John Markus Rieth, MD
Medical Oncology Physician · Iowa City, IA
John Markus Rieth, MD is a medical oncology physician with a practice address in Iowa City, Iowa, and NPI 1528559937, issued on May 21, 2018. Check the license (Iowa MD-48661, as entered in NPPES) on the Iowa Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- John Markus Rieth
- Credential
- MD
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- MD-48661 IA
Self-reported in NPPES; status is on the state search - Practice location
- 200 Hawkins Dr, Iowa City, IA 52242
- Phone
- (319) 356-3077
- Enumerated
- May 21, 2018
- Record last updated
- Jul 22, 2023
- Fax
- (319) 353-8383
- Medicare enrollment
- Enrolled (PECOS I20230720002296); accepts Medicare assignment
- Medical or professional school
- Indiana University School Of Medicine, 2018
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 61 in Iowa → Look up another NPI →
Also registered at 200 Hawkins Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Abdalla Abdalla, MBBCHAnatomic Pathology & Clinical Pathology Physician1518859826
- Sameh AbdallaAnatomic Pathology & Clinical Pathology Physician1437902160
Verify John Markus Rieth in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIowa Board of Medicine
Search for license MD-48661Check 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% fewer Medicare Part D claims than the average medical oncology physician in 2024
282 Medicare Part D claims for 53 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 22 claims were for opioids.
Most prescribed
- Imatinib Mesylate64 claims
- Ondansetron Hcl30 claims
- Levothyroxine Sodium22 claims
- Sulfamethoxazole-Trimethoprim17 claims
- Prochlorperazine Maleate15 claims
- Prednisone13 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: $8,621.69
19 payments; by number, the most common kind was food and beverage; the largest payer was Deciphera Pharmaceuticals Inc. The 3,343 providers of this specialty with any payment received $11,773.47 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
- State University OF IowaIowa City, IA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Markus Rieth among 61 medical oncology physician records in Iowa
John Markus Rieth, MD is one of 61 medical oncology physician records with a practice address in Iowa. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 84% of them.
- NPI issued2018 · 84% of these records are older, 13% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated2018 · median 2002 among the 45 with a school on file
- Record last updated2023 · 36% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RX0202X and a Iowa practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Oncology Physician providers in Iowa
There are 61 medical oncology physician records in Iowa.
All 61 in Iowa → Every provider in Iowa City → Medical Oncology Physician nationwide →
The 8 medical oncology physician records with the nearest ZIP codes
- Taher Abu Hejleh, M.B.B.S.Iowa City, IA 522421447469655
- Mark Burkard, M.D.Iowa City, IA 522421194903971
- Margaret Byrne, M.D.Iowa City, IA 522421295027696
- Gerald Clamon, MDIowa City, IA 522421114902913
- Naomi Fei, M.D.Iowa City, IA 522421760878755
- Gustavo Fernandes Godoy Almeida, MDPHDIowa City, IA 522421073336392
- Roger Gingrich, MDIowa City, IA 522421164410007
- Ali Naderi, MDIowa City, IA 522421386996114
Common questions
What is John Markus Rieth, MD's NPI number?
John Markus Rieth, MD's National Provider Identifier (NPI) is 1528559937, issued on May 21, 2018. An NPI identifies a provider in billing; it is not a license.
Where is John Markus Rieth, MD located?
The NPPES record lists a practice address at 200 Hawkins Dr, Iowa City, IA, 52242. Phone: (319) 356-3077. Providers update this record themselves, so call before visiting.
How can I verify John Markus Rieth, MD's license?
NPPES lists Iowa license number MD-48661, as entered by the provider. Search the Iowa Board of Medicine at https://dial.iowa.gov/about-dial/boards-and-commissions/medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John Markus Rieth, MD prescribe under Medicare Part D?
In 2024, John Markus Rieth, MD had 282 Medicare Part D claims for 53 beneficiaries; the average among medical oncology physician prescribers was 703. 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.