NICHOLAS G BAUR
NPI 1144783309
Internal Medicine - Gastroenterology in Olympia Fields, IL
About Nicholas G Baur NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
NICHOLAS G BAUR (NPI 1144783309) is an individual gastroenterology provider in Olympia Fields, Illinois, licensed in Illinois (036.175190) and active in the NPI registry since April 2019. He is enrolled in Medicare PECOS, is affiliated with Javon Bea Hospital, and maintains 3 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 3
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
Nicholas G Baur 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 Nicholas Baur reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Harvard, IL 60033
- Reassigned Medicare billing, Illinois enrollment
- 382 clinicians in this Medicare group
Rockford, IL 61114
- Reassigned Medicare billing, Illinois enrollment
- 1,375 clinicians in this Medicare group
Lake Geneva, WI 53147
- Reassigned Medicare billing, Wisconsin and Illinois enrollments
- Also billed through NPI 1598718603 (Wisconsin)
- 271 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.
Hospital Affiliations CMS Care Compare 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Javon Bea Hospital
Acute Care Hospitals · Rockford, ILMercyhealth Hospital & Physician Clinic-Crystal La
Acute Care Hospitals · Crystal Lake, ILMercy Harvard Hospital
Critical Access Hospitals · Harvard, ILMercy Health System Corp
Acute Care Hospitals · Janesville, WIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60461 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.
OLYMPIA FIELDS, IL 60461
OLYMPIA FIELDS, IL 60461
OLYMPIA FIELDS, IL 60461
OLYMPIA FIELDS, IL 60461
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 Nicholas Baur's NPI number?
The NPI number for Nicholas Baur is 1144783309. It was assigned to this individual provider in the NPPES registry on April 12, 2019.
Where is Nicholas Baur located?
Nicholas Baur practices at 20201 Crawford Ave, Olympia Fields, IL 60461. The listed phone number is (708) 747-4000.
What is Nicholas Baur's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.
Is Nicholas Baur enrolled in Medicare?
Yes. Nicholas Baur 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 Nicholas Baur's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Nicholas Baur reassigns Medicare benefits to 3 organizations: Mercy Harvard Hospital Inc (Harvard, IL), Rockford Health Physicians (Rockford, IL) and Mercy Health System Corporation (Lake Geneva, WI). 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 Nicholas Baur's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Nicholas Baur accept?
Health plans from Anthem Blue Cross and Blue Shield, MercyCare and MercyCare Health Plans list Nicholas Baur 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 Nicholas Baur affiliated with any hospitals?
According to CMS data, Nicholas Baur is affiliated with Javon Bea Hospital, Mercyhealth Hospital & Physician Clinic-Crystal La, Mercy Harvard Hospital and Mercy Health System Corp.
When was this NPI record last updated?
The NPPES record for Nicholas Baur was last updated on June 19, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Nicholas G Baur · NPI 1144783309
Gastroenterology physician in Olympia Fields, Illinois. Individual provider, active in the CMS NPPES registry since April 12, 2019.
## Identity
- **NPI:** 1144783309 (Entity type: Individual)
- **Enumerated:** April 12, 2019
- **Primary specialty:** Internal Medicine - Gastroenterology · taxonomy 207RG0100X
- **State license:** 036.175190 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 20201 CRAWFORD AVE, Olympia Fields, IL 60461-1010
- **Phone:** (708) 747-4000
## 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): Mercy Harvard Hospital Inc (NPI 1427001445, Harvard, IL); Rockford Health Physicians (NPI 1043242886, Rockford, IL); Mercy Health System Corporation (NPI 1699728550, Lake Geneva, WI) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2019
## Record status
- **NPPES last updated:** June 19, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1144783309) · Data from the CMS NPPES public registry.