DR. JOHN MARKUS RIETH MD
NPI 1528559937
Internal Medicine - Medical Oncology in Iowa City, IA
About Dr. John Markus Rieth Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JOHN MARKUS RIETH MD (NPI 1528559937) is an individual medical oncology provider in Iowa City, Iowa, licensed in Iowa (MD-48661) and active in the NPI registry since May 2018. He is enrolled in Medicare PECOS, is affiliated with University Of Iowa Health Care Medical Center Down, and is a graduate of Indiana University School Of Medicine (2018).
NPPES Registry Identity
Specialties & Licenses 2
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. John Markus Rieth Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show John Rieth reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Iowa City, IA 52242
- Reassigned Medicare billing, Iowa enrollment
- 2,190 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 6
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
University Of Iowa Health Care Medical Center Down
Acute Care Hospitals · Iowa City, IASt Lukes Hospital
Acute Care Hospitals · Cedar Rapids, IAUniversity Of Iowa Hospital & Clinics
Acute Care Hospitals · Iowa City, IARegional Medical Center
Critical Access Hospitals · Manchester, IAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 52242 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
IOWA CITY, IA 52242
IOWA CITY, IA 52242
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is John Rieth's NPI number?
The NPI number for John Rieth is 1528559937. It was assigned to this individual provider in the NPPES registry on May 21, 2018.
Where is John Rieth located?
John Rieth practices at 200 Hawkins Dr, Iowa City, IA 52242. The listed phone number is (319) 356-3077.
What is John Rieth's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Medical Oncology, with taxonomy code 207RX0202X.
Is John Rieth enrolled in Medicare?
Yes. John Rieth is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for John Rieth's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Rieth reassigns Medicare benefits to State University Of Iowa (Iowa City, IA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for John Rieth's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does John Rieth accept?
Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from NH Healthy Families, Ambetter from Sunflower Health Plan and Oscar Insurance Company and 2 other insurers list John Rieth as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is John Rieth affiliated with any hospitals?
According to CMS data, John Rieth is affiliated with University Of Iowa Health Care Medical Center Down, St Lukes Hospital, University Of Iowa Hospital & Clinics and Regional Medical Center.
When was this NPI record last updated?
The NPPES record for John Rieth was last updated on July 22, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. John Markus Rieth, MD · NPI 1528559937
Medical Oncology physician in Iowa City, Iowa. Individual provider, active in the CMS NPPES registry since May 21, 2018.
## Identity
- **NPI:** 1528559937 (Entity type: Individual)
- **Enumerated:** May 21, 2018
- **Primary specialty:** Internal Medicine - Medical Oncology · taxonomy 207RX0202X
- **State license:** MD-48661 (Iowa)
- **Sole proprietor:** No
## Practice location
- **Address:** 200 HAWKINS DR, Iowa City, IA 52242-1009
- **Phone:** (319) 356-3077 · **Fax:** (319) 353-8383
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** State University Of Iowa (NPI 1114905387, Iowa City, IA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Indiana University School Of Medicine, class of 2018
## Record status
- **NPPES last updated:** July 22, 2023
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Source: [NPI Profile](https://npiprofile.com/npi/1528559937) · Data from the CMS NPPES public registry.