Curr Opin Endocrinol Diabetes Obes
Bone DensityBone Density Conservation AgentsChronic Kidney Disease-Mineral and Bone Disorder
Dr. Nicholas S. Kowalczyk, MD
NPI1598385627
- Part D claims, 2024
- 176
- Publications
- 7
- Industry payments
- $582
- State license
- 1
- Year NPI issued
- 2020
- Practice address
- 5721 S Maryland Ave, Chicago, IL 60637
- Practice phone
- Call (773) 702-1530
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
The University of Chicago Medical Center
Chicago, Illinois
Find Dr. Kowalczyk's professional email, personal email and mobile number
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Dr. Nicholas S. Kowalczyk is a nephrologist in Chicago, Illinois
Dr. Kowalczyk practices at The University of Chicago Medical Center in Chicago, Illinois.
Dr. Kowalczyk's NPI, 1598385627, was assigned on April 18, 2020. Dr. Kowalczyk holds Illinois license 036.163402.
NPI and contact details
- NPI
- 1598385627NPI Registry (opens in a new tab)
- NPI enumeration date
- April 18, 2020
- NPI status
- Active
- Practice phone
- (773) 702-1530
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. Nicholas S. Kowalczyk practices at The University of Chicago Medical Center in Chicago, Illinois
Dr. Kowalczyk's primary practice is The University of Chicago Medical Center, at 5721 S Maryland Ave, Chicago, IL 60637 in Cook County. The practice phone is (773) 702-1530.
- The University of Chicago Medical Center5721 S Maryland Ave, Chicago, IL 60637 · Cook CountyPhone(773) 702-1530
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Nicholas S. Kowalczyk is affiliated with 1 site of care
Dr. Kowalczyk's primary practice is The University of Chicago Medical Center in Chicago, Illinois.
The University of Chicago Medical CenterPrimary
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dmand AI tracks the EHR system at Dr. Nicholas S. Kowalczyk's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Kowalczyk practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| The University of Chicago Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Nicholas S. Kowalczyk is one of 534 nephrologists in Illinois
Nephrology is Dr. Kowalczyk's primary specialty in the NPI Registry, under taxonomy code 207RN0300X. Dr. Kowalczyk is licensed in Illinois.
Specialties and state licenses
- Nephrology, IllinoisPrimary
Nephrologists near Dr. Kowalczyk
Counts of nephrologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Nicholas S. Kowalczyk's patients have a median age of 65
Across all payers, Dmand AI patient panel data puts Dr. Kowalczyk's median patient age at 65, with 80% women.
Dr. Kowalczyk's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
Patient panel by sex, all payers
- Women80%
- Men20%
Source: Dmand AI Patient Panel Data
Dr. Nicholas S. Kowalczyk wrote 176 Medicare Part D claims in 2024
In 2024, Dr. Kowalczyk wrote 176 Medicare Part D claims for 53 patients. 68% of them were for generic drugs. CMS names the drug for 75 of them, across 3 drugs with 11 or more claims each, at $49,814 in total drug cost. In 2023, CMS named 388 claims across 16 drugs.
Part D claims, 2024176
Drugs named by CMS3
Total drug cost$49,814
Part D patients53
Dr. Kowalczyk's Part D claims by kind of drug, 2024
- Generic119 claims68%
- Brand-name and other57 claims32%
Dr. Kowalczyk's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 3882024: 7581%
Drugs named by CMS: 3 in 2024, 16 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
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Dr. Nicholas S. Kowalczyk has 7 publications on record
Dmand AI links 7 papers to Dr. Kowalczyk, published from 2017 to 2025. 2025 was the busiest year, with 3. The most frequent topics are Kidney Calculi and Renal Insufficiency, Chronic. Dr. Kowalczyk's most frequent co-authors are Megan L. Prochaska and Stuart M. Sprague, DO.
Papers7
Years published2017 to 2025
Dr. Kowalczyk's papers by year, 2017 to 2025
Topics Dr. Kowalczyk writes about most
- Kidney Calculi
- Renal Insufficiency, Chronic
Dr. Kowalczyk's most frequent co-authors
Recent publications by Dr. Kowalczyk
Curr Opin Cardiol
Diabetes Mellitus, Type 2Glucagon-Like Peptide-1 Receptor AgonistsHeart Failure
Curr Opin Nephrol Hypertens
CalciumCalcium OxalateKidney Calculi
CystinuriaKidney Calculi
See who Dr. Kowalczyk researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Kowalczyk works with, so you can find a warm path to the right nephrologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Nicholas S. Kowalczyk received $582 in industry payments from 2023 to 2025
CMS Open Payments shows 8 general payments to Dr. Kowalczyk from 7 drug and device companies from 2023 to 2025. Food and beverage make up the largest share, 86% of the total. Novartis Pharmaceuticals Corporation paid the most, $232.
General payments to Dr. Kowalczyk by program year, 2023 to 2025
General payments to Dr. Kowalczyk by kind, 2023 to 2025
$582in total
- Food and beverage$50286%
- Education$8014%
Companies that paid Dr. Kowalczyk the most, 2023 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Nicholas S. Kowalczyk's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Nicholas S. Kowalczyk
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Nicholas S. Kowalczyk's NPI number?
Dr. Nicholas S. Kowalczyk's NPI number is 1598385627. It was assigned on April 18, 2020, and it is active in the NPI Registry.
What kind of doctor is Dr. Nicholas S. Kowalczyk?
Dr. Nicholas S. Kowalczyk is a nephrologist in Chicago, Illinois. The primary specialty in the NPI Registry is Nephrology Physician (taxonomy code 207RN0300X).
Where does Dr. Nicholas S. Kowalczyk practice?
Dr. Kowalczyk practices at 5721 S Maryland Ave, Chicago, IL 60637. Dr. Kowalczyk's primary practice is The University of Chicago Medical Center in Chicago, Illinois.
What is Dr. Nicholas S. Kowalczyk's office phone number?
The practice phone on file for Dr. Kowalczyk is (773) 702-1530.
What is Dr. Nicholas S. Kowalczyk's medical license number?
Dr. Kowalczyk holds Illinois license 036.163402.
What drugs does Dr. Nicholas S. Kowalczyk prescribe most?
In 2024 Medicare Part D data, Dr. Kowalczyk's most prescribed drugs by claims were Jardiance, Olmesartan Medoxomil and Chlorthalidone.
Has Dr. Nicholas S. Kowalczyk received payments from drug or device companies?
CMS Open Payments shows $582 in general payments to Dr. Kowalczyk from 7 companies from 2023 to 2025. The largest total came from Novartis Pharmaceuticals Corporation.
How long has Dr. Nicholas S. Kowalczyk been practicing?
Dr. Kowalczyk's NPI was assigned in 2020.
Does Dr. Nicholas S. Kowalczyk do research?
Dmand AI links 7 publications to Dr. Kowalczyk, published from 2017 to 2025.
Who does Dr. Nicholas S. Kowalczyk publish with?
Dr. Kowalczyk's most frequent co-authors are Megan L. Prochaska (2 shared papers) and Stuart M. Sprague, DO (2 shared papers).
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