DR. MICHAEL H TOMASSON MD
NPI 1841216157
Internal Medicine - Hematology in Iowa City, IA
About Dr. Michael H Tomasson Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MICHAEL H TOMASSON MD (NPI 1841216157) is an individual hematology provider in Iowa City, Iowa, licensed in Iowa (MD-43803) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS, is affiliated with University Of Iowa Hospital & Clinics, and is a graduate of Stanford University School Of Medicine (1992).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
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. Michael H Tomasson 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 Reassignments
2Medicare enrollment records show Michael Tomasson reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Iowa City, IA 52242
- Reassigned Medicare billing, Iowa enrollment
- 2,190 clinicians in this Medicare group
Saint Louis, MO 63110
- Reassigned Medicare billing, Missouri enrollment
- 1,133 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
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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
University Of Iowa Hospital & Clinics
Acute Care Hospitals · Iowa City, 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 Michael Tomasson's NPI number?
The NPI number for Michael Tomasson is 1841216157. It was assigned to this individual provider in the NPPES registry on July 14, 2006.
Where is Michael Tomasson located?
Michael Tomasson practices at 200 Hawkins Dr Dept Of Internal Medicine, Iowa City, IA 52242. The listed phone number is (319) 335-4958.
What is Michael Tomasson's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology, with taxonomy code 207RH0000X.
Is Michael Tomasson enrolled in Medicare?
Yes. Michael Tomasson 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 organizations bill Medicare for Michael Tomasson's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Michael Tomasson reassigns Medicare benefits to 2 organizations: State University Of Iowa (Iowa City, IA) and Washington University (Saint Louis, MO). Each 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 Michael Tomasson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Michael Tomasson 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 Michael Tomasson 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 Michael Tomasson affiliated with any hospitals?
According to CMS data, Michael Tomasson is affiliated with University Of Iowa Hospital & Clinics.
When was this NPI record last updated?
The NPPES record for Michael Tomasson was last updated on September 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 22 days 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. Michael H Tomasson, MD · NPI 1841216157
Hematology physician in Iowa City, Iowa. Individual provider, active in the CMS NPPES registry since July 14, 2006.
## Identity
- **NPI:** 1841216157 (Entity type: Individual)
- **Enumerated:** July 14, 2006
- **Primary specialty:** Internal Medicine - Hematology · taxonomy 207RH0000X
- **State license:** MD-43803 (Iowa)
- **Sole proprietor:** No
## Practice location
- **Address:** 200 HAWKINS DR, DEPT OF INTERNAL MEDICINE, Iowa City, IA 52242-1009
- **Phone:** (319) 335-4958
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): State University Of Iowa (NPI 1114905387, Iowa City, IA); Washington University (NPI 1992746903, Saint Louis, MO) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Stanford University School Of Medicine, class of 1992
## Record status
- **NPPES last updated:** September 29, 2026
- **Other identifiers:** Medicaid 025410183 (MO)
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Source: [NPI Profile](https://npiprofile.com/npi/1841216157) · Data from the CMS NPPES public registry.