56 of the 1,360 NPPES records with a practice address in Marshfield, and 3,475 physician assistant records in Wisconsin.
All 56 in Marshfield → All 3,475 in Wisconsin → Every provider in Marshfield →
Other physician assistant records in Wisconsin
- Amber Abraham, PA-CGreen Bay, WI1598993297
- Roopa AchuriNeenah, WI1225531635
- Carleen Acker, PA-CMadison, WI1447514773
- Lauren Ackerman, PA-CCudahy, WI1992357982
- Jocelyn Acompanado, PA-CSheboygan, WI1770521486
- Kora Adam, PA-CBurlington, WI1952666554
- Stephanie Adamczyk, PAMilwaukee, WI1063007441
- Kristen Adamo, PANew Berlin, WI1437179520
- Beth Adams, PA-CMequon, WI1801237540
- Eric Adams, PAGreen Bay, WI1528445087
Common questions
What is Gregory N. Geissinger, PAC's NPI number?
Gregory N. Geissinger, PAC's National Provider Identifier (NPI) is 1699882969, issued on Aug 24, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory N. Geissinger, PAC located?
The NPPES record lists a practice address at 1000 N Oak Ave, Marshfield, WI, 54449. Phone: (715) 387-5297. Providers update this record themselves, so call before visiting.
How can I verify Gregory N. Geissinger, PAC's license?
NPPES lists Wisconsin license number 1225, as entered by the provider. Search the Wisconsin board that licenses this profession; the NPPES record confirms identity only.
How much does Gregory N. Geissinger, PAC prescribe under Medicare Part D?
In 2024, Gregory N. Geissinger, PAC had 30 Medicare Part D claims for 20 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
What is Gregory N. Geissinger, PAC's MIPS final score?
The 2023 MIPS final score is 78.9 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.