DR. RYAN BERNARD MITACEK MD
NPI 1639674211
Pediatrics - Pediatric Rheumatology in Chicago, IL
About Dr. Ryan Bernard Mitacek Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. RYAN BERNARD MITACEK MD (NPI 1639674211) is an individual pediatric rheumatology provider in Chicago, Illinois, licensed in Illinois (036.155959) and active in the NPI registry since March 2018. He is enrolled in Medicare PECOS, maintains a secondary practice location in Detroit, and is a graduate of Other (2017).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 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. Ryan Bernard Mitacek 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 Ryan Mitacek reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Chicago, IL 60637
- Reassigned Medicare billing, Illinois enrollment
- 1,905 clinicians in this Medicare group
Chicago, IL 60637
- Reassigned Medicare billing, Illinois enrollment
- 2,237 clinicians in this Medicare group
Detroit, MI 48201
- Reassigned Medicare billing, Michigan enrollment
- 360 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.
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 Ryan Mitacek's NPI number?
The NPI number for Ryan Mitacek is 1639674211. It was assigned to this individual provider in the NPPES registry on March 27, 2018.
Where is Ryan Mitacek located?
Ryan Mitacek practices at 5841 S Maryland Ave # Mc5044, Chicago, IL 60637. The listed phone number is (773) 702-1000.
What is Ryan Mitacek's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Rheumatology, with taxonomy code 2080P0216X.
Is Ryan Mitacek enrolled in Medicare?
Yes. Ryan Mitacek 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 Ryan Mitacek's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ryan Mitacek reassigns Medicare benefits to 3 organizations: The University Of Chicago Medical Center (Chicago, IL), University Of Chicago (Chicago, IL) and University Pediatricians (Detroit, 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 Ryan Mitacek's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Ryan Mitacek accept?
Health plans from Blue Care Network of Michigan, Blue Cross Blue Shield of Michigan Mutual Insurance Company, McLaren Health Plan Community, Priority Health and UnitedHealthcare list Ryan Mitacek 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.
When was this NPI record last updated?
The NPPES record for Ryan Mitacek was last updated on April 12, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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. Ryan Bernard Mitacek, MD · NPI 1639674211
Pediatric Rheumatology physician in Chicago, Illinois. Individual provider, active in the CMS NPPES registry since March 27, 2018.
## Identity
- **NPI:** 1639674211 (Entity type: Individual)
- **Enumerated:** March 27, 2018
- **Primary specialty:** Pediatrics - Pediatric Rheumatology · taxonomy 2080P0216X
- **State license:** 036.155959 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 5841 S MARYLAND AVE # MC5044, Chicago, IL 60637-1443
- **Phone:** (773) 702-1000
## 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): The University Of Chicago Medical Center (NPI 1033218128, Chicago, IL); University Of Chicago (NPI 1821048786, Chicago, IL); University Pediatricians (NPI 1033143904, Detroit, MI) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2017
## Record status
- **NPPES last updated:** April 12, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1639674211) · Data from the CMS NPPES public registry.