Felix Nau Jr, MD
NPI 1932632544 · Internal Medicine Physician · Washington, MO
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Felix Nau Jr, MD is a Internal Medicine Physician provider in Washington, MO (NPI 1932632544).
Provider details
- NPI number
- 1932632544
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 2020015141 (MO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
9 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
489 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 287 | $73 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 182 | $106 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 20 | $122 |
Typical Medicare-allowed amounts for these services range $73–$122 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 24 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 42 | 42 |
| Furosemide | 42 | 24 |
| Cefpodoxime Proxetil | 30 | 30 |
| Doxycycline Hyclate | 30 | 30 |
| Metoprolol Tartrate | 29 | 27 |
| Ondansetronbrand: Ondansetron Odt | 29 | 29 |
| Prednisone | 28 | 28 |
Practice location
Mailing address
Additional practice locations (1)
- 615 S New Ballas RdSaint Louis, MO 63141-8221Phone: (314) 251-6339
Registry dates
- Enumerated
- 2017-04-10
- Last updated
- 2023-09-19
- Certified
- 2023-09-19
Frequently asked questions
- What is Felix Nau Jr's NPI number?
- Felix Nau Jr's National Provider Identifier (NPI) is 1932632544, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Felix Nau Jr's specialty?
- Felix Nau Jr is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Felix Nau Jr located?
- Felix Nau Jr's practice location on file with NPPES is 901 E 5th St, Washington, MO 63090-3127.
- What is Felix Nau Jr's phone number?
- The practice phone number listed in the NPPES registry for Felix Nau Jr is (636) 239-8231.
- Does Felix Nau Jr accept Medicare?
- Felix Nau Jr is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Felix Nau Jr's NPI active?
- Yes — Felix Nau Jr's NPI (1932632544) is active in the NPPES registry as of the last update on 2023-09-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.