THEODORE JOHN IWASHYNA MD
NPI 1609939115
Internal Medicine - Critical Care Medicine in Ann Arbor, MI
About Theodore John Iwashyna Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
THEODORE JOHN IWASHYNA MD (NPI 1609939115) is an individual critical care medicine provider in Ann Arbor, Michigan, licensed in Maryland (D95263) and active in the NPI registry since December 2006. He is enrolled in Medicare PECOS, is affiliated with Johns Hopkins Hospital, The, and maintains a secondary practice location in Baltimore.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Theodore John Iwashyna Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Theodore Iwashyna reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Bethesda, MD 20814
- Reassigned Medicare billing, Maryland enrollment
- Also billed through NPI 1689162034 (Maryland)
- 4,483 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 2
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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Johns Hopkins Hospital, The
Acute Care Hospitals · Baltimore, MDJohns Hopkins Bayview Medical Center
Acute Care Hospitals · Baltimore, MDPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 48109 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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.
ANN ARBOR, MI 48109
ANN ARBOR, MI 48109
ANN ARBOR, MI 48109
ANN ARBOR, MI 48109
ANN ARBOR, MI 48109
ANN ARBOR, MI 48109
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 Theodore Iwashyna's NPI number?
The NPI number for Theodore Iwashyna is 1609939115. It was assigned to this individual provider in the NPPES registry on December 18, 2006.
Where is Theodore Iwashyna located?
Theodore Iwashyna practices at 1500 E Medical Center Dr, Ann Arbor, MI 48109. The listed phone number is (734) 936-4000.
What is Theodore Iwashyna's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.
Is Theodore Iwashyna enrolled in Medicare?
Yes. Theodore Iwashyna is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Theodore Iwashyna's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Theodore Iwashyna reassigns Medicare benefits to Johns Hopkins University (Bethesda, MD). 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 Theodore Iwashyna's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Theodore Iwashyna affiliated with any hospitals?
According to CMS data, Theodore Iwashyna is affiliated with Johns Hopkins Hospital, The and Johns Hopkins Bayview Medical Center.
When was this NPI record last updated?
The NPPES record for Theodore Iwashyna was last updated on April 5, 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.
# Theodore John Iwashyna, MD · NPI 1609939115
Critical Care Medicine physician in Ann Arbor, Michigan. Individual provider, active in the CMS NPPES registry since December 18, 2006.
## Identity
- **NPI:** 1609939115 (Entity type: Individual)
- **Enumerated:** December 18, 2006
- **Primary specialty:** Internal Medicine - Critical Care Medicine · taxonomy 207RC0200X
- **State license:** D95263 (Maryland)
- **Sole proprietor:** No
## Practice location
- **Address:** 1500 E MEDICAL CENTER DR, Ann Arbor, MI 48109-5000
- **Phone:** (734) 936-4000
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Johns Hopkins University (NPI 1578569240, Bethesda, MD), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Chicago, Pritzker School Of Medicine, class of 2002
## Record status
- **NPPES last updated:** April 5, 2023
---
Source: [NPI Profile](https://npiprofile.com/npi/1609939115) · Data from the CMS NPPES public registry.