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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

BRETT JAMES CASSIDY MD
NPI 1649256975
Obstetrics & Gynecology in Sandwich, IL

Active since December 19, 2005PECOS EnrolledAccepts Medicare Assignment
831 SANDHURST DR, SANDWICH, IL 60548(815) 786-1088(815) 786-1314 Get Directions Write a Review

NPPES record last updated: October 13, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Brett James Cassidy Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

BRETT JAMES CASSIDY MD (NPI 1649256975) is an individual obstetrics & gynecology provider in Sandwich, Illinois, licensed in Illinois (036102977) and active in the NPI registry since December 2005. He is enrolled in Medicare PECOS, is affiliated with Copley Memorial Hospital, and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1649256975
Entity TypeIndividualMale
Primary Taxonomy207V00000X
Provider Legal NameBRETT JAMES CASSIDYCredential: MD
Location Address831 SANDHURST DRSandwich, IL 60548-1390
Mailing Address831 Sandhurst DrSandwich, IL 60548-1390 · (815) 786-1088 · Fax (815) 786-1314
Phone(815) 786-1088
Fax(815) 786-1314
Sole ProprietorNo
Medical School CMSEmory University School Of MedicineGraduated 1998
Enumeration DateDecember 19, 2005
Last NPPES UpdateOctober 13, 2026
NPPES CertifiedOctober 13, 2026
✔ NPI 1649256975 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians
Taxonomy Code207V00000X
License✔ Licensed in IL · 036102977
Definition
An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women.
831 SANDHURST DR, Sandwich, IL 60548
Open in Google Maps ↗

Secondary Practice Locations 2

Location 1654 W Veterans Pkwy Ste AYorkville, IL 60560-2510 · Phone (630) 553-3588 · Fax (630) 553-3525
Location 224023 W Lockport St Ste 101Plainfield, IL 60544-1766 · Phone (815) 577-2840 · Fax (815) 577-2845

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter Health, Ambetter Health of Delaware, Oscar Health.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

Brett James Cassidy 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.

PECOS PAC ID42309197
PECOS Enrollment IDI20071128000050
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show Brett Cassidy reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Fox Valley Vein Centers, P.C.
Same address
Clinic/Center
831 SANDHURST DR
Sandwich, IL 60548
  • Reassigned Medicare billing, Illinois enrollment
  • 2 clinicians in this Medicare group
NPI 1114155983 (815) 786-3222
Osf Multi-Specialty Group
81 mi
Internal Medicine
8600 N STATE ROUTE 91
Peoria, IL 61615
  • Reassigned Medicare billing, Illinois enrollment
  • 2,944 clinicians in this Medicare group
NPI 1154908929 (309) 683-5050

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 2

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203
This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.
28 services28 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
26 services20 patients

Hospital Affiliations CMS Care Compare 3

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Copley Memorial Hospital

Acute Care Hospitals · Aurora, IL
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140029
Location2000 Ogden AvenueAurora, IL 60504 · Kane County
Emergency services Birthing friendly

Osf Saint Elizabeth Mdl Ctr

Acute Care Hospitals · Ottawa, IL
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140110
Location1100 E Norris DriveOttawa, IL 61350 · La Salle County
Emergency services Birthing friendly

Presence Mercy Medical Center

Acute Care Hospitals · Aurora, IL
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140174
Location1325 N Highland AvenueAurora, IL 60506 · Kane County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60548 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$127.46 typical visit price
range $54.80 – $168.44
Typical copayment $31.86 (range $13.70 – $42.11)
Most-billed visit code 99204
Established Patient
$68.64 typical visit price
range $17.16 – $136.56
Typical copayment $17.16 (range $4.29 – $34.14)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 8

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

JILL M PALKO M.D.
Obstetrics & Gynecology
831 SANDHURST DR
SANDWICH, IL 60548
Dekalb County (815) 786-1088
FOX VALLEY VEIN CENTERS, P.C.
Clinic/Center
831 SANDHURST DR
SANDWICH, IL 60548
Dekalb County (815) 786-3222
STEPHANIE WINN WHNP
Clinical Nurse Specialist (Women's Health)
831 SANDHURST DR
SANDWICH, IL 60548
Dekalb County (815) 789-1088
DR. BRYAN RICHARD SWEENEY D.O.
Obstetrics & Gynecology
831 SANDHURST DR
SANDWICH, IL 60548
Dekalb County (815) 786-1088
AISHLING OBSTETRICS AND GYNECOLOGY, S.C.
Obstetrics & Gynecology
831 SANDHURST DR
SANDWICH, IL 60548
Dekalb County (815) 786-1088
DR. JAMES N HAWKINS D.O.
Obstetrics & Gynecology
831 SANDHURST DR
SANDWICH, IL 60548
Dekalb County (815) 786-1088
LESLIE ANN OLIVER CNM, APRN
Midwife
831 SANDHURST DR
SANDWICH, IL 60548
Dekalb County (815) 786-1088
FOXLAND RESPIRATORY CONSULTANTS, S.C.
Internal Medicine (Pulmonary Disease)
831 SANDHURST DR, SUITE 2
SANDWICH, IL 60548
Dekalb County (815) 786-3060

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 Brett Cassidy's NPI number?

The NPI number for Brett Cassidy is 1649256975. It was assigned to this individual provider in the NPPES registry on December 19, 2005.

Where is Brett Cassidy located?

Brett Cassidy practices at 831 Sandhurst Dr, Sandwich, IL 60548. The listed phone number is (815) 786-1088.

What is Brett Cassidy's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Is Brett Cassidy enrolled in Medicare?

Yes. Brett Cassidy 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 Brett Cassidy's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Brett Cassidy reassigns Medicare benefits to 2 organizations: Fox Valley Vein Centers, P.C. (Sandwich, IL) and Osf Multi-Specialty Group (Peoria, IL). 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 Brett Cassidy's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Brett Cassidy accept?

Health plans from Ambetter Health, Ambetter Health of Delaware and Oscar Health list Brett Cassidy 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 Brett Cassidy affiliated with any hospitals?

According to CMS data, Brett Cassidy is affiliated with Copley Memorial Hospital, Osf Saint Elizabeth Mdl Ctr and Presence Mercy Medical Center.

When was this NPI record last updated?

The NPPES record for Brett Cassidy was last updated on October 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 days 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.