DR. CHARLES B SIEDLECKI MD
NPI 1588023113
Internal Medicine in Ann Arbor, MI
About Dr. Charles B Siedlecki Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. CHARLES B SIEDLECKI MD (NPI 1588023113) is an individual internal medicine provider in Ann Arbor, Michigan, licensed in Michigan (4301501950) and active in the NPI registry since February 2016. He is enrolled in Medicare PECOS, is affiliated with University Of Michigan Health System, and is a graduate of Indiana University School Of Medicine (2017).
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. Charles B Siedlecki 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
3Medicare enrollment records show Charles Siedlecki reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Ann Arbor, MI 48109
- Reassigned Medicare billing, Michigan enrollment
- 2,377 clinicians in this Medicare group
Ann Arbor, MI 48105
- Reassigned Medicare billing, Michigan enrollment
- 1,480 clinicians in this Medicare group
Chelsea, MI 48118
- Reassigned Medicare billing, Michigan enrollment
- 147 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 Michigan Health System
Acute Care Hospitals · Ann Arbor, 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
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 Charles Siedlecki's NPI number?
The NPI number for Charles Siedlecki is 1588023113. It was assigned to this individual provider in the NPPES registry on February 10, 2016.
Where is Charles Siedlecki located?
Charles Siedlecki practices at 1500 E Medical Center Dr, Ann Arbor, MI 48109. The listed phone number is (734) 936-4000.
What is Charles Siedlecki's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Charles Siedlecki enrolled in Medicare?
Yes. Charles Siedlecki 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 Charles Siedlecki's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Charles Siedlecki reassigns Medicare benefits to 3 organizations: Regents Of The University Of Michigan (Ann Arbor, MI), Iha Health Services Corporation (Ann Arbor, MI) and Chelsea Community Hospital (Chelsea, MI). 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 Charles Siedlecki's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Charles Siedlecki accept?
Health plans from Ambetter Health, Ambetter from Buckeye Health Plan, Ambetter from Meridian, Blue Care Network of Michigan and Blue Cross Blue Shield of Michigan Mutual Insurance Company and 1 other insurer list Charles Siedlecki 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 Charles Siedlecki affiliated with any hospitals?
According to CMS data, Charles Siedlecki is affiliated with University Of Michigan Health System.
When was this NPI record last updated?
The NPPES record for Charles Siedlecki was last updated on June 30, 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.
# Dr. Charles B Siedlecki, MD · NPI 1588023113
Internal Medicine physician in Ann Arbor, Michigan. Individual provider, active in the CMS NPPES registry since February 10, 2016.
## Identity
- **NPI:** 1588023113 (Entity type: Individual)
- **Enumerated:** February 10, 2016
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 4301501950 (Michigan)
- **Sole proprietor:** No
## Practice location
- **Address:** 1500 E MEDICAL CENTER DR, Ann Arbor, MI 48109-5000
- **Phone:** (734) 936-4000
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Regents Of The University Of Michigan (NPI 1003848144, Ann Arbor, MI); Iha Health Services Corporation (NPI 1013194307, Ann Arbor, MI); Chelsea Community Hospital (NPI 1912947409, Chelsea, MI) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Indiana University School Of Medicine, class of 2017
## Record status
- **NPPES last updated:** June 30, 2020
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Source: [NPI Profile](https://npiprofile.com/npi/1588023113) · Data from the CMS NPPES public registry.