Donald David Nimmer, M.D.
Family Medicine Physician · Greenfield, WI
Donald David Nimmer, M.D. is a family medicine physician with a practice address in Greenfield, Wisconsin, and NPI 1477555951, issued on Aug 13, 2005. Check the license (Wisconsin 29494, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Donald David Nimmer
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 29494 WI
Self-reported in NPPES; status is on the state search - Practice location
- 4600 W Loomis RD, Greenfield, WI 53220
- Phone
- (414) 389-4900
- Enumerated
- Aug 13, 2005
- Record last updated
- Sep 19, 2022
- Fax
- (414) 465-4606
- Medicaid ID
- 31588100 WI
- Medicare enrollment
- Enrolled (PECOS I20080918000676); accepts Medicare assignment
- Medical or professional school
- Medical College Of Wisconsin, 1987
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,765 in Wisconsin → Look up another NPI →
Also registered at 4600 W Loomis RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- James Barton, MDOtolaryngology Physician1447261912
- Sara Bjorklund, PA-CPhysician Assistant1932464088
- Brianne Gebhardt, APNPNurse Practitioner1538714316
- Adam Holt, MDFamily Medicine Physician1649579095
- Kimberly Kocher, PAPhysician Assistant1801202445
- Mimi Kokoska, MDOtolaryngology Physician1770674897
Verify Donald David Nimmer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 29494Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.2 times the Medicare Part D claims of the average family medicine physician in 2024
7,761 Medicare Part D claims for 555 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. 200 claims were for opioids.
Most prescribed
- Atorvastatin Calcium550 claims
- Lisinopril460 claims
- Simvastatin362 claims
- Amlodipine Besylate328 claims
- Hydrochlorothiazide264 claims
- Metformin Hcl Er247 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).
Industry payments in 2024: $24.76
1 payment: food and beverage; the largest payer was Exact Sciences Corporation. The 55,478 providers of this specialty with any payment received $902.55 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Ascension Medical Group-Southeast Wisconsin IncGreenfield, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Donald David Nimmer among 3,765 family medicine physician records in Wisconsin
Donald David Nimmer, M.D. 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 90% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1987 · median 2007 among the 2,347 with a school on file
- Record last updated2022 · 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).
36 family medicine physician records list a practice address in Greenfield
They are 36 of the 961 NPPES records with a practice address in Greenfield, and 3,765 family medicine physician records in Wisconsin.
All 3,765 in Wisconsin → Every provider in Greenfield → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Chihab Bilal, MDMilwaukee, WI 532201275542961
- Nazih Botros, MDMilwaukee, WI 532201700895331
- William Dralle, MDGreenfield, WI 532201679652416
- Katherine Hoyer, MDMilwaukee, WI 532201932214822
- Barbara Hummel, MDGreenfield, WI 532201972519361
- Kathryn Kiyono, MDGreenfield, WI 532201083793954
- Konrad Krawczyk, M.D.Greenfield, WI 532201386619039
- Hany Mikhaeel, MDMilwaukee, WI 532201194773796
Common questions
What is Donald David Nimmer, M.D.'s NPI number?
Donald David Nimmer, M.D.'s National Provider Identifier (NPI) is 1477555951, issued on Aug 13, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Donald David Nimmer, M.D. located?
The NPPES record lists a practice address at 4600 W Loomis RD, Greenfield, WI, 53220. Phone: (414) 389-4900. Providers update this record themselves, so call before visiting.
How can I verify Donald David Nimmer, M.D.'s license?
NPPES lists Wisconsin license number 29494, 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 Donald David Nimmer, M.D. prescribe under Medicare Part D?
In 2024, Donald David Nimmer, M.D. had 7,761 Medicare Part D claims for 555 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is Donald David Nimmer, 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.