Darren A. Kastin, M.D.
Gastroenterology Physician · Naperville, IL
Darren A. Kastin, M.D. is a gastroenterology physician with a practice address in Naperville, Illinois, and NPI 1164402244, issued on Jan 17, 2006. Check the license (Illinois 036-102510, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Darren A. Kastin
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 036-102510 IL
Self-reported in NPPES; status is on the state search - Practice location
- 1243 Rickert Dr, Naperville, IL 60540
- Phone
- (630) 527-6450
- Enumerated
- Jan 17, 2006
- Record last updated
- Jul 28, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (630) 527-6456
- Medicaid ID
- 036-102510 IL
- Medicare enrollment
- Enrolled (PECOS I20040416000112); accepts Medicare assignment
- Medical or professional school
- Tulane University School Of Medicine, 1997
- Entity
- Type 1 · individual
Also registered at 1243 Rickert Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Scott Berger, M.D.Gastroenterology Physician1366483455
- Abhishek Bhandari, M.D.Gastroenterology Physician1194092031
- Sidharth Bhandari, D.O.Gastroenterology Physician1871941435
- Michelle Bianzon, AGPCNPNurse Practitioner1144623752
- Thomas Couri, M.D.Gastroenterology Physician1619357639
- Hemali DesaiPhysician Assistant1710467766
Verify Darren A. Kastin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036-102510Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
23% fewer Medicare Part D claims than the average gastroenterology physician in 2024
624 Medicare Part D claims for 361 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 28% of claims.
Most prescribed
- Peg 3350-Electrolyte200 claims
- Omeprazole99 claims
- Pantoprazole Sodium63 claims
- Gavilyte-G37 claims
- Sod Sulf-Potass Sulf-Mag Sulf23 claims
- Dicyclomine Hcl22 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 91.4 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Suburban Gastroenterology LtdNaperville, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gastroenterology Physician providers in Illinois
There are 887 gastroenterology physician records in Illinois.
Other gastroenterology physician records in Illinois
- Abdul Aadam, M.D.Chicago, IL1013038744
- Richard Aaronson, M.D.Olympia Fields, IL1578520656
- Abdelhai Abdelqader, MDMaywood, IL1073931127
- Mustafa Abdul-Hussein, MDMattoon, IL1972759173
- Abdullah AbdussalamDes Plaines, IL1932442613
- Ayokunle Abegunde, M.D.Maywood, IL1194031435
- Majd Aboona, MDChicago, IL1386347789
- James Abraham, MDNaperville, IL1427276732
- Rana Abraham, M.D., M.S.Chicago, IL1437318516
- Frida Abrahamian, MDChicago, IL1447274279
Common questions
What is Darren A. Kastin, M.D.'s NPI number?
Darren A. Kastin, M.D.'s National Provider Identifier (NPI) is 1164402244, issued on Jan 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Darren A. Kastin, M.D. located?
The NPPES record lists a practice address at 1243 Rickert Dr, Naperville, IL, 60540. Phone: (630) 527-6450. Providers update this record themselves, so call before visiting.
How can I verify Darren A. Kastin, M.D.'s license?
NPPES lists Illinois license number 036-102510, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Darren A. Kastin, M.D. prescribe under Medicare Part D?
In 2024, Darren A. Kastin, M.D. had 624 Medicare Part D claims for 361 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is Darren A. Kastin, M.D.'s MIPS final score?
The 2023 MIPS final score is 91.4 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.