Ralph D. Wertwijn, MD
Internal Medicine Physician · Owatonna, MN
Ralph D. Wertwijn, MD is an internal medicine physician with a practice address in Owatonna, Minnesota, and NPI 1538129283, issued on Mar 26, 2006. Check the license (Minnesota 30544, as entered in NPPES) on the Minnesota Board of Medical Practice; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Ralph D. Wertwijn
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 30544 MN
Self-reported in NPPES; status is on the state search - Practice location
- 2023 Linn Dr, Owatonna, MN 55060
- Phone
- (507) 455-0067
- Enumerated
- Mar 26, 2006
- Record last updated
- Sep 22, 2010 (not updated in 16 years: call before relying on the address or phone)
- Medicaid ID
- 491383300 MN
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,632 in Minnesota → Look up another NPI →
Verify Ralph D. Wertwijn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMinnesota Board of Medical Practice
Search for license 30544Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Ralph D. Wertwijn among 2,632 internal medicine physician records in Minnesota
Ralph D. Wertwijn, MD is one of 2,632 internal medicine physician records with a practice address in Minnesota. 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 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 58% newer
- In a Medicare fileNo · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 65% of these records are
- Record last updated2010 · 57% 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 Minnesota practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
7 internal medicine physician records list a practice address in Owatonna
They are 7 of the 486 NPPES records with a practice address in Owatonna, and 2,632 internal medicine physician records in Minnesota. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 2,632 in Minnesota → Every provider in Owatonna → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Megan Anthony, DOOwatonna, MN 550601972130847
- Sarah Gantert, MDOwatonna, MN 550601992765648
- Harold Hellweg, D.O.Owatonna, MN 550601790071231
- Jean Lenz, M.D.Owatonna, MN 550601588044051
- Charles Sandhofer, MDOwatonna, MN 550601053372268
- Carol Winter, MDOwatonna, MN 550601871554089
- Muna AlhusbanNorthfield, MN 550571215513148
- Nidhi Gupta, MDPine City, MN 550631336338433
Common questions
What is Ralph D. Wertwijn, MD's NPI number?
Ralph D. Wertwijn, MD's National Provider Identifier (NPI) is 1538129283, issued on Mar 26, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ralph D. Wertwijn, MD located?
The NPPES record lists a practice address at 2023 Linn Dr, Owatonna, MN, 55060. Phone: (507) 455-0067. Providers update this record themselves, so call before visiting.
How can I verify Ralph D. Wertwijn, MD's license?
NPPES lists Minnesota license number 30544, as entered by the provider. Search the Minnesota Board of Medical Practice at https://mn.gov/boards/medical-practice/. 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.