DR. MARY CATHERINE DEMENT DO
NPI 1619437738
Internal Medicine - Gastroenterology in Elgin, IL
About Dr. Mary Catherine Dement Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARY CATHERINE DEMENT DO (NPI 1619437738) is an individual gastroenterology provider in Elgin, Illinois, licensed in Illinois (036.157934) and active in the NPI registry since March 2019. She is enrolled in Medicare PECOS, is affiliated with Advocate Sherman Hospital, and is a graduate of Chicago College Of Osteopathy (2019).
NPPES Registry Identity
Specialties & Licenses 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 and accepts Medicare assignment
Dr. Mary Catherine Dement Do 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 Reassignment
Medicare enrollment records show Mary Dement reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Elgin, IL 60123
- Reassigned Medicare billing, Illinois enrollment
- 235 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 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Advocate Sherman Hospital
Acute Care Hospitals · Elgin, ILPresence Saint Joseph Hospital - Elgin
Acute Care Hospitals · Elgin, ILNorthwestern Medicine Central Dupage Hospital
Acute Care Hospitals · Winfield, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60123 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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 Mary Dement's NPI number?
The NPI number for Mary Dement is 1619437738. It was assigned to this individual provider in the NPPES registry on March 24, 2019.
Where is Mary Dement located?
Mary Dement practices at 745 Fletcher Dr. Suite 202, Elgin, IL 60123. The listed phone number is (847) 888-1300.
What is Mary Dement's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.
Is Mary Dement enrolled in Medicare?
Yes. Mary Dement 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 organization bills Medicare for Mary Dement's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mary Dement reassigns Medicare benefits to Illinois Gastroenterology Group, LLC (Elgin, IL). The 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 Mary Dement's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mary Dement accept?
Health plans from Ambetter Health list Mary Dement 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 Mary Dement affiliated with any hospitals?
According to CMS data, Mary Dement is affiliated with Advocate Sherman Hospital, Presence Saint Joseph Hospital - Elgin and Northwestern Medicine Central Dupage Hospital.
When was this NPI record last updated?
The NPPES record for Mary Dement was last updated on July 10, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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. Mary Catherine Dement, DO · NPI 1619437738
Gastroenterology physician in Elgin, Illinois. Individual provider, active in the CMS NPPES registry since March 24, 2019.
## Identity
- **NPI:** 1619437738 (Entity type: Individual)
- **Enumerated:** March 24, 2019
- **Primary specialty:** Internal Medicine - Gastroenterology · taxonomy 207RG0100X
- **State license:** 036.157934 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 745 FLETCHER DR., SUITE 202, Elgin, IL 60123
- **Phone:** (847) 888-1300
## 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:** Illinois Gastroenterology Group, LLC (NPI 1316277817, Elgin, IL), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Chicago College Of Osteopathy, class of 2019
## Record status
- **NPPES last updated:** July 10, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1619437738) · Data from the CMS NPPES public registry.