Quick answers
- Does Mary T. Tierney accept Medicare assignment?
- Yes. Medicare's clinician data says Mary T. Tierney accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Mary T. Tierney see?
- In 2024, CMS data shows 29 Original Medicare patients and 55 services for Mary T. Tierney. This counts Original Medicare only and measures volume, not quality.
- What is Mary T. Tierney's NPI number?
- 1073721874. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Mary T. Tierney, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 29 |
|---|---|
| Services billed to Medicare | 55 |
| Different services or procedures | 3 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Psychotherapy, 1 hour (90837)31 services
- Psychotherapy, 45 minutes (90834)13 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Arthritis62%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)62%
- Anxiety48%
- Depression45%
Practice locations
Addresses where Mary T. Tierney is enrolled with Medicare (CMS data updated October 2, 2026).
- 44035 Riverside Pkwy, Suite 300Leesburg, VA 20176 (703) 554‑6800
- 8613 Route 29, 200nFairfax, VA 22031 (703) 280‑5390
Group practices
Medicare enrollment lists Mary T. Tierney as a member of this group (CMS data updated October 2, 2026).
- Virginia Cancer Specialists, P.C.82 clinicians in the group
Specialties
- Clinical Social Workerprimary
Other clinical social workers in Leesburg
Clinicians with the same Medicare primary specialty in Leesburg, VA — not a recommendation.
Other clinicians in Virginia Cancer Specialists, P.C.
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | CSW |
|---|---|
| Graduation year | 1996 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1073721874 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians