John K. Ma, MD, PHD
Radiation Oncology Physician · Topeka, KS
John K. Ma, MD, PHD is a radiation oncology physician with a practice address in Topeka, Kansas, and NPI 1205067758, issued on Jul 31, 2009. Check the license (Kansas 04 37990, as entered in NPPES) on the Kansas State Board of Healing Arts; the Medicare figures below come from public CMS files.
- Name
- John K. Ma
- Credential
- MD, PHD
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- 04 37990 KS
Self-reported in NPPES; status is on the state search - Practice location
- 1414 SW 8TH Ave, Topeka, KS 66606
- Phone
- (785) 354-5300
- Enumerated
- Jul 31, 2009
- Record last updated
- Feb 13, 2026
- Medicare enrollment
- Enrolled (PECOS I20150630001794); accepts Medicare assignment
- Medical or professional school
- University Of Mississippi School Of Medicine, 2009
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 68 in Kansas → Look up another NPI →
Also registered at 1414 SW 8TH Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Mahmoud Abdallah, MDHematology & Oncology Physician1538645791
- Yaman Alali, MDHematology & Oncology Physician1134781941
- Emily AndersonPharmacist1295517043
- Amy ArthingtonNurse Practitioner1942981519
- Alec Britt, MDHematology & Oncology Physician1891290565
- Deborah Edelman-Dolan, LSCSWClinical Social Worker1568433456
Verify John K. Ma in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersKansas State Board of Healing Arts
Search for license 04 37990Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
60% more Medicare Part D claims than the average radiation oncology physician in 2024
214 Medicare Part D claims for 80 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D.
Most prescribed
- Tamsulosin Hcl37 claims
- Prednisone29 claims
- Fluconazole27 claims
- Dexamethasone20 claims
- Pentoxifylline18 claims
- Lidocaine Hcl Viscous12 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.
Industry payments in 2024: $239.96
7 payments; by number, the most common kind was food and beverage; the largest payer was Medtronic, 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
- Cotton-O'Neil Clinic Revocable TrustTopeka, KS
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John K. Ma among 68 radiation oncology physician records in Kansas
John K. Ma, MD, PHD is one of 68 radiation oncology physician records with a practice address in Kansas. 72% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 66% of them.
- NPI issued2009 · 66% of these records are older, 28% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2009 · median 2007 among the 41 with a school on file
- Record last updated2026 · 63% 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 Kansas 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 Kansas
There are 68 radiation oncology physician records in Kansas.
All 68 in Kansas → Every provider in Topeka → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Ralph Reymond, M.D.Topeka, KS 666061932135209
- Stephen Coon, M.D.Topeka, KS 666041528098126
- Russell Greene, M.D.Topeka, KS 666041588693832
- Judith Kooser, M.D.Topeka, KS 666041356386031
- Martin Bell, M.D.Manhattan, KS 665021447316047
- Russell Reitz, MDManhattan, KS 665021902882194
- Darren Klish, M.D.Chanute, KS 667201922164524
- Duane Myers, MDPittsburg, KS 667621881692978
Common questions
What is John K. Ma, MD, PHD's NPI number?
John K. Ma, MD, PHD's National Provider Identifier (NPI) is 1205067758, issued on Jul 31, 2009. An NPI identifies a provider in billing; it is not a license.
Where is John K. Ma, MD, PHD located?
The NPPES record lists a practice address at 1414 SW 8TH Ave, Topeka, KS, 66606. Phone: (785) 354-5300. Providers update this record themselves, so call before visiting.
How can I verify John K. Ma, MD, PHD's license?
NPPES lists Kansas license number 04 37990, as entered by the provider. Search the Kansas State Board of Healing Arts at https://www.ksbha.ks.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John K. Ma, MD, PHD prescribe under Medicare Part D?
In 2024, John K. Ma, MD, PHD had 214 Medicare Part D claims for 80 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.