Mark Mcmahon, MD
NPI 1497764435 · Orthopaedic Surgery Physician · Fairfax, VA
Enrolled with Medicare as Practitioner - Orthopedic Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Mcmahon, MD is a Orthopaedic Surgery Physician provider in Fairfax, VA (NPI 1497764435).
Provider details
- NPI number
- 1497764435
- Entity type
- Individual
- Primary specialty
- Orthopaedic Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 0101049426 (VA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-07
- Last updated
- 2020-10-28
- Certified
- 2020-10-28
Frequently asked questions
- What is Mark Mcmahon's NPI number?
- Mark Mcmahon's National Provider Identifier (NPI) is 1497764435, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Mcmahon's specialty?
- Mark Mcmahon is listed in the NPPES registry with a primary specialty of Orthopaedic Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Mcmahon located?
- Mark Mcmahon's practice location on file with NPPES is 3620 Joseph Siewick Dr, Fairfax, VA 22033-1757.
- What is Mark Mcmahon's phone number?
- The practice phone number listed in the NPPES registry for Mark Mcmahon is (703) 810-5223.
- Does Mark Mcmahon accept Medicare?
- Mark Mcmahon is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Mcmahon's NPI active?
- Yes — Mark Mcmahon's NPI (1497764435) is active in the NPPES registry as of the last update on 2020-10-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.