Dr. Stuart M. Sprague, DO
Nephrology (Kidney) (Nephrology Physician)
1000 Central St Ste 800
Evanston, IL 60201
Who else practices at this address →
Cook County includes primary care (3% of residents) and mental health (4% of residents) shortage areas. About shortage areas
- Medicare participating
At a glance
- Medical school
- Michigan State University College of Osteopathic Medicine (1982)
- Years since graduation
- 44
- In the NPI registry since
- 2006
- Medicare patients seen, 2024
- 655
Licensed in Illinois since 1983, according to the Illinois Department of Financial and Professional Regulation. We show license dates only for the states that publish them in bulk; see which states do. For other states, check the state medical board.
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. NPIs were first issued in May 2005 and became required on claims in 2007–2008, so an early date usually means the clinician was already in practice before then. What an NPI is
Education and training
- 1982Medical school: Michigan State University College of Osteopathic Medicine
- 2006Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier
Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Nephrology Physician primary
IL license 036066785 (first issued 1983; active)
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Northwestern Memorial Hospital Chicago, IL
- Northshore University Healthsystem - Evanston Hospital Evanston, IL
- Swedish Hospital Chicago, IL
Medical groups
- Endeavor Health Medical Group (3,350 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare patients and services
- Medicare patients, 2024
- 655
- Services billed
- 1,480
- Patients’ average age
- 75
| Service | Times | Patients |
|---|---|---|
| Established patient office or other outpatient visit, 40-54 minutes | 399 | 338 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 93 | 50 |
| Established patient office or other outpatient visit, 30-39 minutes | 93 | 92 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 79 | 45 |
| New patient office or other outpatient visit, 60-74 minutes | 75 | 75 |
| Dialysis services, 4 or more physician visits per month (20 years or older) | 68 | 12 |
| Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | 63 | 45 |
| Home dialysis services per month (20 years or older) | 62 | 25 |
| Hemodialysis procedure with physician evaluation | 35 | 23 |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 22 | 22 |
Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.
Medicare prescriptions
| Drug | Prescriptions |
|---|---|
| Indapamide Other prescribers in Evanston, IL | 314 |
| Potassium Citrate Er (potassium citrate) Other prescribers in Evanston, IL | 141 |
| Chlorthalidone Other prescribers in Evanston, IL | 140 |
| Allopurinol Other prescribers in Evanston, IL | 90 |
| Potassium Chloride Other prescribers in Evanston, IL | 53 |
| Furosemide Other prescribers in Evanston, IL | 50 |
| Amlodipine Besylate Other prescribers in Evanston, IL | 42 |
| Calcitriol Other prescribers in Evanston, IL | 40 |
| Alendronate Sodium Other prescribers in Evanston, IL | 40 |
| Farxiga (dapagliflozin propanediol) Other prescribers in Evanston, IL | 40 |
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.
Payments from drug and device companies
In 2025, 16 companies reported 47 payments worth $24,686 in total to this clinician.
| Ardelyx, Inc. | $16,461 |
|---|---|
| Ascendis Pharma Endocrinology Inc | $3,641 |
| Opko Pharmaceuticals, LLC | $1,920 |
| Kyowa Kirin, Inc. | $1,840 |
| Novartis Pharmaceuticals Corporation | $148 |
| Novo Nordisk Inc | $141 |
| Akebia Therapeutics Inc | $123 |
| Otsuka America Pharmaceutical, Inc. | $70.51 |
| Compensation for services other than consulting (speaking, faculty) | $18,838 |
|---|---|
| Consulting Fee | $4,269 |
| Food and Beverage | $1,413 |
| Travel and Lodging | $160 |
| Education | $5.56 |
What the payments were for
| Company | What it was for | Amount |
|---|---|---|
| Ardelyx, Inc. Jan 29, 2025 | Compensation for services other than consulting (speaking, faculty) XPHOZAH 30 MG · NEPHROLOGY | $2,450 |
| Ardelyx, Inc. Mar 12, 2025 | Compensation for services other than consulting (speaking, faculty) XPHOZAH 30 MG · NEPHROLOGY | $2,450 |
| Ardelyx, Inc. Apr 23, 2025 | Compensation for services other than consulting (speaking, faculty) XPHOZAH 30 MG · NEPHROLOGY | $2,450 |
| Ardelyx, Inc. Jul 2, 2025 | Compensation for services other than consulting (speaking, faculty) XPHOZAH 30 MG · NEPHROLOGY | $2,450 |
