Mark A. Grunwald, MD
Family Medicine Physician · Prairie Du Chien, WI
Mark A. Grunwald, MD is a family medicine physician with a practice address in Prairie Du Chien, Wisconsin, and NPI 1336144914, issued on Jun 20, 2005. Check the license (Wisconsin 23439, as entered in NPPES) on the Wisconsin Medical Examining Board; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Mark A. Grunwald
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 23439 WI
Self-reported in NPPES; status is on the state search - Practice location
- 304 S Jackson St, Prairie Du Chien, WI 53821
- Phone
- (608) 326-5459
- Enumerated
- Jun 20, 2005
- Record last updated
- Apr 9, 2008 (not updated in 18 years: call before relying on the address or phone)
- Medicaid ID
- 30483400 WI
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,765 in Wisconsin → Look up another NPI →
Also registered at 304 S Jackson St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ann Grunwald, MDFamily Medicine Physician1174528756
Verify Mark A. Grunwald in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 23439Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Mark A. Grunwald among 3,765 family medicine physician records in Wisconsin
Mark A. 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 not. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 90% newer
- In a Medicare fileNo · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2008 · 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).
15 family medicine physician records list a practice address in Prairie Du Chien
They are 15 of the 150 NPPES records with a practice address in Prairie Du Chien, and 3,765 family medicine physician records in Wisconsin. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 3,765 in Wisconsin → Every provider in Prairie Du Chien → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Stacy Blackburn, D.O.Prairie Du Chien, WI 538211952551525
- Walter Boisvert, MDPrairie Du Chien, WI 538211003810821
- David Dehart, MDPrairie Du Chien, WI 538211912997438
- Evelyn Frederick, DOPrairie Du Chien, WI 538211790487700
- Ann Grunwald, MDPrairie Du Chien, WI 538211174528756
- James Jordan, MDPrairie Du Chien, WI 538211811962574
- Kurt Jorgensen, MDPrairie Du Chien, WI 538211467458844
- Robert Key, MDPrairie Du Chien, WI 538211801886312
Common questions
What is Mark A. Grunwald, MD's NPI number?
Mark A. Grunwald, MD's National Provider Identifier (NPI) is 1336144914, issued on Jun 20, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Mark A. Grunwald, MD located?
The NPPES record lists a practice address at 304 S Jackson St, Prairie Du Chien, WI, 53821. Phone: (608) 326-5459. Providers update this record themselves, so call before visiting.
How can I verify Mark A. Grunwald, MD's license?
NPPES lists Wisconsin license number 23439, 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.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.