1. Home
  2. Directory
  3. Illinois
  4. Oak Brook
  5. Internal Medicine
  6. NPI Profile

NEPHROLOGY ASSOCIATES OF NORTHERN ILLINOIS, LTD.
NPI 1134319924
Internal Medicine - Nephrology in Oak Brook, IL

Active since July 27, 2007CLIA Certified · 4 labs
120 W 22ND ST, OAK BROOK, IL 60523(630) 573-5000(303) 680-2806 Get Directions Write a Review

NPPES record last updated: August 27, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Mar 6, 2025, Jul 21, 2022, Nov 2, 2021 and 1 more (4 updates tracked since 2021).

About Nephrology Associates Of Northern Illinois, Ltd. NPPES

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

NEPHROLOGY ASSOCIATES OF NORTHERN ILLINOIS, LTD. (NPI 1134319924) is a healthcare organization registered as a nephrology in Oak Brook, Illinois and active in the NPI registry since July 2007. The organization holds 4 active CLIA laboratory certificates, maintains 6 additional practice locations, and lists Manish Tanna, Md, as its authorized official.

NPPES Registry Identity

NPI1134319924
Entity TypeOrganization
Primary Taxonomy207RN0300X
Legal Business NameNEPHROLOGY ASSOCIATES OF NORTHERN ILLINOIS, LTD.
Location Address120 W 22ND STOak Brook, IL 60523-1557
Mailing Address120 W 22nd StOak Brook, IL 60523-1557 · (630) 573-5000 · Fax (630) 368-0280
Phone(630) 573-5000
Fax(303) 680-2806
Organization SubpartNo
Authorized OfficialManish TannaMd · (630) 573-5000
Enumeration DateJuly 27, 2007
Last NPPES UpdateAugust 27, 20254 updates tracked since enumeration
NPPES CertifiedAugust 27, 2025
✔ NPI 1134319924 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · NephrologyAllopathic & Osteopathic Physicians
Taxonomy Code207RN0300X
Definition
An internist who treats disorders of the kidney, high blood pressure, fluid and mineral balance and dialysis of body wastes when the kidneys do not function. This specialist consults with surgeons about kidney transplantation.
120 W 22ND ST, Oak Brook, IL 60523
Open in Google Maps ↗

Secondary Practice Locations 6

Location 12340 S Highland Ave Ste 160Lombard, IL 60148-5395 · Phone (630) 495-9356 · Fax (630) 495-9357
Location 25201 Willow Springs Rd Ste 260LA Grange Highlands, IL 60525-6537 · Phone (708) 354-1306 · Fax (708) 354-1538
Location 3396 Remington Blvd Ste 140Bolingbrook, IL 60440-4311 · Phone (630) 495-9356 · Fax (630) 495-9357
Location 4911 N Elm St Ste 102Hinsdale, IL 60521-3640 · Phone (630) 495-9356 · Fax (630) 495-9357
Location 525 N Winfield Rd Ste 414Winfield, IL 60190-1379 · Phone (630) 690-1220 · Fax (630) 690-5323
Location 6302 Randall Rd Ste 205Geneva, IL 60134-4219 · Phone (630) 690-1220 · Fax (630) 208-1667

Other Identifiers 2

Other1616108IL · Blue Cross Blue Shield
OtherCD3741IL · Rr-group Dupage

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X MULTIPLE SINGLE SPECIALTY GROUP

Accepted Insurance

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

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Nephrology Associates Of Northern Illinois, Ltd. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

160

Medicare enrollment records show 160 clinicians reassign Medicare billing to Nephrology Associates Of Northern Illinois, Ltd., which bills Medicare for the services they deliver. Of these, 1 practice at this address and 41 within 10 miles. Listed here are the 20 practicing nearest to this location.

Clinicians by Medicare Specialty 11

Nephrology101
Nurse Practitioner30
Internal Medicine9
Interventional Radiology6
Certified Registered Nurse Anesthetist (CRNA)5
Diagnostic Radiology3
Hospitalist2
Cardiovascular Disease (Cardiology)1
3 other specialties3

Nearest to this location (20)

