Eugene J. Koay, M.D., PH.D.
Radiation Oncology Physician · Houston, TX
Eugene J. Koay, M.D., PH.D. is a radiation oncology physician with a practice address in Houston, Texas, and NPI 1699011924, issued on Dec 13, 2012. Check the license (Texas BP20038551, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Eugene J. Koay
- Credential
- M.D., PH.D.
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- BP20038551 TX
Self-reported in NPPES; status is on the state search - Practice location
- 1220 Holcombe Blvd, Houston, TX 77030
- Phone
- (817) 805-2839
- Enumerated
- Dec 13, 2012
- Record last updated
- Dec 13, 2012 (not updated in 14 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20140703000617); accepts Medicare assignment
- Medical or professional school
- Baylor College Of Medicine, 2009
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 449 in Texas → Look up another NPI →
Also registered at 1220 Holcombe Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Karthika Amaranathan, MDDiagnostic Radiology Physician1437654910
- Meng Chauv, RPHPharmacist1508866732
- Joseph Corriere, M.D.Urology Physician1689609786
- Jacalyn Johnson-Alviza, MS, PA-CPhysician Assistant1609944297
- Jeff McClusky, RPHPharmacist1124312996
- Joshua St Fleur, RNRegistered Nurse1730024852
Verify Eugene J. Koay in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license BP20038551Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
86% fewer Medicare Part D claims than the average radiation oncology physician in 2024
19 Medicare Part D claims for 14 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D.
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): 81.4 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: $210.22
3 payments; by number, the most common kind was travel and lodging; the largest payer was Histosonics,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
- Physicians Referral ServiceSugar Land, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Eugene J. Koay among 449 radiation oncology physician records in Texas
Eugene J. Koay, M.D., PH.D. is one of 449 radiation oncology physician records with a practice address in Texas. 85% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 69% of them.
- NPI issued2012 · 69% of these records are older, 27% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileYes · 78% of these records are
- Graduated2009 · median 2004 among the 348 with a school on file
- Record last updated2012 · 61% 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 Texas 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 Texas
There are 449 radiation oncology physician records in Texas.
All 449 in Texas → Every provider in Houston → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Neelofur Ahmad, M.D.Houston, TX 770301154320976
- Edward Butler, M.D.Houston, TX 770301679565972
- Aileen Chen, MDHouston, TX 770301801876560
- Seungtaek Choi, M.D.Houston, TX 770301205860590
- Gregory Chronowski, M.D.Houston, TX 770301598789570
- Amol Ghia, M.D.Houston, TX 770301629030291
- Beverly Guadagnolo, M.D., MPHHouston, TX 770301407866676
- Joseph Herman, M.D.Houston, TX 770301346291465
Common questions
What is Eugene J. Koay, M.D., PH.D.'s NPI number?
Eugene J. Koay, M.D., PH.D.'s National Provider Identifier (NPI) is 1699011924, issued on Dec 13, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Eugene J. Koay, M.D., PH.D. located?
The NPPES record lists a practice address at 1220 Holcombe Blvd, Houston, TX, 77030. Phone: (817) 805-2839. Providers update this record themselves, so call before visiting.
How can I verify Eugene J. Koay, M.D., PH.D.'s license?
NPPES lists Texas license number BP20038551, as entered by the provider. Search the Texas Medical Board at https://profile.tmb.state.tx.us/Search.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Eugene J. Koay, M.D., PH.D. prescribe under Medicare Part D?
In 2024, Eugene J. Koay, M.D., PH.D. had 19 Medicare Part D claims for 14 beneficiaries; the average among radiation oncology physician prescribers was 134. Part D covers Medicare prescriptions only.
What is Eugene J. Koay, M.D., PH.D.'s MIPS final score?
The 2023 MIPS final score is 81.4 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.