DR. JOHN MICHAEL SULLIVAN MD
NPI 1922685916
Emergency Medicine in Chicago, IL
About Dr. John Michael Sullivan Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JOHN MICHAEL SULLIVAN MD (NPI 1922685916) is an individual emergency medicine provider in Chicago, Illinois, licensed in Connecticut (81236) and active in the NPI registry since March 2021. He is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of Other (2021).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 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 (PECOS)
Dr. John Michael Sullivan Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
5Medicare enrollment records show John Sullivan reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Chicago, IL 60657
- Reassigned Medicare billing, Illinois enrollment
- 982 clinicians in this Medicare group
Waterbury, CT 06706
- Reassigned Medicare billing, Connecticut enrollment
- 100 clinicians in this Medicare group
Hartford, CT 06106
- Reassigned Medicare billing, Connecticut enrollment
- 1,921 clinicians in this Medicare group
Hartford, CT 06102
- Reassigned Medicare billing, Connecticut enrollment
- 1,333 clinicians in this Medicare group
Springfield, MA 01104
- Reassigned Medicare billing, Massachusetts enrollment
- 62 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 4
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60611 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.
CHICAGO, IL 60611
CHICAGO, IL 60611
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 John Sullivan's NPI number?
The NPI number for John Sullivan is 1922685916. It was assigned to this individual provider in the NPPES registry on March 25, 2021.
Where is John Sullivan located?
John Sullivan practices at 251 E Huron St, Chicago, IL 60611. The listed phone number is (312) 926-2000.
What is John Sullivan's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is John Sullivan enrolled in Medicare?
Yes. John Sullivan is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for John Sullivan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Sullivan reassigns Medicare benefits to 5 organizations: Cepamerica Illinois LLP (Chicago, IL), Cep America LLC (Waterbury, CT), Hartford Healthcare Medical Group Specialists, PLLC (Hartford, CT), Hartford Hospital (Hartford, CT) and Vituity-Massachusetts PLLC (Springfield, MA). 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 John Sullivan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does John Sullivan accept?
Health plans from WellSense Health Plan list John Sullivan 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 John Sullivan was last updated on March 24, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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. John Michael Sullivan, MD · NPI 1922685916
Emergency Medicine physician in Chicago, Illinois. Individual provider, active in the CMS NPPES registry since March 25, 2021.
## Identity
- **NPI:** 1922685916 (Entity type: Individual)
- **Enumerated:** March 25, 2021
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 81236 (Connecticut)
- **Sole proprietor:** No
## Practice location
- **Address:** 251 E HURON ST, Chicago, IL 60611-2908
- **Phone:** (312) 926-2000
## 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:** 5 organizations under Medicare reassignment (form CMS-855R): Cepamerica Illinois LLP (NPI 1134677370, Chicago, IL); Cep America LLC (NPI 1700681202, Waterbury, CT); Hartford Healthcare Medical Group Specialists, PLLC (NPI 1023584216, Hartford, CT); Hartford Hospital (NPI 1770696643, Hartford, CT); Vituity-Massachusetts PLLC (NPI 1083404313, Springfield, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2021
## Record status
- **NPPES last updated:** March 24, 2026
---
Source: [NPI Profile](https://npiprofile.com/npi/1922685916) · Data from the CMS NPPES public registry.