Independent US Healthcare Provider Directory & Public Medical Database Patient Guides

Dr. Stuart M Sprague , DO

Internal Medicine - Nephrology โ€ข Evanston, IL

Active NPI 1114947124 Individual Practitioner Male Practitioner Accepts Medicare assignment Telehealth (some services)
Practice location in NPPES

1000 Central St Ste 800
Evanston, IL 602011780

Call 8475702512 Location details and other listings
Medical Disclaimer

This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.

Practice Location & Contact Primary Location

Practice Address

1000 Central St Ste 800

Evanston, IL 602011780

Telephone 8475702512
Fax 8475701696
Other Listings in Public Data

NPPES lists 1 additional practice-address record in Evanston, IL. See the list

Source: CMS NPPES NPI Registry, practice location records; release date unavailable.

CMS Doctors and Clinicians lists 1 group name: Endeavor Health Medical Group. See the list

Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.

Listings do not confirm current availability, employment or a shared ownership network.

Medicare Profile & Education

Source: CMS Doctors and Clinicians National Downloadable File

Medical School

Michigan State University College Of Osteopathic Medicine

Graduation Year

1982

Medicare patients

655 people with Original Medicare in 2024

Different Original Medicare patients in 2024; counts below 11 are hidden; this does not show availability or quality.

Source: CMS, Medicare Physician & Other Practitioners โ€“ by Provider, 2024.

Medicare-allowed amount

About $172,153 in 2024

The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.

What this does not show: Medicare-allowed amount

This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.

Source: CMS, Medicare Physician & Other Practitioners โ€“ by Provider and Service, 2024.

Paid by Medicare

About $130,758 in 2024

The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.

What this does not show: Paid by Medicare

This is not the clinician's income and not a measure of quality.

Source: CMS, Medicare Physician & Other Practitioners โ€“ by Provider and Service, 2024.

30-day fills

3,747 standardized 30-day fills in 2024

CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.

What this does not show: 30-day fills

It is not a count of patients and not a measure of quality.

Part D drug cost

$446,970 in 2024

The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.

What this does not show: Part D drug cost

A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.

Source: CMS, Medicare Part D Prescribers โ€“ by Provider and Drug, 2024.

Open Payments general payments, program year 2025

All general payments: $24,685.66 across 47 records.

By nature of payment (3 largest of 5)

  • Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program: $18,838.00 across 11 records.
  • Consulting Fee: $4,269.00 across 2 records.
  • Food and Beverage: $1,412.76 across 28 records.

Reporting-company totals (3 largest of 16)

  • Ardelyx, Inc.: $16,460.96 across 17 records.
  • Ascendis Pharma Endocrinology Inc: $3,641.32 across 4 records.
  • OPKO Pharmaceuticals, LLC: $1,920.00 across 1 record.

A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.

See the full table

Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).

Guide: How to read an Open Payments record

Years since graduation

44 years (graduated 1982)

CMS Doctors and Clinicians data list 1982 as the year this clinician finished professional school.

What this does not show: Years since graduation

It is not the number of years in practice, and more years does not mean better care.

Source: CMS Doctors and Clinicians National Downloadable File.

NPI first issued

2006

The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.

What this does not show: NPI first issued

NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.

Source: CMS NPPES NPI Registry.

Accepts Medicare assignment

CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.

Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.

Source: CMS Doctors and Clinicians; Medicare.gov, โ€œDoes your provider accept Medicare as full payment?โ€

Guide: What Medicare assignment means

Telehealth (some services)

Recent Medicare claims show this clinician provided some services by telehealth, such as a video or phone visit.

What this does not show: Telehealth (some services)

It does not mean all services are offered by telehealth, or that telehealth is covered by your plan.

Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.

Guide: How Medicare covers telehealth

Enrolled in Medicare (PECOS)

Dr. Sprague has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.

It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.

Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.

Guide: What Medicare enrollment (PECOS) means

Can order Medicare-covered services

CMS lists Dr. Sprague as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.

What this does not show: Can order Medicare-covered services

It does not mean the clinician offers these services directly.

Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.

Guide: What ordering and referring status means

Compared with the same specialty in Evanston and Illinois

Billing and prescribing volume is not a quality rating.

Medicare Part B services

Close to the middle for clinicians listed under Internal Medicine - Nephrology in Illinois (2024, 421 clinicians with data). Median for this group: 1,458. Middle half: 670 to 2,447.

