Stephen Ko, MD
Radiation Oncology Physician · Jacksonville, FL
Stephen Ko, MD is a radiation oncology physician with a practice address in Jacksonville, Florida, and NPI 1134183304, issued on Apr 14, 2006. Check the license (Florida ME90642, as entered in NPPES) on the Florida health license search; the Medicare figures below come from public CMS files.
- Name
- Stephen Ko
- Credential
- MD
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License numbers
- ME90642 FL
2025045903 MO
Self-reported in NPPES; status is on the state search - Practice location
- 4500 San Pablo RD S, Jacksonville, FL 32224
- Phone
- (904) 953-2000
- Enumerated
- Apr 14, 2006
- Record last updated
- Dec 19, 2025
- Medicare enrollment
- Enrolled (PECOS I20251226000587); accepts Medicare assignment
- Medical or professional school
- University Of Texas At Austin Dell Medical School, 1999
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 520 in Florida → Look up another NPI →
Also registered at 4500 San Pablo RD S
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Zaid Abdel Rahman, M.D.Hematology (Internal Medicine) Physician1003299330
Verify Stephen Ko in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersFlorida health license search
Search for license ME90642Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
11% fewer Medicare Part D claims than the average radiation oncology physician in 2024
119 Medicare Part D claims for 47 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D. 43 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen18 claims
- Oxycodone Hcl15 claims
- Tamsulosin Hcl15 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.
Bills Medicare through 2 group practices
- Ssm Regional Health ServicesJefferson City, MO
- White River Health System, Inc.Batesville, AR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Stephen Ko among 520 radiation oncology physician records in Florida
Stephen Ko, MD is one of 520 radiation oncology physician records with a practice address in Florida. 86% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 21% of them.
- NPI issued2006 · 21% of these records are older, 47% newer
- In a Medicare fileYes · 86% of these records are
- In the CMS Doctors and Clinicians fileYes · 76% of these records are
- Graduated1999 · median 2002 among the 393 with a school on file
- Record last updated2025 · 50% 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 Florida 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 Florida
There are 520 radiation oncology physician records in Florida.
All 520 in Florida → Every provider in Jacksonville → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Albert Attia, MDJacksonville, FL 322241205008349
- Steven Buskirk, MDJacksonville, FL 322241659361582
- John Earle, M.D.Jacksonville, FL 322241568452498
- Corey Hobbs, M.D.Jacksonville, FL 322241336433770
- Adam Holtzman, M.D.Jacksonville, FL 322241770929192
- Bradford Hoppe, MD, MPHJacksonville, FL 322241275791055
- Sungjune Kim, M.D. PH.D.Jacksonville, FL 322241407170277
- Byron May, MDJacksonville, FL 322241437107885
Common questions
What is Stephen Ko, MD's NPI number?
Stephen Ko, MD's National Provider Identifier (NPI) is 1134183304, issued on Apr 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Stephen Ko, MD located?
The NPPES record lists a practice address at 4500 San Pablo RD S, Jacksonville, FL, 32224. Phone: (904) 953-2000. Providers update this record themselves, so call before visiting.
How can I verify Stephen Ko, MD's license?
NPPES lists Florida license number ME90642, as entered by the provider. Search the Florida health license search at https://mqa-internet.doh.state.fl.us/mqasearchservices/healthcareproviders. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Stephen Ko, MD prescribe under Medicare Part D?
In 2024, Stephen Ko, MD had 119 Medicare Part D claims for 47 beneficiaries; the average among radiation oncology physician prescribers was 134. Part D covers Medicare prescriptions only.
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.