Darren Kastin, M.D.
NPI 1164402244 · Gastroenterology Physician · Naperville, IL
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Darren Kastin, M.D. is a Gastroenterology Physician provider in Naperville, IL (NPI 1164402244).
Provider details
- NPI number
- 1164402244
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 036-102510 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
522 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 145 | $250 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 78 | $95 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 57 | $133 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 50 | $173 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 47 | $83 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Sodium Chloride/Nahco3/Kcl/Pegbrand: Peg 3350-Electrolyte | 200 | 197 |
| Omeprazole | 99 | 41 |
| Pantoprazole Sodium | 63 | 26 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 37 | 37 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 23 | 23 |
| Dicyclomine Hcl | 22 | — |
| Lansoprazole |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-01-17
- Last updated
- 2008-07-28
Frequently asked questions
- What is Darren Kastin's NPI number?
- Darren Kastin's National Provider Identifier (NPI) is 1164402244, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Darren Kastin's specialty?
- Darren Kastin is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Darren Kastin located?
- Darren Kastin's practice location on file with NPPES is 1243 Rickert Dr, Naperville, IL 60540-0954.
- What is Darren Kastin's phone number?
- The practice phone number listed in the NPPES registry for Darren Kastin is (630) 527-6450.
- Does Darren Kastin accept Medicare?
- Darren Kastin is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Darren Kastin's NPI active?
- Yes — Darren Kastin's NPI (1164402244) is active in the NPPES registry as of the last update on 2008-07-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.