See all 160
Arthur Morris, MD
Nephrology
NPI 1033111042
120 W 22ND ST
Oak Brook, IL 60523
(630) 974-5230
✔ PECOS✔ Accepts MedicareSame address
Michael Cohan, MD
Nephrology
NPI 1144271297
133 E BRUSH HILL RD SUITE 310
Elmhurst, IL 60126
(331) 221-9003
✔ PECOS✔ Accepts Medicare1.3 mi
Martin Kittaka, MD
Nephrology
NPI 1649220765
133 E BRUSH HILL RD STE 310
Elmhurst, IL 60126
(331) 221-9003
✔ PECOS✔ Accepts Medicare1.3 mi
Roshan Sher Ali, MD
Nephrology
NPI 1376646828
133 E BRUSH HILL RD STE 310
Elmhurst, IL 60126
(331) 221-9003
✔ PECOS✔ Accepts Medicare1.3 mi
Madhavi Ryali, M.D.
Nephrology
NPI 1356453823
133 E BRUSH HILL RD UNIT 301 NEPHROLOGY ASSOCIATES OF NORTHERN ILLINOIS
Elmhurst, IL 60126
(630) 832-2183
✔ PECOS1.3 mi
Navjyot Bhogal, MD
Nephrology
NPI 1396973103
133 E BRUSH HILL RD STE 310
Elmhurst, IL 60126
(331) 221-9003
✔ PECOS✔ Accepts Medicare1.4 mi
Zahra Deen, M.D.
Nephrology
NPI 1841515137
133 E BRUSH HILL RD UNIT 301
Elmhurst, IL 60126
(630) 832-2183
✔ PECOS✔ Accepts Medicare1.4 mi
George Behrens, M.D.
Interventional Radiology
NPI 1275799876
911 N ELM ST STE 128
Hinsdale, IL 60521
(630) 856-7460
✔ PECOS✔ Accepts Medicare2.0 mi
Maytee Boonyapredee, MD
Internal Medicine
NPI 1235314501
911 N ELM ST STE 102
Hinsdale, IL 60521
(630) 495-9356
✔ PECOS✔ Accepts Medicare2.0 mi
Francis Facchini, MD
Interventional Radiology
NPI 1578503678
911 N ELM ST STE 128
Hinsdale, IL 60521
(630) 856-7460
✔ PECOS✔ Accepts Medicare2.0 mi
David Hahn, MD
Diagnostic Radiology
NPI 1912926353
911 N ELM ST STE 128
Hinsdale, IL 60521
(630) 856-7460
✔ PECOS✔ Accepts Medicare2.0 mi
Clementa Istrata-Iacob
Nurse Practitioner
NPI 1609534635
911 N ELM ST STE 102
Hinsdale, IL 60521
(630) 495-9356
✔ PECOS✔ Accepts Medicare2.0 mi
Anis Rauf, DO
Critical Care (Intensivists)
NPI 1639259740
911 N ELM ST SUITE 102
Hinsdale, IL 60521
(630) 495-9356
✔ PECOS✔ Accepts Medicare2.0 mi
Yvette Rodriguez, NP
Nurse Practitioner
NPI 1134798747
911 N ELM ST STE 102
Hinsdale, IL 60521
(630) 630-4959
✔ PECOS✔ Accepts Medicare2.0 mi
Luke Sewall, MD
Interventional Radiology
NPI 1487672747
911 N ELM ST STE 128
Hinsdale, IL 60521
(630) 856-7460
✔ PECOS✔ Accepts Medicare2.0 mi
Michael Sichlau, MD
Interventional Radiology
NPI 1710927793
911 N ELM ST STE 128
Hinsdale, IL 60521
(630) 856-7460
✔ PECOS✔ Accepts Medicare2.0 mi
Athanasios Vlahos, MD
Interventional Radiology
NPI 1588617757
911 N ELM ST STE 128
Hinsdale, IL 60521
(630) 856-7460
✔ PECOS✔ Accepts Medicare2.0 mi
Rudolph Albores, MD
Internal Medicine
NPI 1285692889
251 N CASS AVE SUITE 100
Westmont, IL 60559
(630) 963-0309
✔ PECOS4.2 mi
David Sachtleben, MD
Internal Medicine
NPI 1861450447
251 N CASS AVE SUITE 100
Westmont, IL 60559
(630) 963-0309
✔ PECOS4.2 mi
Tricia Littig, APN, CNP
Nurse Practitioner
NPI 1407962129
2340 S HIGHLAND AVE STE 160
Lombard, IL 60148
(630) 495-9356
✔ PECOS✔ Accepts Medicare4.6 mi
See all 160 clinicians

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

CLIA Laboratory Certificates CMS CLIA 4

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate for Provider-Performed Microscopy Procedures (PPMP) 14D2062267

Nephrology Associates Of Northern Illinois Ltd · Bolingbrook, IL
Active · expires Jul 14, 2027
CLIA Number14D2062267
Laboratory TypePhysician Office
Certificate Effective DateJuly 15, 2025
Certificate Expiration DateJuly 14, 2027
Laboratory DirectorHuma Rohail M D
Laboratory Phone(630) 495-9356
Laboratory LocationNephrology Associates Of Northern Illinois Ltd396 Remington Blvd, Ste 140, Bolingbrook, IL 60440
CLIA data matches this NPI record on: Address Name Phone
This certificate is issued to a laboratory in which a physician, midlevel practitioner or dentist performs no tests other than the microscopy procedures. This certificate permits the laboratory to also perform waived tests.

