DIAMOND GASTROENTEROLOGY SC
NPI 1043624752
Internal Medicine - Gastroenterology in Oak Park, IL
About Diamond Gastroenterology Sc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DIAMOND GASTROENTEROLOGY SC (NPI 1043624752) is a healthcare organization registered as a gastroenterology in Oak Park, Illinois and active in the NPI registry since June 2014. The organization maintains 2 additional practice locations and lists Ilysa Diamond, Owner, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 2
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Diamond Gastroenterology Sc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
Medicare enrollment records show 1 clinician reassigns Medicare billing to Diamond Gastroenterology Sc, which bills Medicare for the services this clinician delivers.
Clinician (1)
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 Diamond Gastroenterology Sc's NPI number?
The NPI number for Diamond Gastroenterology Sc is 1043624752. It was assigned to this organization in the NPPES registry on June 20, 2014.
Where is Diamond Gastroenterology Sc located?
Diamond Gastroenterology Sc is located at 1010 Lake St Ste 424, Oak Park, IL 60301. The listed phone number is (708) 613-4417.
What is Diamond Gastroenterology Sc's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.
Is Diamond Gastroenterology Sc enrolled in Medicare?
Yes. Diamond Gastroenterology Sc is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Diamond Gastroenterology Sc?
According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Gastroenterology) reassigns their Medicare billing to Diamond Gastroenterology Sc. A 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 the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
When was this NPI record last updated?
The NPPES record for Diamond Gastroenterology Sc was last updated on August 2, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Diamond Gastroenterology Sc · NPI 1043624752
Gastroenterology organization in Oak Park, Illinois. Organization record, active in the CMS NPPES registry since June 20, 2014.
## Identity
- **NPI:** 1043624752 (Entity type: Organization)
- **Enumerated:** June 20, 2014
- **Primary specialty:** Internal Medicine - Gastroenterology · taxonomy 207RG0100X
- **Organization subpart:** No
- **Authorized official:** Ilysa Diamond, OWNER
## Practice location
- **Address:** 1010 LAKE ST STE 424, Oak Park, IL 60301-1185
- **Phone:** (708) 613-4417
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 1 clinician (Gastroenterology) reassigns Medicare billing to this organization (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** August 2, 2023
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Source: [NPI Profile](https://npiprofile.com/npi/1043624752) · Data from the CMS NPPES public registry.