David Jaihun Byun, MD
Radiation Oncology Physician · Hartford, CT
David Jaihun Byun, MD is a radiation oncology physician with a practice address in Hartford, Connecticut, and NPI 1619409802, issued on Mar 28, 2017. Check the license (Connecticut 80229, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- David Jaihun Byun
- Credential
- MD
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License numbers
- 80229 CT
314461 NY
Self-reported in NPPES; status is on the state search - Practice location
- 80 Seymour St, Hartford, CT 06106
- Phone
- (860) 545-2803
- Enumerated
- Mar 28, 2017
- Record last updated
- Feb 25, 2025
- Medicare enrollment
- Enrolled (PECOS I20250317003620); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 82 in Connecticut → Look up another NPI →
Also registered at 80 Seymour St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Ahmad Al Nawaiseh, MDCardiovascular Disease Physician1780318543
- Yasser Al-Baghdadi, M.D.Anesthesiology Physician1023045184
- Francis Aldo, D.O.Anesthesiology Physician1912185844
Verify David Jaihun Byun in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 80229Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
22% more Medicare Part D claims than the average radiation oncology physician in 2024
163 Medicare Part D claims for 51 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D.
Most prescribed
- Tamsulosin Hcl91 claims
- Solifenacin Succinate23 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 84.5 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $2,775.42
9 payments; by number, the most common kind was food and beverage; the largest payer was Elekta, Inc. The 3,275 providers of this specialty with any payment received $1,897.85 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Hartford Radiation Oncology Associates PCHartford, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
David Jaihun Byun among 82 radiation oncology physician records in Connecticut
David Jaihun Byun, MD is one of 82 radiation oncology physician records with a practice address in Connecticut. 93% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2017, is newer than 79% of them.
- NPI issued2017 · 79% of these records are older, 17% newer
- In a Medicare fileYes · 93% of these records are
- In the CMS Doctors and Clinicians fileYes · 79% of these records are
- Graduated2017 · median 2007 among the 64 with a school on file
- Record last updated2025 · 66% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0001X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Radiation Oncology Physician providers in Connecticut
There are 82 radiation oncology physician records in Connecticut.
All 82 in Connecticut → Every provider in Hartford → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Emily Anstadt LutzHartford, CT 061061295222784
- Adriana Blakaj, M.D., PH.D.Hartford, CT 061061831584614
- Judith Buckley, M.D.Hartford, CT 061061770543050
- Joshua Doyle, MD, MSHartford, CT 061061306316625
- Juhi PurswaniHartford, CT 061061740844042
- Charles Rutter, M.D.Hartford, CT 061061346532173
- Bruce Kaplan, M.D.Hartford, CT 061051003829615
- Richard Shumway, M.D.Hartford, CT 061051649207762
Common questions
What is David Jaihun Byun, MD's NPI number?
David Jaihun Byun, MD's National Provider Identifier (NPI) is 1619409802, issued on Mar 28, 2017. An NPI identifies a provider in billing; it is not a license.
Where is David Jaihun Byun, MD located?
The NPPES record lists a practice address at 80 Seymour St, Hartford, CT, 06106. Phone: (860) 545-2803. Providers update this record themselves, so call before visiting.
How can I verify David Jaihun Byun, MD's license?
NPPES lists Connecticut license number 80229, as entered by the provider. Search the Connecticut Medical Examining Board at https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does David Jaihun Byun, MD prescribe under Medicare Part D?
In 2024, David Jaihun Byun, MD had 163 Medicare Part D claims for 51 beneficiaries; the average among radiation oncology physician prescribers was 134. Part D covers Medicare prescriptions only.
What is David Jaihun Byun, MD's MIPS final score?
The 2023 MIPS final score is 84.5 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.