FELIX NAU JR MD
NPI 1932632544
Internal Medicine in Washington, MO
About Felix Nau Jr Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
FELIX NAU JR MD (NPI 1932632544) is an individual internal medicine provider in Washington, Missouri, licensed in Missouri (2020015141) and active in the NPI registry since April 2017. He is enrolled in Medicare PECOS, is affiliated with Mercy Hospital Washington, and maintains a secondary practice location in Saint Louis.
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Location 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Felix Nau Jr Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
7Medicare enrollment records show Felix Nau Jr reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Washington, MO 63090
- Reassigned Medicare billing, Missouri enrollment
- 261 clinicians in this Medicare group
Wildwood, MO 63040
- Reassigned Medicare billing, Missouri enrollment
- 744 clinicians in this Medicare group
Saint Louis, MO 63141
- Reassigned Medicare billing, Missouri enrollment
- 435 clinicians in this Medicare group
Saint Louis, MO 63141
- Reassigned Medicare billing, Missouri enrollment
- 326 clinicians in this Medicare group
Saint Louis, MO 63128
- Reassigned Medicare billing, Missouri enrollment
- Medicare enrollment name: St Anthonys Physician Organization Hospitalist Services Lc
- 340 clinicians in this Medicare group
Festus, MO 63028
- Reassigned Medicare billing, Missouri enrollment
- 299 clinicians in this Medicare group
Columbia, MO 65201
- Reassigned Medicare billing, Missouri enrollment
- 302 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 3
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mercy Hospital Washington
Acute Care Hospitals · Washington, MOPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63090 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims 2
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Felix Nau Jr's NPI number?
The NPI number for Felix Nau Jr is 1932632544. It was assigned to this individual provider in the NPPES registry on April 10, 2017.
Where is Felix Nau Jr located?
Felix Nau Jr practices at 901 E 5th St, Washington, MO 63090. The listed phone number is (636) 239-8231.
What is Felix Nau Jr's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Felix Nau Jr enrolled in Medicare?
Yes. Felix Nau Jr is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Felix Nau Jr's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Felix Nau Jr reassigns Medicare benefits to 7 organizations: Mercy Clinic Adult Hospitalists - Washington, LLC (Washington, MO), Mercy Clinic East Communities (Wildwood, MO), Mercy Hospitals East Communities (Saint Louis, MO), Mercy Clinic Adult Hospitalists - St. Louis, LLC (Saint Louis, MO), St Anthonys Physician Organization Hospitalist Services, L.C. (Saint Louis, MO) and 2 more organizations, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Felix Nau Jr's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Felix Nau Jr accept?
Health plans from Anthem Blue Cross and Blue Shield list Felix Nau Jr as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Felix Nau Jr affiliated with any hospitals?
According to CMS data, Felix Nau Jr is affiliated with Mercy Hospital Washington.
When was this NPI record last updated?
The NPPES record for Felix Nau Jr was last updated on September 19, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Felix Nau Jr, MD · NPI 1932632544
Internal Medicine physician in Washington, Missouri. Individual provider, active in the CMS NPPES registry since April 10, 2017.
## Identity
- **NPI:** 1932632544 (Entity type: Individual)
- **Enumerated:** April 10, 2017
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 2020015141 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 901 E 5TH ST, Washington, MO 63090-3127
- **Phone:** (636) 239-8231
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 7 organizations under Medicare reassignment (form CMS-855R): Mercy Clinic Adult Hospitalists - Washington, LLC (NPI 1891943429, Washington, MO); Mercy Clinic East Communities (NPI 1164857397, Wildwood, MO); Mercy Hospitals East Communities (NPI 1851431738, Saint Louis, MO); Mercy Clinic Adult Hospitalists - St. Louis, LLC (NPI 1841235108, Saint Louis, MO); St Anthonys Physician Organization Hospitalist Services, L.C. (NPI 1407216336, Saint Louis, MO); and 2 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2009
## Record status
- **NPPES last updated:** September 19, 2023
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Source: [NPI Profile](https://npiprofile.com/npi/1932632544) · Data from the CMS NPPES public registry.