Nathan C. Grunwald, MD
Family Medicine Physician · Menasha, WI
Nathan C. Grunwald, MD is a family medicine physician with a practice address in Menasha, Wisconsin, and NPI 1073549887, issued on Jun 23, 2006. Check the license (Wisconsin 47609-020, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Nathan C. Grunwald
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 47609-020 WI
Self-reported in NPPES; status is on the state search - Practice location
- 2005 Midway RD, Menasha, WI 54952
- Phone
- (920) 832-8500
- Enumerated
- Jun 23, 2006
- Record last updated
- Mar 13, 2012 (not updated in 14 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20050114000696); accepts Medicare assignment
- Medical or professional school
- Medical College Of Wisconsin, 2003
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,765 in Wisconsin → Look up another NPI →
Also registered at 2005 Midway RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- John Barkmeier, MDGeriatric Medicine (Family Medicine) Physician1386676062
- Suzanne Bloomhuff, MDFamily Medicine Physician1093744245
- Janine Buffo, MDFamily Medicine Physician1881623049
- Barbara Farb, NPNurse Practitioner1285651307
- Lisa Gunderson, NPNurse Practitioner1558379909
- Gail Helgeson, NPNurse Practitioner1336169473
Verify Nathan C. Grunwald in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 47609-020Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% more Medicare Part D claims than the average family medicine physician in 2024
7,014 Medicare Part D claims for 532 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 120 claims were for opioids.
Most prescribed
- Atorvastatin Calcium797 claims
- Amlodipine Besylate501 claims
- Losartan Potassium291 claims
- Omeprazole245 claims
- Metoprolol Succinate238 claims
- Lisinopril234 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.
Bills Medicare through one group practice
- Thedacare, IncorporatedAppleton, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nathan C. Grunwald among 3,765 family medicine physician records in Wisconsin
Nathan C. Grunwald, MD 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 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 46% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2003 · median 2007 among the 2,347 with a school on file
- Record last updated2012 · 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).
13 family medicine physician records list a practice address in Menasha
They are 13 of the 442 NPPES records with a practice address in Menasha, and 3,765 family medicine physician records in Wisconsin.
All 3,765 in Wisconsin → Every provider in Menasha → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Jeffrey Bastasic, MDMenasha, WI 549521164547600
- Suzanne Bloomhuff, MDMenasha, WI 549521093744245
- Janine Buffo, MDMenasha, WI 549521881623049
- Lawrence Donatelle, MDMenasha, WI 549521871587782
- Gary Heifner, MDMenasha, WI 549521518952928
- Gunmeet Kaleka, MDMenasha, WI 549521285859496
- Cheryl-Lynn Pitre, MDMenasha, WI 549521801881214
- Bryan Roberts, M.D.Menasha, WI 549521275929010
Common questions
What is Nathan C. Grunwald, MD's NPI number?
Nathan C. Grunwald, MD's National Provider Identifier (NPI) is 1073549887, issued on Jun 23, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Nathan C. Grunwald, MD located?
The NPPES record lists a practice address at 2005 Midway RD, Menasha, WI, 54952. Phone: (920) 832-8500. Providers update this record themselves, so call before visiting.
How can I verify Nathan C. Grunwald, MD's license?
NPPES lists Wisconsin license number 47609-020, 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 Nathan C. Grunwald, MD prescribe under Medicare Part D?
In 2024, Nathan C. Grunwald, MD had 7,014 Medicare Part D claims for 532 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.