DR. MARK CHARLES CHOTTINER M.D.
NPI 1821446006
Emergency Medicine in Chicago, IL
About Dr. Mark Charles Chottiner M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARK CHARLES CHOTTINER M.D. (NPI 1821446006) is an individual emergency medicine provider in Chicago, Illinois, licensed in Illinois (125.068459) and active in the NPI registry since May 2016. He is enrolled in Medicare PECOS, is affiliated with The University Of Chicago Medical Center, and maintains a secondary practice location in Baltimore.
NPPES Registry Identity
Specialties & Licenses
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. Mark Charles Chottiner 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 Reassignments
5Medicare enrollment records show Mark Chottiner reassigns Medicare billing to 5 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
Evanston, IL 60201
- Reassigned Medicare billing, Illinois enrollment
- 4,841 clinicians in this Medicare group
Baltimore, MD 21201
- Reassigned Medicare billing, Maryland enrollment
- 234 clinicians in this Medicare group
Baltimore, MD 21202
- Reassigned Medicare billing, Maryland enrollment
- 66 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 3
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.
The University Of Chicago Medical Center
Acute Care Hospitals · Chicago, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60637 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.
CHICAGO, IL 60637
CHICAGO, IL 60637
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 Mark Chottiner's NPI number?
The NPI number for Mark Chottiner is 1821446006. It was assigned to this individual provider in the NPPES registry on May 29, 2016.
Where is Mark Chottiner located?
Mark Chottiner practices at 5841 S Maryland Ave # Mc5068, Chicago, IL 60637. The listed phone number is (773) 702-9500.
What is Mark Chottiner's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Mark Chottiner enrolled in Medicare?
Yes. Mark Chottiner 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 Mark Chottiner's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Chottiner reassigns Medicare benefits to 5 organizations: The University Of Chicago Medical Center (Chicago, IL), University Of Chicago (Chicago, IL), Endeavor Health Medical Group (Evanston, IL), University Of Maryland Emergency Medicine Associates, PA (Baltimore, MD) and Emergency Physicians Spps (Baltimore, MD). 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 Mark Chottiner's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mark Chottiner accept?
Health plans from Oscar Health list Mark Chottiner 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 Mark Chottiner affiliated with any hospitals?
According to CMS data, Mark Chottiner is affiliated with The University Of Chicago Medical Center.
When was this NPI record last updated?
The NPPES record for Mark Chottiner was last updated on April 28, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 months 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. Mark Charles Chottiner, M.D. · NPI 1821446006
Emergency Medicine physician in Chicago, Illinois. Individual provider, active in the CMS NPPES registry since May 29, 2016.
## Identity
- **NPI:** 1821446006 (Entity type: Individual)
- **Enumerated:** May 29, 2016
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 125.068459 (Illinois)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 5841 S MARYLAND AVE # MC5068, Chicago, IL 60637-1447
- **Phone:** (773) 702-9500 · **Fax:** (773) 702-3135
## 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:** 5 organizations under Medicare reassignment (form CMS-855R): The University Of Chicago Medical Center (NPI 1033218128, Chicago, IL); University Of Chicago (NPI 1821048786, Chicago, IL); Endeavor Health Medical Group (NPI 1497701882, Evanston, IL); University Of Maryland Emergency Medicine Associates, PA (NPI 1811704208, Baltimore, MD); Emergency Physicians Spps (NPI 1760885958, Baltimore, MD) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Maryland School Of Medicine, class of 2016
## Record status
- **NPPES last updated:** April 28, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1821446006) · Data from the CMS NPPES public registry.