Eammon Grosek
Internal Medicine Physician · Marshfield, WI
Eammon Grosek is an internal medicine physician with a practice address in Marshfield, Wisconsin, and NPI 1154855732, issued on Apr 20, 2017. Check the license (Wisconsin 6523, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Eammon Grosek
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 6523 WI
Self-reported in NPPES; status is on the state search - Practice location
- 1000 N Oak Ave, Marshfield, WI 54449
- Phone
- (719) 649-0232
- Enumerated
- Apr 20, 2017
- Record last updated
- Apr 20, 2017 (not updated in 9 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20200930001439); accepts Medicare assignment
- Medical or professional school
- Sanford School Of Medicine Of University Of South Dakota, 2016
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,078 in Wisconsin → Look up another NPI →
Also registered at 1000 N Oak Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Raquel Abengozar Mingorance, MDStudent in an Organized Health Care Education/Training Program1609437755
- Aanuoluwa Abiola, M.DGeriatric Medicine (Internal Medicine) Physician1598117574
Verify Eammon Grosek in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 6523Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.5 times the Medicare Part D claims of the average internal medicine physician in 2024
10,965 Medicare Part D claims for 673 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 395 claims were for opioids.
Most prescribed
- Atorvastatin Calcium479 claims
- Levothyroxine Sodium346 claims
- Rosuvastatin Calcium338 claims
- Amlodipine Besylate310 claims
- Losartan Potassium306 claims
- Metoprolol Succinate294 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 MIPS final score for 2023 (Medicare payment program): 97.6 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Monument Health Rapid City Hospital IncRapid City, SD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Eammon Grosek among 2,078 internal medicine physician records in Wisconsin
Eammon Grosek is one of 2,078 internal medicine physician records with a practice address in Wisconsin. 70% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2017, is newer than 77% of them.
- NPI issued2017 · 77% of these records are older, 21% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2016 · median 2002 among the 1,098 with a school on file
- Record last updated2017 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
62 internal medicine physician records list a practice address in Marshfield
They are 62 of the 1,360 NPPES records with a practice address in Marshfield, and 2,078 internal medicine physician records in Wisconsin.
All 2,078 in Wisconsin → Every provider in Marshfield → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Linda Daly-Oneill, MDMarshfield, WI 544491366550386
- Gaojun Gui, MDMarshfield, WI 544491568570828
- Tula Haldes, MDMarshfield, WI 544491942318969
- Muhammad Haleem, MDMarshfield, WI 544491275544546
- Renee Hoynacke, MDMarshfield, WI 544491821106832
- Ewa Kubica, MDMarshfield, WI 544491942318951
- Urszula Moldysz, MDMarshfield, WI 544491538279682
- Douglas Peterson, MDMarshfield, WI 544491437267440
Common questions
What is Eammon Grosek's NPI number?
Eammon Grosek's National Provider Identifier (NPI) is 1154855732, issued on Apr 20, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Eammon Grosek located?
The NPPES record lists a practice address at 1000 N Oak Ave, Marshfield, WI, 54449. Phone: (719) 649-0232. Providers update this record themselves, so call before visiting.
How can I verify Eammon Grosek's license?
NPPES lists Wisconsin license number 6523, 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 Eammon Grosek prescribe under Medicare Part D?
In 2024, Eammon Grosek had 10,965 Medicare Part D claims for 673 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Eammon Grosek's MIPS final score?
The 2023 MIPS final score is 97.6 of 100. 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.