| Ardelyx, Inc. Oct 22, 2025 | Compensation for services other than consulting (speaking, faculty) XPHOZAH 30 MG · NEPHROLOGY | $2,450 |
| Ascendis Pharma Endocrinology Inc Dec 10, 2025 | Consulting Fee | $2,349 |
| Opko Pharmaceuticals, LLC Nov 13, 2025 | Consulting Fee RAYALDEE · NEPHROLOGY | $1,920 |
| Ardelyx, Inc. Jan 28, 2025 | Compensation for services other than consulting (speaking, faculty) XPHOZAH 30 MG · NEPHROLOGY | $1,400 |
| Ardelyx, Inc. Oct 16, 2025 | Compensation for services other than consulting (speaking, faculty) XPHOZAH 30 MG · NEPHROLOGY | $1,400 |
| Ascendis Pharma Endocrinology Inc May 28, 2025 | Compensation for services other than consulting (speaking, faculty) Yorvipath · Endocrinology | $1,248 |
All 19 payments other than meals, newest first
| Company | What it was for | Amount |
|---|---|---|
| Ascendis Pharma Endocrinology Inc Dec 10, 2025 | Consulting Fee | $2,349 |
| Opko Pharmaceuticals, LLC Nov 13, 2025 | Consulting Fee RAYALDEE · NEPHROLOGY | $1,920 |
| Ardelyx, Inc. Oct 22, 2025 | Compensation for services other than consulting (speaking, faculty) XPHOZAH 30 MG · NEPHROLOGY | $2,450 |
| Ardelyx, Inc. Oct 16, 2025 | Compensation for services other than consulting (speaking, faculty) XPHOZAH 30 MG · NEPHROLOGY | $1,400 |
| Travere Therapeutics, Inc. Aug 19, 2025 | Education Thiola · Kidney Stones · in-kind | $3.01 |
| Travere Therapeutics, Inc. Aug 19, 2025 | Education Thiola · Kidney Stones · in-kind | $2.55 |
| Kyowa Kirin, Inc. Aug 8, 2025 | Compensation for services other than consulting (speaking, faculty) CRYSVITA · FIBROBLAST GROWTH FACTOR 23 FGF23 BLOCKING ANTIBODY | $690 |
| Ardelyx, Inc. Jul 2, 2025 | Compensation for services other than consulting (speaking, faculty) XPHOZAH 30 MG · NEPHROLOGY | $2,450 |
| Ardelyx, Inc. Jul 2, 2025 | Travel and Lodging XPHOZAH 30 MG · NEPHROLOGY · travel to OAKBROOK, IL | $45.20 |
| Ascendis Pharma Endocrinology Inc May 28, 2025 | Compensation for services other than consulting (speaking, faculty) Yorvipath · Endocrinology | $1,248 |
| Ardelyx, Inc. Apr 23, 2025 | Compensation for services other than consulting (speaking, faculty) XPHOZAH 30 MG · NEPHROLOGY | $2,450 |
| Ardelyx, Inc. Apr 23, 2025 | Travel and Lodging XPHOZAH 30 MG · NEPHROLOGY · travel to CHICAGO, IL | $37.42 |
| Kyowa Kirin, Inc. Mar 26, 2025 | Compensation for services other than consulting (speaking, faculty) CRYSVITA · FIBROBLAST GROWTH FACTOR 23 FGF23 BLOCKING ANTIBODY | $1,150 |
| Ardelyx, Inc. Mar 12, 2025 | Compensation for services other than consulting (speaking, faculty) XPHOZAH 30 MG · NEPHROLOGY | $2,450 |
| Ardelyx, Inc. Mar 12, 2025 | Travel and Lodging XPHOZAH 30 MG · NEPHROLOGY · travel to LOMBARD, IL | $37.52 |
| Ardelyx, Inc. Jan 29, 2025 | Compensation for services other than consulting (speaking, faculty) XPHOZAH 30 MG · NEPHROLOGY | $2,450 |
| Ardelyx, Inc. Jan 29, 2025 | Travel and Lodging XPHOZAH 30 MG · NEPHROLOGY · travel to LINCOLNSHIRE, IL | $40.20 |
| Ardelyx, Inc. Jan 28, 2025 | Compensation for services other than consulting (speaking, faculty) XPHOZAH 30 MG · NEPHROLOGY | $1,400 |
| Ardelyx, Inc. Jan 15, 2025 | Compensation for services other than consulting (speaking, faculty) XPHOZAH 30 MG · NEPHROLOGY | $700 |
Each payment as the company reported it, with the products it named. Meals are counted in the totals above but not listed one by one.
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.
Industry-funded research
Named as a principal investigator on 4 industry-funded studies in 2025, from 4 companies. The companies reported $39,239 in research payments for these studies, mostly to the institutions running them.
- Eneboparatide - Calypso study which is a pivotal phase 3 study investigational therapeutic peptide with a novel mechanism of action for hypoparathyroidism
Alexion Pharmaceuticals, Inc. - A Phase 3, Randomized, Double-blind, Placebo-controlled Study of BION-1301 in Adults With IgA Nephropathy (The BEYOND Study)
Novartis Pharmaceuticals Corporation - A Study to Examine the Efficacy and Safety of Zanubrutinib Given to Adults With Primary Membranous Nephropathy
Beigene, Ltd. · Active, not recruiting · NCT05707377 - A Registry for Participants With Chronic Hypoparathyroidism
Takeda Pharmaceuticals U.S.A., Inc. · Completed · NCT01922440
From CMS Open Payments research payments, where companies name up to five principal investigators per payment. Research payments usually go to hospitals, universities and research sites, not to the investigator personally. A payment is not evidence of wrongdoing.