ALLISON ISABELLI DO, MA
NPI 1023713781
Internal Medicine in Oak Lawn, IL
About Allison Isabelli Do, Ma NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ALLISON ISABELLI DO, MA (NPI 1023713781) is an individual internal medicine provider in Oak Lawn, Illinois, licensed in Illinois (036-180079) and active in the NPI registry since April 2023. She is enrolled in Medicare PECOS and is a graduate of Other (2023).
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 (PECOS)
Allison Isabelli Do, Ma is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Allison Isabelli reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Oak Lawn, IL 60453
- Reassigned Medicare billing, Illinois enrollment
- Medicare enrollment name: Advocate Health And Hospitals Corporation
- 4,870 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60453 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.
OAK LAWN, IL 60453
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 Allison Isabelli's NPI number?
The NPI number for Allison Isabelli is 1023713781. It was assigned to this individual provider in the NPPES registry on April 3, 2023.
Where is Allison Isabelli located?
Allison Isabelli practices at 4220 W 95th St Ste 200, Oak Lawn, IL 60453. The listed phone number is (708) 398-0287.
What is Allison Isabelli's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Allison Isabelli enrolled in Medicare?
Yes. Allison Isabelli is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Allison Isabelli's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Allison Isabelli reassigns Medicare benefits to Advocate Health & Hospitals Corporation (Oak Lawn, 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 Allison Isabelli's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Allison Isabelli accept?
Health plans from Ambetter Health and Ambetter Health of Delaware list Allison Isabelli 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 Allison Isabelli was last updated on July 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Allison Isabelli, DO, MA · NPI 1023713781
Internal Medicine physician in Oak Lawn, Illinois. Individual provider, active in the CMS NPPES registry since April 3, 2023.
## Identity
- **NPI:** 1023713781 (Entity type: Individual)
- **Enumerated:** April 3, 2023
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 036-180079 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 4220 W 95TH ST STE 200, Oak Lawn, IL 60453-3072
- **Phone:** (708) 398-0287 · **Fax:** (708) 684-0281
## 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:** Advocate Health & Hospitals Corporation (NPI 1912936014, Oak Lawn, IL), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2023
## Record status
- **NPPES last updated:** July 6, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1023713781) · Data from the CMS NPPES public registry.