John Claus Marxen, LPC
Mental Health Counselor · Oshkosh, WI
John Claus Marxen, LPC is a mental health counselor with a practice address in Oshkosh, Wisconsin, and NPI 1932340437, issued on Mar 12, 2009. Check the license (Wisconsin 3020-125, as entered in NPPES) with the Wisconsin board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- John Claus Marxen
- Credential
- LPC
- Primary taxonomy
- Mental Health Counselor 101YM0800X
- License number
- 3020-125 WI
Self-reported in NPPES; status is on the state search - Practice location
- 3126 W 20TH Ave, Oshkosh, WI 54904
- Phone
- (920) 279-6001
- Enumerated
- Mar 12, 2009
- Record last updated
- Mar 12, 2009 (not updated in 17 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest mental health counselor records → All 2,622 in Wisconsin → Look up another NPI →
Verify John Claus Marxen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Wisconsin board licenses this profession
Search for license 3020-125Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
John Claus Marxen among 2,622 mental health counselor records in Wisconsin
John Claus Marxen, LPC is one of 2,622 mental health counselor records with a practice address in Wisconsin. 11% 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 2009, is newer than 16% of them.
- NPI issued2009 · 16% of these records are older, 80% newer
- In a Medicare fileNo · 11% of these records are
- In the CMS Doctors and Clinicians fileNo · 15% of these records are
- Record last updated2009 · 43% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 101YM0800X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
24 mental health counselor records list a practice address in Oshkosh
They are 24 of the 1,527 NPPES records with a practice address in Oshkosh, and 2,622 mental health counselor records in Wisconsin. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 2,622 in Wisconsin → Every provider in Oshkosh → Mental Health Counselor nationwide →
The 8 mental health counselor records with the nearest ZIP codes
- Heidi BalkeOshkosh, WI 549041033310594
- Cheryl EiflerOshkosh, WI 549041285835751
- Amysue Hartman, MAOshkosh, WI 549041568747475
- Kristin Havel, LPCOshkosh, WI 549041376314500
- Emily HerzfeldtOshkosh, WI 549041013608314
- Stephanie RichardsOshkosh, WI 549041376434092
- Thomas Schuller, LPCOshkosh, WI 549041447455050
- Paula Harry, LCSWOshkosh, WI 549021528169034
Common questions
What is John Claus Marxen, LPC's NPI number?
John Claus Marxen, LPC's National Provider Identifier (NPI) is 1932340437, issued on Mar 12, 2009. An NPI identifies a provider in billing; it is not a license.
Where is John Claus Marxen, LPC located?
The NPPES record lists a practice address at 3126 W 20TH Ave, Oshkosh, WI, 54904. Phone: (920) 279-6001. Providers update this record themselves, so call before visiting.
How can I verify John Claus Marxen, LPC's license?
NPPES lists Wisconsin license number 3020-125, as entered by the provider. Search the Wisconsin board that licenses this profession; the NPPES record confirms identity 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. 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.