Robert John Isaak, M.D., PHARM.D.
Radiation Oncology Physician · Des Moines, IA
Robert John Isaak, M.D., PHARM.D. is a radiation oncology physician with a practice address in Des Moines, Iowa, and NPI 1619197464, issued on Apr 26, 2007. Check the license (Iowa 37709, as entered in NPPES) on the Iowa Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Robert John Isaak
- Credential
- M.D., PHARM.D.
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License numbers
- 37709 IA
M-17371 ID
4301084303 MI
Self-reported in NPPES; status is on the state search - Practice location
- 1221 Pleasant St, Des Moines, IA 50309
- Phone
- (515) 241-4330
- Enumerated
- Apr 26, 2007
- Record last updated
- Jul 17, 2025
- Fax
- (515) 241-4363
- Medicare enrollment
- Enrolled (PECOS I20090114000463); accepts Medicare assignment
- Medical or professional school
- University Of Nevada School Of Medicine, 2003
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 67 in Iowa → Look up another NPI →
Also registered at 1221 Pleasant St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Saramma Alexander, MDHematology & Oncology Physician1780645135
- Peter Bartels, D.O.Neurology Physician1346448875
- Robert Behrens, MDMedical Oncology Physician1215999800
- John Berger, M.D.Nuclear Medicine Physician1619960259
- Leyla Best Bandenay, M.D.Infectious Disease Physician1003074931
- Steven Bunge, MDInternal Medicine Physician1568460012
Verify Robert John Isaak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIowa Board of Medicine
Search for license 37709Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
47% fewer Medicare Part D claims than the average radiation oncology physician in 2024
71 Medicare Part D claims for 34 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D.
Most prescribed
- Tamsulosin Hcl31 claims
- Memantine 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 3 group practices
- Central Iowa Hospital CorporationDes Moines, IA
- Teton County Hospital DistrictJackson, WY
- Utah Cancer Specialists PCIdaho Falls, ID
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Robert John Isaak among 67 radiation oncology physician records in Iowa
Robert John Isaak, M.D., PHARM.D. is one of 67 radiation oncology physician records with a practice address in Iowa. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 37% of them.
- NPI issued2007 · 37% of these records are older, 49% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 67% of these records are
- Graduated2003 · median 2010 among the 45 with a school on file
- Record last updated2025 · 60% 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 Iowa 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 Iowa
There are 67 radiation oncology physician records in Iowa.
All 67 in Iowa → Every provider in Des Moines → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Crosby RockDes Moines, IA 503091457849259
- Samuel Schroeder, M.D.Des Moines, IA 503091861871105
- Arshin Sheybani, M.D.Des Moines, IA 503091407082712
- John Triantafyllos, M.D.Des Moines, IA 503091720053705
- Truston Bodine, MD, PHDDes Moines, IA 503141740787845
- Joseph Carmicheal, MD, PHDDes Moines, IA 503141871239921
- Philip Colletier, MDDes Moines, IA 503141760569412
- Richard Deming, MDDes Moines, IA 503141255418059
Common questions
What is Robert John Isaak, M.D., PHARM.D.'s NPI number?
Robert John Isaak, M.D., PHARM.D.'s National Provider Identifier (NPI) is 1619197464, issued on Apr 26, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Robert John Isaak, M.D., PHARM.D. located?
The NPPES record lists a practice address at 1221 Pleasant St, Des Moines, IA, 50309. Phone: (515) 241-4330. Providers update this record themselves, so call before visiting.
How can I verify Robert John Isaak, M.D., PHARM.D.'s license?
NPPES lists Iowa license number 37709, 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 Robert John Isaak, M.D., PHARM.D. prescribe under Medicare Part D?
In 2024, Robert John Isaak, M.D., PHARM.D. had 71 Medicare Part D claims for 34 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.