Dr. David J. Byun, MD
Radiation Oncology (Radiation Oncology Physician)
- Medicare participating
At a glance
- Years since graduation
- 9
- In the NPI registry since
- 2017
- Medicare patients seen, 2024
- 122
Licensed in Connecticut since 2025, according to the Connecticut Department of Public Health. We show license dates only for the states that publish them in bulk; see which states do. For other states, check the state medical board.
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. What an NPI is
Education and training
- 2017Registered with an NPI (national billing number; not a license date)
Medicare’s Care Compare data doesn’t list this clinician’s medical school. Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Radiation Oncology Physician primary
CT license 80229 (first issued 2025; active) · NY license 314461
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Hartford Hospital Hartford, CT
- Manchester Memorial Hospital Manchester, CT
Medical groups
- Hartford Radiation Oncology Associates PC (12 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare patients and services
- Medicare patients, 2024
- 122
- Services billed
- 702
- Patients’ average age
- 75
| Service | Times | Patients |
|---|---|---|
| Ct guidance for insertion of radiation therapy fields | 304 | 44 |
| Radiation treatment management, 5 treatment sessions | 68 | 35 |
| Calculation of radiation therapy dose | 66 | 18 |
| Design and construction of complex radiation treatment device | 42 | 19 |
| Design and construction of simple radiation treatment device | 32 | 16 |
| Complex radiation therapy planning | 22 | 22 |
| New patient office or other outpatient visit, 60-74 minutes | 19 | 19 |
| Prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or | 17 | 14 |
| Obtaining data needed to develop the optimal radiation treatment, 1 treatment area | 15 | 14 |
| Design and construction of radiation treatment device for high precision radiation therapy | 14 | 11 |
Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.
Medicare prescriptions
| Drug | Prescriptions |
|---|---|
| Tamsulosin Hcl Other prescribers in Hartford, CT | 91 |
| Solifenacin Succinate Other prescribers in Hartford, CT | 23 |
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.
Payments from drug and device companies
In 2025, 1 companies reported 1 payments worth $1,860 in total to this clinician.
| Philips North America LLC | $1,860 |
|---|
| Honoraria | $1,860 |
|---|
What the payments were for
| Company | What it was for | Amount |
|---|---|---|
| Philips North America LLC Jan 8, 2025 | Honoraria | $1,860 |
Each payment as the company reported it, with the products it named. Meals are counted in the totals above but not listed one by one.
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.