EILEEN CASTILLO GAJO MD
NPI 1083091946
Internal Medicine - Cardiovascular Disease in Evanston, IL
About Eileen Castillo Gajo Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
EILEEN CASTILLO GAJO MD (NPI 1083091946) is an individual cardiovascular disease provider in Evanston, Illinois, licensed in California (A195889) and active in the NPI registry since April 2015. She is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of Other (2015).
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Locations 2
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
Eileen Castillo Gajo Md 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
7Medicare enrollment records show Eileen Gajo reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Evanston, IL 60201
- Reassigned Medicare billing, Illinois enrollment
- 4,841 clinicians in this Medicare group
Chicago, IL 60612
- Reassigned Medicare billing, Illinois enrollment
- Medicare enrollment name: Rush University Medical Group
- 2,169 clinicians in this Medicare group
Oak Park, IL 60304
- Reassigned Medicare billing, Illinois enrollment
- 51 clinicians in this Medicare group
El Cajon, CA 92020
- Reassigned Medicare billing, California enrollment
- 1,100 clinicians in this Medicare group
Chula Vista, CA 91911
- Reassigned Medicare billing, California enrollment
- 29 clinicians in this Medicare group
San Diego, CA 92123
- Reassigned Medicare billing, California enrollment
- 1,437 clinicians in this Medicare group
Yuba City, CA 95991
- Reassigned Medicare billing, California enrollment
- 20 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 60201 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.
EVANSTON, IL 60201
EVANSTON, IL 60201
EVANSTON, IL 60201
EVANSTON, IL 60201
EVANSTON, IL 60201
EVANSTON, IL 60201
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 Eileen Gajo's NPI number?
The NPI number for Eileen Gajo is 1083091946. It was assigned to this individual provider in the NPPES registry on April 29, 2015.
Where is Eileen Gajo located?
Eileen Gajo practices at 2650 Ridge Ave, Evanston, IL 60201. The listed phone number is (847) 570-2509.
What is Eileen Gajo's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Cardiovascular Disease, with taxonomy code 207RC0000X.
Is Eileen Gajo enrolled in Medicare?
Yes. Eileen Gajo 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 Eileen Gajo's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Eileen Gajo reassigns Medicare benefits to 7 organizations: Endeavor Health Medical Group (Evanston, IL), Rush University Medical Center (Chicago, IL), Rush Oak Park Physicians Group Adult Medicine (Oak Park, IL), Family Health Centers Of San Diego, Inc. (El Cajon, CA), Cardiovascular Institute Of San Diego Inc (Chula Vista, CA) and 2 more organizations, listed in the Medicare section above. 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 Eileen Gajo's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Eileen Gajo was last updated on July 7, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.
# Eileen Castillo Gajo, MD · NPI 1083091946
Cardiovascular Disease physician in Evanston, Illinois. Individual provider, active in the CMS NPPES registry since April 29, 2015.
## Identity
- **NPI:** 1083091946 (Entity type: Individual)
- **Enumerated:** April 29, 2015
- **Primary specialty:** Internal Medicine - Cardiovascular Disease · taxonomy 207RC0000X
- **State license:** A195889 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 2650 RIDGE AVE, Evanston, IL 60201
- **Phone:** (847) 570-2509
## 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:** 7 organizations under Medicare reassignment (form CMS-855R): Endeavor Health Medical Group (NPI 1265695944, Evanston, IL); Rush University Medical Center (NPI 1184269425, Chicago, IL); Rush Oak Park Physicians Group Adult Medicine (NPI 1548531924, Oak Park, IL); Family Health Centers Of San Diego, Inc. (NPI 1932561198, El Cajon, CA); Cardiovascular Institute Of San Diego Inc (NPI 1558518753, Chula Vista, CA); and 2 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2015
## Record status
- **NPPES last updated:** July 7, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1083091946) · Data from the CMS NPPES public registry.