DR. MARK NAU M.D.
NPI 1033579479
Internal Medicine - Critical Care Medicine in Fort Belvoir, VA
About Dr. Mark Nau M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARK NAU M.D. (NPI 1033579479) is an individual critical care medicine provider in Fort Belvoir, Virginia, licensed in Maryland (D0093781) and active in the NPI registry since February 2016. He is enrolled in Medicare PECOS, is affiliated with Johns Hopkins Howard County Medical Center, and is a graduate of Indiana University School Of Medicine (2016).
NPPES Registry Identity
Specialties & Licenses 3
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
Dr. Mark Nau M.d. 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
4Medicare enrollment records show Mark Nau reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Woodbridge, VA 22192
- Reassigned Medicare billing, Virginia enrollment
- Medicare enrollment name: Uva Community Health Medical Group LLC
- 584 clinicians in this Medicare group
Arlington, VA 22203
- Reassigned Medicare billing, District of Columbia and Maryland enrollments
- Also billed through NPI 1689485963 (Maryland)
- 691 clinicians in this Medicare group
Salisbury, MD 21801
- Reassigned Medicare billing, Maryland enrollment
- 531 clinicians in this Medicare group
Chesapeake, VA 23321
- Reassigned Medicare billing, Virginia enrollment
- 570 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
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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Johns Hopkins Howard County Medical Center
Acute Care Hospitals · Columbia, MDNovant Prince William Medical Center
Acute Care Hospitals · Manassas, VAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 22060 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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.
FORT BELVOIR, VA 22060
FORT BELVOIR, VA 22060
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 Mark Nau's NPI number?
The NPI number for Mark Nau is 1033579479. It was assigned to this individual provider in the NPPES registry on February 27, 2016.
Where is Mark Nau located?
Mark Nau practices at 9300 Dewitt Loop, Fort Belvoir, VA 22060. The listed phone number is (571) 231-1605.
What is Mark Nau's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.
Is Mark Nau enrolled in Medicare?
Yes. Mark Nau 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 Mark Nau's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Nau reassigns Medicare benefits to 4 organizations: Nmg Affiliate Practice I, LLC (Woodbridge, VA), Johns Hopkins Community Physicians (Arlington, VA), Tidalhealth Specialty Care, LLC (Salisbury, MD) and Bayview Physician Services, PC (Chesapeake, VA). 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 Mark Nau's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mark Nau accept?
Health plans from Oscar Health list Mark Nau 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 Mark Nau affiliated with any hospitals?
According to CMS data, Mark Nau is affiliated with Johns Hopkins Howard County Medical Center and Novant Prince William Medical Center.
When was this NPI record last updated?
The NPPES record for Mark Nau was last updated on May 19, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 months 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.
# Dr. Mark Nau, M.D. · NPI 1033579479
Critical Care Medicine physician in Fort Belvoir, Virginia. Individual provider, active in the CMS NPPES registry since February 27, 2016.
## Identity
- **NPI:** 1033579479 (Entity type: Individual)
- **Enumerated:** February 27, 2016
- **Primary specialty:** Internal Medicine - Critical Care Medicine · taxonomy 207RC0200X
- **State license:** D0093781 (Maryland)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 9300 DEWITT LOOP, Fort Belvoir, VA 22060-5285
- **Phone:** (571) 231-1605
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Nmg Affiliate Practice I, LLC (NPI 1336819408, Woodbridge, VA); Johns Hopkins Community Physicians (NPI 1902626765, Arlington, VA); Tidalhealth Specialty Care, LLC (NPI 1619504735, Salisbury, MD); Bayview Physician Services, PC (NPI 1508813387, Chesapeake, VA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Indiana University School Of Medicine, class of 2016
## Record status
- **NPPES last updated:** May 19, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1033579479) · Data from the CMS NPPES public registry.