Douglas Marx, D.O.
NPI 1326011321 · Family Medicine Physician · Germantown, WI
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Douglas Marx, D.O. is a Family Medicine Physician provider in Germantown, WI (NPI 1326011321).
Provider details
- NPI number
- 1326011321
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 40581 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
909 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Admn Sarscov2 Vacc 1 Dose90480 | 328 | $41 |
| Administration of Influenza Virus VaccineG0008 | 325 | $14 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 126 | $121 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 68 | $86 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 33 | $124 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'S |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 83 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 310 | 122 |
| Lisinopril | 249 | 93 |
| Amlodipine Besylate | 206 | 81 |
| Levothyroxine Sodium | 185 | 77 |
| Pravastatin Sodium | 179 | 67 |
| Simvastatin | 168 | 64 |
| Losartan Potassium | 156 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-02-09
- Last updated
- 2014-02-03
Frequently asked questions
- What is Douglas Marx's NPI number?
- Douglas Marx's National Provider Identifier (NPI) is 1326011321, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Douglas Marx's specialty?
- Douglas Marx is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Douglas Marx located?
- Douglas Marx's practice location on file with NPPES is W168n11237 Western Ave, Germantown, WI 53022-3239.
- What is Douglas Marx's phone number?
- The practice phone number listed in the NPPES registry for Douglas Marx is (262) 253-5060.
- Does Douglas Marx accept Medicare?
- Douglas Marx is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Douglas Marx's NPI active?
- Yes — Douglas Marx's NPI (1326011321) is active in the NPPES registry as of the last update on 2014-02-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.