James P. Gierahn, M.D.
Geriatric Medicine (Internal Medicine) Physician · Racine, WI
James P. Gierahn, M.D. is a geriatric medicine (internal medicine) physician with a practice address in Racine, Wisconsin, and NPI 1306870696, issued on Jul 10, 2006. Check the license (Wisconsin 21389, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- James P. Gierahn
- Credential
- M.D.
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License number
- 21389 WI
Self-reported in NPPES; status is on the state search - Practice location
- 1 Main St, Racine, WI 53403
- Phone
- (262) 687-6100
- Enumerated
- Jul 10, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 110 in Wisconsin → Look up another NPI →
Also registered at 1 Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Judith Bagley, N.P.Adult Health Nurse Practitioner1063446482
- Suzanne Cooper, N.P.Gerontology Nurse Practitioner1952335317
- Susan Nosalik, NPNurse Practitioner1669496063
- Daniel Ross, M.D.Internal Medicine Physician1982628855
- Gerald Wisniewski, MDInternal Medicine Physician1164432647
Verify James P. Gierahn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 21389Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.3 times the Medicare Part D claims of the average geriatric medicine (internal medicine) physician in 2024
9,782 Medicare Part D claims for 567 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. Brand-name drugs were 20% of claims. 183 claims were for opioids.
Most prescribed
- Atorvastatin Calcium642 claims
- Furosemide506 claims
- Amlodipine Besylate434 claims
- Levothyroxine Sodium374 claims
- Lisinopril287 claims
- Gabapentin258 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): 82.4 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).
James P. Gierahn among 110 geriatric medicine (internal medicine) physician records in Wisconsin
James P. Gierahn, M.D. is one of 110 geriatric medicine (internal medicine) physician records with a practice address in Wisconsin. 76% 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 5% of them.
- NPI issued2006 · 5% of these records are older, 46% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- Record last updated2007 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Internal Medicine) Physician providers in Wisconsin
There are 110 geriatric medicine (internal medicine) physician records in Wisconsin.
All 110 in Wisconsin → Every provider in Racine → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- Moustafa Elziny, MBBCHMount Pleasant, WI 534051164198420
- Edith Burns, M.D.Milwaukee, WI 532951760406573
- Kathryn Denson, MDMilwaukee, WI 532951629029152
- Cory Ganshert, DOMilwaukee, WI 532951295268159
- Kirk Nelson, M.D.Milwaukee, WI 532951851311740
- Ahmet Demircioglu, M.D.St Francis, WI 532351114005642
- Leyla Solis, MDSaint Francis, WI 532351659459188
- Omair Ahmed, MBBS, MDMilwaukee, WI 532331699417972
Common questions
What is James P. Gierahn, M.D.'s NPI number?
James P. Gierahn, M.D.'s National Provider Identifier (NPI) is 1306870696, issued on Jul 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is James P. Gierahn, M.D. located?
The NPPES record lists a practice address at 1 Main St, Racine, WI, 53403. Phone: (262) 687-6100. Providers update this record themselves, so call before visiting.
How can I verify James P. Gierahn, M.D.'s license?
NPPES lists Wisconsin license number 21389, 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 James P. Gierahn, M.D. prescribe under Medicare Part D?
In 2024, James P. Gierahn, M.D. had 9,782 Medicare Part D claims for 567 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. Part D covers Medicare prescriptions only.
What is James P. Gierahn, M.D.'s MIPS final score?
The 2023 MIPS final score is 82.4 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.