MARK ANTHONY RITTER M.D. RPH.
NPI 1265579387
Psychiatry & Neurology - Psychiatry in Fairfax, VA
About Mark Anthony Ritter M.d. Rph. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARK ANTHONY RITTER M.D. RPH. (NPI 1265579387) is an individual psychiatry provider in Fairfax, Virginia, licensed in Maryland (D61197) and active in the NPI registry since January 2007. He is enrolled in Medicare PECOS and is a graduate of Wayne State University School Of Medicine (2001).
NPPES Registry Identity
Specialties & Licenses 2
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
Mark Anthony Ritter M.d. Rph. 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 Reassignment
Medicare enrollment records show Mark Ritter reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Gaithersburg, MD 20878
- Reassigned Medicare billing, District of Columbia and Maryland enrollments
- 340 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 22033 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
FAIRFAX, VA 22033
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 Ritter's NPI number?
The NPI number for Mark Ritter is 1265579387. It was assigned to this individual provider in the NPPES registry on January 30, 2007.
Where is Mark Ritter located?
Mark Ritter practices at 4375 Fair Lakes Ct, Fairfax, VA 22033. The listed phone number is (571) 432-2600.
What is Mark Ritter's specialty?
The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.
Is Mark Ritter enrolled in Medicare?
Yes. Mark Ritter 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 organization bills Medicare for Mark Ritter's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Ritter reassigns Medicare benefits to Adventist Physician Services, Inc. (Gaithersburg, MD). The 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 Ritter's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Mark Ritter was last updated on June 17, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.
# Mark Anthony Ritter, M.D. RPH. · NPI 1265579387
Psychiatry physician in Fairfax, Virginia. Individual provider, active in the CMS NPPES registry since January 30, 2007.
## Identity
- **NPI:** 1265579387 (Entity type: Individual)
- **Enumerated:** January 30, 2007
- **Primary specialty:** Psychiatry & Neurology - Psychiatry · taxonomy 2084P0800X
- **State license:** D61197 (Maryland)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 4375 FAIR LAKES CT, Fairfax, VA 22033-4234
- **Phone:** (571) 432-2600
## 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:** Adventist Physician Services, Inc. (NPI 1376623207, Gaithersburg, MD), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Wayne State University School Of Medicine, class of 2001
## Record status
- **NPPES last updated:** June 17, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1265579387) · Data from the CMS NPPES public registry.