Mark Theiss, M.D.
NPI 1669534350 · Sports Medicine (Orthopaedic Surgery) Physician · Falls Church, VA
Enrolled with Medicare as Practitioner - Sports Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Theiss, M.D. is a Sports Medicine (Orthopaedic Surgery) Physician provider in Falls Church, VA (NPI 1669534350).
Provider details
- NPI number
- 1669534350
- Entity type
- Individual
- Primary specialty
- Sports Medicine (Orthopaedic Surgery) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 0101036798 (VA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,025 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Aspiration And/Or Injection of Fluid From Large Joint20610 | 216 | $80 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 216 | $141 |
| X-Ray of Knee, 4 Or More Views73564 | 154 | $54 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 110 | $182 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 92 | $198 |
| X-Ray of Hip, 2-3 Views73502 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Oxycodone Hcl | 96 | 37 |
| Apixabanbrand: Eliquis | 55 | 40 |
| Amoxicillin | 33 | 18 |
| Diclofenac Sodium | 33 | 12 |
| Hydromorphone Hcl | 16 | — |
| Tramadol Hcl | 14 | 13 |
| Cefdinir | 13 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-12-16
- Last updated
- 2022-01-29
- Certified
- 2022-01-29
Frequently asked questions
- What is Mark Theiss's NPI number?
- Mark Theiss's National Provider Identifier (NPI) is 1669534350, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Theiss's specialty?
- Mark Theiss is listed in the NPPES registry with a primary specialty of Sports Medicine (Orthopaedic Surgery) Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Theiss located?
- Mark Theiss's practice location on file with NPPES is 3300 Gallows Rd, Falls Church, VA 22042-3300.
- What is Mark Theiss's phone number?
- The practice phone number listed in the NPPES registry for Mark Theiss is (703) 776-4001.
- Does Mark Theiss accept Medicare?
- Mark Theiss is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Theiss's NPI active?
- Yes — Mark Theiss's NPI (1669534350) is active in the NPPES registry as of the last update on 2022-01-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.