ILKA DECKER M.D.
NPI 1891138616
Internal Medicine - Nephrology in Ann Arbor, MI
About Ilka Decker M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ILKA DECKER M.D. (NPI 1891138616) is an individual nephrology provider in Ann Arbor, Michigan, licensed in Michigan (4301109103) and active in the NPI registry since April 2013. She is enrolled in Medicare PECOS, is affiliated with University Of Michigan Health System, and is a graduate of Clvlnd Clinic Lerner College Of Med Of Case Wstn Rsv University (2013).
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
Ilka Decker M.d. 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 Ilka Decker reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Ann Arbor, MI 48109
- Reassigned Medicare billing, Michigan enrollment
- 96 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 5
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.
University Of Michigan Health System
Acute Care Hospitals · Ann Arbor, MIBronson Battle Creek Hospital
Acute Care Hospitals · Battle Creek, MIPhysician 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.
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
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 Ilka Decker's NPI number?
The NPI number for Ilka Decker is 1891138616. It was assigned to this individual provider in the NPPES registry on April 11, 2013.
Where is Ilka Decker located?
Ilka Decker practices at 1500 East Medical Center Dr 3rd Floor Taubman Center Recp C, Ann Arbor, MI 48109. The listed phone number is (734) 936-5548.
What is Ilka Decker's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.
Is Ilka Decker enrolled in Medicare?
Yes. Ilka Decker 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 Ilka Decker's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ilka Decker reassigns Medicare benefits to Regents Of The University Of Michigan (Ann Arbor, MI). 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 Ilka Decker's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Ilka Decker accept?
Health plans from Blue Care Network of Michigan, Blue Cross Blue Shield of Michigan Mutual Insurance Company and Priority Health list Ilka Decker 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 Ilka Decker affiliated with any hospitals?
According to CMS data, Ilka Decker is affiliated with University Of Michigan Health System and Bronson Battle Creek Hospital.
When was this NPI record last updated?
The NPPES record for Ilka Decker was last updated on February 5, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.
# Ilka Decker, M.D. · NPI 1891138616
Nephrology physician in Ann Arbor, Michigan. Individual provider, active in the CMS NPPES registry since April 11, 2013.
## Identity
- **NPI:** 1891138616 (Entity type: Individual)
- **Enumerated:** April 11, 2013
- **Primary specialty:** Internal Medicine - Nephrology · taxonomy 207RN0300X
- **State license:** 4301109103 (Michigan)
- **Sole proprietor:** No
## Practice location
- **Address:** 1500 EAST MEDICAL CENTER DR, 3RD FLOOR TAUBMAN CENTER RECP C, Ann Arbor, MI 48109-5364
- **Phone:** (734) 936-5548
## 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:** Regents Of The University Of Michigan (NPI 1003848144, Ann Arbor, MI), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Clvlnd Clinic Lerner College Of Med Of Case Wstn Rsv University, class of 2013
## Record status
- **NPPES last updated:** February 5, 2020
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Source: [NPI Profile](https://npiprofile.com/npi/1891138616) · Data from the CMS NPPES public registry.