Too few clinicians listed under Internal Medicine - Nephrology in Evanston have Medicare Part B data for 2024 to compare.

Medicare-allowed amount

Close to the middle for clinicians listed under Internal Medicine - Nephrology in Illinois (2024, 421 clinicians with data). Median for this group: $180,808. Middle half: $72,982 to $273,354.

Too few clinicians listed under Internal Medicine - Nephrology in Evanston have Medicare Part B data for 2024 to compare.

Paid by Medicare

Close to the middle for clinicians listed under Internal Medicine - Nephrology in Illinois (2024, 421 clinicians with data). Median for this group: $139,769. Middle half: $57,744 to $208,126.

Too few clinicians listed under Internal Medicine - Nephrology in Evanston have Medicare Part B data for 2024 to compare.

Medicare Part D prescriptions

More Part D prescriptions than 75% of clinicians listed under Internal Medicine - Nephrology in Illinois (2024, 433 clinicians with data). Median for this group: 642. Middle half: 251 to 1,390.

Too few clinicians listed under Internal Medicine - Nephrology in Evanston have Medicare Part D data for 2024 to compare.

Part D drug cost

A higher Part D drug cost than 90% of clinicians listed under Internal Medicine - Nephrology in Illinois (2024, 433 clinicians with data). Median for this group: $95,131. Middle half: $28,068 to $215,537.

Too few clinicians listed under Internal Medicine - Nephrology in Evanston have Medicare Part D data for 2024 to compare.

9 active clinicians are listed under Internal Medicine - Nephrology with a practice address in Evanston, IL (573 in Illinois).

Addresses are self-reported to NPPES and may be out of date.

Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.

Text: T-MedInfo ยท Report an error.

Pharma & Medical Device Financial Disclosures

Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments

Open Payments ยท Program Year 2025
Disclosure Year:

Program year 2025 (payments made January 1 โ€“ December 31, 2025): 47 records totaling $24,685.66.

Manufacturer Payment Nature Product Type Amount ($)
Ardelyx, Inc.
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program
Cash or cash equivalent
XPHOZAH 30 MG General $2,450.00
Ardelyx, Inc.
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program
Cash or cash equivalent
XPHOZAH 30 MG General $2,450.00
Ardelyx, Inc.
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program
Cash or cash equivalent
XPHOZAH 30 MG General $2,450.00
Ardelyx, Inc.
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program
Cash or cash equivalent
XPHOZAH 30 MG General $2,450.00
Ardelyx, Inc.
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program
Cash or cash equivalent
XPHOZAH 30 MG General $2,450.00
Ascendis Pharma Endocrinology Inc
Consulting Fee
Cash or cash equivalent
โ€” General $2,349.00
OPKO Pharmaceuticals, LLC
Consulting Fee
Cash or cash equivalent
RAYALDEE General $1,920.00
Ardelyx, Inc.
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program
Cash or cash equivalent
XPHOZAH 30 MG General $1,400.00
Ardelyx, Inc.
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program
Cash or cash equivalent
XPHOZAH 30 MG General $1,400.00
Ascendis Pharma Endocrinology Inc
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program
Cash or cash equivalent
Yorvipath General $1,248.00
KYOWA KIRIN, INC.
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program
Cash or cash equivalent
CRYSVITA General $1,150.00
Ardelyx, Inc.
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program
Cash or cash equivalent
XPHOZAH 30 MG General $700.00
KYOWA KIRIN, INC.
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program
Cash or cash equivalent
CRYSVITA General $690.00
Ardelyx, Inc.
Food and Beverage
In-kind items and services
XPHOZAH 30 MG General $142.64
Ardelyx, Inc.
Food and Beverage
In-kind items and services
XPHOZAH 30 MG General $138.92
Ardelyx, Inc.
Food and Beverage
In-kind items and services
XPHOZAH 30 MG General $124.45
AKEBIA THERAPEUTICS INC
Food and Beverage
In-kind items and services
Auryxia General $122.57
Novartis Pharmaceuticals Corporation
Food and Beverage
In-kind items and services
Fabhalta General $120.34
Novo Nordisk Inc
Food and Beverage
In-kind items and services
Rivfloza General $119.71
Ardelyx, Inc.
Food and Beverage
In-kind items and services
XPHOZAH 30 MG General $112.63
Ardelyx, Inc.
Travel and Lodging
Cash or cash equivalent
XPHOZAH 30 MG General $45.20
Ardelyx, Inc.
Travel and Lodging
Cash or cash equivalent
XPHOZAH 30 MG General $40.20
Ardelyx, Inc.
Travel and Lodging
Cash or cash equivalent
XPHOZAH 30 MG General $37.52
Ardelyx, Inc.
Travel and Lodging
Cash or cash equivalent
XPHOZAH 30 MG General $37.42
Bayer Healthcare Pharmaceuticals Inc.
Food and Beverage
In-kind items and services
Kerendia General $34.78

(top 25 shown)

Source: CMS Open Payments, program year 2025, released June 30, 2026.

