Felix Nau Jr, MD
Internal Medicine Physician · Washington, MO
Felix Nau Jr, MD is an internal medicine physician with a practice address in Washington, Missouri, and NPI 1932632544, issued on Apr 10, 2017. Check the license (Missouri 2020015141, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Felix Nau Jr
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 2020015141 MO
Self-reported in NPPES; status is on the state search - Practice location
- 901 E 5TH St, Washington, MO 63090
- Phone
- (636) 239-8231
- Enumerated
- Apr 10, 2017
- Record last updated
- Sep 19, 2023
- Medicare enrollment
- Enrolled (PECOS I20200721001367); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,604 in Missouri → Look up another NPI →
Also registered at 901 E 5TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Suraj Kumar Alakkassery Kumaran, MDInternal Medicine Physician1568698306
- Lydia Archuleta, M.D.Internal Medicine Physician1205282639
- Fiona Aronberg, ACNPAcute Care Nurse Practitioner1396903506
- Sarah Becker, COTAOccupational Therapy Assistant1457563082
- Melissa Bedel, NPAcute Care Nurse Practitioner1326755505
- Rajasekhar Bhoda, M.DHospitalist Physician1144485798
Verify Felix Nau Jr in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license 2020015141Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
76% fewer Medicare Part D claims than the average internal medicine physician in 2024
768 Medicare Part D claims for 347 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 54 claims were for opioids.
Most prescribed
- Amoxicillin-Clavulanate Potass42 claims
- Furosemide42 claims
- Cefpodoxime Proxetil30 claims
- Doxycycline Hyclate30 claims
- Metoprolol Tartrate29 claims
- Ondansetron Odt29 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
- Mercy Clinic Adult Hospitalists - Washington, LLCWashington, MO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Felix Nau Jr among 2,604 internal medicine physician records in Missouri
Felix Nau Jr, MD is one of 2,604 internal medicine physician records with a practice address in Missouri. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2017, is newer than 67% of them.
- NPI issued2017 · 67% of these records are older, 31% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 55% of these records are
- Graduated2009 · median 2006 among the 1,443 with a school on file
- Record last updated2023 · 48% 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 Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
25 internal medicine physician records list a practice address in Washington
They are 25 of the 533 NPPES records with a practice address in Washington, and 2,604 internal medicine physician records in Missouri.
All 2,604 in Missouri → Every provider in Washington → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Suraj Kumar Alakkassery Kumaran, MDWashington, MO 630901568698306
- Bryce Ayers, M.D.Washington, MO 630901689610446
- Tim Baker, MDWashington, MO 630901760596134
- David Brunworth, MDWashington, MO 630901265546634
- Gary Dumontier, M.D.Washington, MO 630901437192481
- Sarah Dyson, MDWashington, MO 630901922020064
- Thomas Farrell, M.D.Washington, MO 630901952345969
- William Fritz, MDWashington, MO 630901407820913
Common questions
What is Felix Nau Jr, MD's NPI number?
Felix Nau Jr, MD's National Provider Identifier (NPI) is 1932632544, issued on Apr 10, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Felix Nau Jr, MD located?
The NPPES record lists a practice address at 901 E 5TH St, Washington, MO, 63090. Phone: (636) 239-8231. Providers update this record themselves, so call before visiting.
How can I verify Felix Nau Jr, MD's license?
NPPES lists Missouri license number 2020015141, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Felix Nau Jr, MD prescribe under Medicare Part D?
In 2024, Felix Nau Jr, MD had 768 Medicare Part D claims for 347 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.