Certificate for Provider-Performed Microscopy Procedures (PPMP) 14D2033210

Nephrology Associates Of Northern Il - Nani · Lombard, IL
Active · expires Nov 27, 2027
CLIA Number14D2033210
Laboratory TypePhysician Office
Certificate Effective DateNovember 28, 2025
Certificate Expiration DateNovember 27, 2027
Laboratory DirectorSuneel M. Udani
Laboratory Phone(630) 495-9356
Laboratory LocationNephrology Associates Of Northern Il - Nani2340 S Highland Ave, Ste 160, Lombard, IL 60148
CLIA data matches this NPI record on: Address Phone
This certificate is issued to a laboratory in which a physician, midlevel practitioner or dentist performs no tests other than the microscopy procedures. This certificate permits the laboratory to also perform waived tests.

Certificate for Provider-Performed Microscopy Procedures (PPMP) 14D1091706

Nephrology Associates Of Northern Il - Nani · Hinsdale, IL
Active · expires Nov 22, 2027
CLIA Number14D1091706
Laboratory TypePhysician Office
Certificate Effective DateNovember 23, 2025
Certificate Expiration DateNovember 22, 2027
Laboratory DirectorSuneel M. Udani
Laboratory Phone(630) 495-9356
Laboratory LocationNephrology Associates Of Northern Il - Nani911 N Elm St, Ste 102, Hinsdale, IL 60523
CLIA data matches this NPI record on: Address Phone
This certificate is issued to a laboratory in which a physician, midlevel practitioner or dentist performs no tests other than the microscopy procedures. This certificate permits the laboratory to also perform waived tests.

Certificate for Provider-Performed Microscopy Procedures (PPMP) 14D0996870

Nephrology Associates Of Northern Il · La Grange, IL
Active · expires Feb 28, 2028
CLIA Number14D0996870
Laboratory TypePhysician Office
Certificate Effective DateFebruary 28, 2026
Certificate Expiration DateFebruary 28, 2028
Laboratory DirectorLeonard D. Potempa MD
Laboratory Phone(708) 354-1306
Laboratory LocationNephrology Associates Of Northern Il5201 S Willow Springs Rd Ste 260, La Grange, IL 60525
CLIA data matches this NPI record on: Name Phone
This certificate is issued to a laboratory in which a physician, midlevel practitioner or dentist performs no tests other than the microscopy procedures. This certificate permits the laboratory to also perform waived tests.

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 Nephrology Associates Of Northern Illinois, Ltd.'s NPI number?

The NPI number for Nephrology Associates Of Northern Illinois, Ltd. is 1134319924. It was assigned to this organization in the NPPES registry on July 27, 2007.

Where is Nephrology Associates Of Northern Illinois, Ltd. located?

Nephrology Associates Of Northern Illinois, Ltd. is located at 120 W 22nd St, Oak Brook, IL 60523. The listed phone number is (630) 573-5000.

What is Nephrology Associates Of Northern Illinois, Ltd.'s specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.

Is Nephrology Associates Of Northern Illinois, Ltd. enrolled in Medicare?

Yes. Nephrology Associates Of Northern Illinois, Ltd. is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Nephrology Associates Of Northern Illinois, Ltd.?

According to the CMS Revalidation Reassignment List (October 2026 release), 160 clinicians in 11 Medicare specialties reassign their Medicare billing to Nephrology Associates Of Northern Illinois, Ltd.. 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. The largest specialties are Nephrology (101), Nurse Practitioner (30) and Internal Medicine (9). Of these, 1 practice at this address and 41 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does Nephrology Associates Of Northern Illinois, Ltd. hold CLIA laboratory certificates?

Yes. 4 active CLIA laboratory certificates are associated with this NPI under the federal Clinical Laboratory Improvement Amendments program. The certificates are listed in the CLIA Laboratory Certificates section above.

What insurance does Nephrology Associates Of Northern Illinois, Ltd. accept?

Health plans from Ambetter Health and Ambetter Health of Delaware list Nephrology Associates Of Northern Illinois, Ltd. 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 Nephrology Associates Of Northern Illinois, Ltd. was last updated on August 27, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.