Performed Procedures & Service Volume

Services billed to Original Medicare Part B in 2024.

CMS Part B ยท Data Year 2024
Reporting Year:

CPTยฎ is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016โ€“2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners โ€“ by Provider and Service data, 2017โ€“2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.

HCPCS Code Services Patients Submitted Charge Medicare Allowed
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more
367 327 $269.68 $152.05
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes
132 70 $160.00 $83.11
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes
93 51 $229.00 $124.98
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
89 89 $155.81 $102.41
G2211 Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's
82 75 $35.00 $17.06
90960 Dialysis services, 4 or more physician visits per month (20 years or older)
79 16 $820.00 $368.60
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more
61 61 $361.00 $193.08
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes
53 52 $428.00 $182.02
99231 Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes
47 38 $93.00 $52.56
90966 Home dialysis services per month (20 years or older)
44 14 $680.00 $305.81
90935 Hemodialysis procedure with physician evaluation
37 21 $275.00 $73.66
90961 Dialysis services, 2-3 physician visits per month (20 years or older)
34 12 $680.00 $307.00
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes
26 26 $293.00 $138.84

Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits

Submitted charges are billed amounts, not a price quote for your visit.

Medicare Part D Prescribing Profile & Medications

Medicare Part D prescriptions filled, including refills, in 2024.

CMS Part D ยท Data Year 2024
Prescription Year:
Brand Name Generic Name Prescriptions Day Supply Total Cost Patients
Indapamide Indapamide 314 27,320 $3,891.59 99
Potassium Citrate Er Potassium Citrate 141 10,793 $18,276.61 42
Chlorthalidone Chlorthalidone 140 12,346 $1,726.53 38
Allopurinol Allopurinol 90 8,100 $1,129.82 34
Potassium Chloride Potassium Chloride 53 4,386 $1,485.38 18
Furosemide Furosemide 50 4,302 $441.93 18
Amlodipine Besylate Amlodipine Besylate 42 3,553 $403.45 12
Alendronate Sodium Alendronate Sodium 40 3,360 $397.88 12
Calcitriol Calcitriol 40 3,448 $649.30 11
Farxiga Dapagliflozin Propanediol 40 1,668 $31,856.71 11
Vitamin D2 Ergocalciferol (Vitamin D2) 38 3,270 $510.95 13
Amiloride Hcl Amiloride Hcl 37 3,330 $707.73 12
Prednisone Prednisone 36 2,434 $325.07 โ€”
Carvedilol Carvedilol 28 2,400 $265.48 โ€”
Losartan Potassium Losartan Potassium 28 2,520 $510.08 โ€”
Sulfamethoxazole-Trimethoprim Sulfamethoxazole/Trimethoprim 27 1,753 $85.13 โ€”
Kerendia Finerenone 25 1,890 $38,840.80 โ€”
Rayaldee Calcifediol 23 1,032 $40,212.20 โ€”
Forteo Teriparatide 22 626 $96,693.11 โ€”
Xphozah Tenapanor Hcl 22 930 $83,398.83 โ€”
Sevelamer Carbonate Sevelamer Carbonate 21 1,110 $2,616.54 โ€”
Torsemide Torsemide 19 904 $207.72 โ€”
Tymlos Abaloparatide 18 540 $46,281.60 โ€”
Teriparatide Teriparatide 18 536 $48,161.38 โ€”
Spironolactone Spironolactone 17 1,520 $144.34 โ€”

(top 25 shown)

Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits

Specialties & License Numbers Reported to NPPES

Self-certified to NPPES: 2021-04-01
Internal Medicine - Nephrology Primary Specialty

NUCC Taxonomy Code: 207RN0300X

License # reported to NPPES IL 036066785

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.

