Douglas Marx, D.O.
Family Medicine Physician · Germantown, WI
Douglas Marx, D.O. is a family medicine physician with a practice address in Germantown, Wisconsin, and NPI 1326011321, issued on Feb 9, 2006. Check the license (Wisconsin 40581, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Douglas Marx
- Credential
- D.O.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 40581 WI
Self-reported in NPPES; status is on the state search - Practice location
- W168N11237 Western Ave, Germantown, WI 53022
- Phone
- (262) 253-5060
- Enumerated
- Feb 9, 2006
- Record last updated
- Feb 3, 2014 (not updated in 12 years: call before relying on the address or phone)
- Medicaid ID
- 30096200 WV
- Medicare enrollment
- Enrolled (PECOS I20100421000863); accepts Medicare assignment
- Medical or professional school
- Midwestern University, Chicago College Of Osteopathic Med, 1997
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,765 in Wisconsin → Look up another NPI →
Also registered at W168N11237 Western Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Alvin Cardona, MDFamily Medicine Physician1174016935
- Wyatt Chicoine, DOFamily Medicine Physician1124760202
- Cathleen Dixon, PTPhysical Therapist1407182967
- Jessica Ewig, APNPNurse Practitioner1275919417
- Joseph Hylander, MDHospitalist Physician1669933826
- Ellie KahlePhysician Assistant1750089736
Verify Douglas Marx in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 40581Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
25% more Medicare Part D claims than the average family medicine physician in 2024
4,421 Medicare Part D claims for 737 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. 43 claims were for opioids.
Most prescribed
- Atorvastatin Calcium310 claims
- Lisinopril249 claims
- Amlodipine Besylate206 claims
- Levothyroxine Sodium185 claims
- Pravastatin Sodium179 claims
- Simvastatin168 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
- Prohealth Medical Group IncWaukesha, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Douglas Marx among 3,765 family medicine physician records in Wisconsin
Douglas Marx, D.O. 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
- Graduated1997 · median 2007 among the 2,347 with a school on file
- Record last updated2014 · 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).
17 family medicine physician records list a practice address in Germantown
They are 17 of the 329 NPPES records with a practice address in Germantown, and 3,765 family medicine physician records in Wisconsin.
All 3,765 in Wisconsin → Every provider in Germantown → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Tarek Amin, D.O.Germantown, WI 530221710322789
- Bruce Boyd, MDGermantown, WI 530221629000864
- Alvin Cardona, MDGermantown, WI 530221174016935
- Latosha Harper, MD, DPT, MPT, ATCGermantown, WI 530221528204153
- David Imse, M.D.Germantown, WI 530221376516450
- Andrew Knoernschild, M.D.Germantown, WI 530221467425454
- Adrienne Maurer, MDGermantown, WI 530221073567939
- Amy Miller, M.D.Germantown, WI 530221689648933
Common questions
What is Douglas Marx, D.O.'s NPI number?
Douglas Marx, D.O.'s National Provider Identifier (NPI) is 1326011321, issued on Feb 9, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Douglas Marx, D.O. located?
The NPPES record lists a practice address at W168N11237 Western Ave, Germantown, WI, 53022. Phone: (262) 253-5060. Providers update this record themselves, so call before visiting.
How can I verify Douglas Marx, D.O.'s license?
NPPES lists Wisconsin license number 40581, 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 Douglas Marx, D.O. prescribe under Medicare Part D?
In 2024, Douglas Marx, D.O. had 4,421 Medicare Part D claims for 737 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.