Quick answers
- Does Tobias R. Chapman accept Medicare assignment?
- Yes. Medicare's clinician data says Tobias R. Chapman 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 Tobias R. Chapman see?
- In 2024, CMS data shows 586 Original Medicare patients and 3,882 services for Tobias R. Chapman. This counts Original Medicare only and measures volume, not quality.
- What is Tobias R. Chapman's NPI number?
- 1588927016. 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 Tobias R. Chapman, 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 | 586 |
|---|---|
| Services billed to Medicare | 3,882 |
| Different services or procedures | 33 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Ct guidance for insertion of radiation therapy fields (77014)1,451 services
- Calculation of radiation therapy dose (77300)508 services
- Radiation treatment management, 5 treatment sessions (77427)461 services
- Design and construction of complex radiation treatment device (77334)371 services
- Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)147 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%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)75%
- Arthritis45%
- Ischemic heart disease33%
- Diabetes29%
Hospitals where Tobias R. Chapman works
Medicare's Facility Affiliation Data lists Tobias R. Chapman at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Inova Alexandria HospitalAlexandria, VA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 490040
- Inova Fair Oaks HospitalFairfax, VA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: not listed by Medicare · CCN 490101
- Inova Fairfax HospitalFalls Church, VA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 490063
- Inova Loudoun HospitalLeesburg, VA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 490043
Practice locations
Addresses where Tobias R. Chapman is enrolled with Medicare (CMS data updated October 2, 2026).
- 3300 Gallows RdFalls Church, VA 22042 (703) 776‑3731
- 44035 Riverside Pkwy, Suite 100Leesburg, VA 20176 (703) 858‑8850
Group practices
Medicare enrollment lists Tobias R. Chapman as a member of this group (CMS data updated October 2, 2026).
- Radiation Oncology Associates PC22 clinicians in the group
Specialties
- Radiation Oncologyprimary
Other radiation oncologists in Virginia
Clinicians with the same Medicare primary specialty in Virginia — not a recommendation.
Other clinicians in Radiation Oncology Associates PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Tufts University School Of Medicine |
| Graduation year | 2012 (14 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1588927016 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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