Check License Status with the State Board License numbers are self-reported to NPPES; T-MedInfo does not confirm them against state records. Current status: Illinois Department of Financial and Professional Regulation.
Look Up on State Board Site

Medicare (PECOS) Enrollment & Ordering Eligibility

Source: CMS PECOS
Medicare FFS Enrollment Status Medicare Enrollment on File
CMS Provider Specialty

PRACTITIONER - NEPHROLOGY

Medicare Enrollment ID

I20040824001038

Enrollment State Jurisdiction

IL

PECOS Control ID

0941274054

Medicare Order & Referring Eligibility
Clinical Lab & Imaging (Part B) Eligible
Durable Medical Equipment (DME) Eligible
Home Health Agency (HHA) Eligible
Power Mobility Devices (PMD) Eligible

Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.

Medicare Group Practice Enrollments

Source: CMS Doctors and Clinicians National Downloadable File

Endeavor Health Medical Group

1000 Central St, Evanston, IL 602011780

Endeavor Health Medical Group

2150 Pfingsten Rd, Glenview, IL 600261314

Phone: 6476338504

Endeavor Health Medical Group

2650 Ridge Ave, Evanston, IL 602011700

Endeavor Health Medical Group

2953 Central St, Evanston, IL 602011245

Phone: 8475702512

Endeavor Health Medical Group

2953 Central St, Evanston, IL 602011245

Phone: 8664342597

Endeavor Health Medical Group

2601 Compass Rd, Glenview, IL 600268077

Phone: 8479015263

Secondary Practice Locations

2650 Ridge Ave, Division Of Nephrology Rm 3213

Evanston, IL 602011718

Phone: 8475702512

Clinicians Sharing This Practice Address or Phone

Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.

11 listed
Dr. Jyoti Eknoor Brar , MBBS

Internal Medicine - Nephrology

NPI 1609193028

Bachelor of Medicine, Bachelor of Surgery (M.B.B.S.)

Dr. Ryan Cullen , MD

Internal Medicine - Nephrology

NPI 1538782636

Doctor of Medicine (M.D.)

Dr. Louisa Ho , MD

Internal Medicine - Nephrology

NPI 1932122322

Doctor of Medicine (M.D.)

Nadia Khambati , CDE

Dietitian, Registered

NPI 1730245077

Certified Diabetes Educator

Zareen Khan , APN-CNP

Nurse Practitioner

NPI 1598537680

APNCNP

Dr. George Kim , MD

Internal Medicine - Nephrology

NPI 1548280605

Doctor of Medicine (M.D.)

Career & Practice History Timeline

Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status

8 Historical Events
๐Ÿ“
Updated Practice Location April 01, 2021

Registered at 1000 CENTRAL ST STE 800, EVANSTON, IL 602011780 (Tel: 8475702512)

๐Ÿ“
Updated Business Mailing Address April 01, 2021

Registered at 1000 CENTRAL ST STE 800, EVANSTON, IL 602011780 (Tel: 8475702512)

โœ…
NPI Profile Active July 08, 2007

NPI status registered as active in NPPES database

๐Ÿ“
Practice Location (Initial Record) July 08, 2007

Registered at 2650 RIDGE AVE, DIVISION OF NEPHROLOGY RM 3213, EVANSTON, IL 602011718 (Tel: 8475702512)

๐Ÿ“
Business Mailing Address (Initial Record) July 08, 2007

Registered at 2650 RIDGE AVE, EVANSTON HOSPITAL, EVANSTON, IL 602011718 (Tel: 8475701206)

๐Ÿ‘ค
Provider Name / Credentials (Initial Record) July 08, 2007

Recorded as STUART SPRAGUE, DO

๐ŸŽ“
Medical Taxonomy / Specialty Registered (Primary Specialty) July 08, 2007

Internal Medicine (license number reported to NPPES: IL 036066785)

๐ŸŸข
Initial NPI Registration & Enumeration July 20, 2006

First registered as active Individual Practitioner in NPPES Database.

No reviews have been published yet. Leave a review.

NPI Administrative Meta

NPI Number: 1114947124
Entity Type:
Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)
Enumeration Date: July 20, 2006
Last Update: April 01, 2021
Sole Proprietor: No

Other Internal Medicine - Nephrology Specialists in Evanston

Healthcare providers in Evanston

Mailing Address

1000 Central St Ste 800

Evanston, IL 602011780

Phone: 8475702512

About This Data NPPES fields (address, phone, specialty, license) are self-reported and may be outdated; Medicare fields follow the CMS dataset named in each section. Correct directly at NPPES.