Robert Siwiec, M.D.
NPI 1184880676 · Gastroenterology Physician · Carmel, IN
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Robert Siwiec, M.D. is a Gastroenterology Physician provider in Carmel, IN (NPI 1184880676).
Provider details
- NPI number
- 1184880676
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 036122288 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
17 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
367 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) |
|---|---|---|
| Diagnostic Exam of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43235 | 55 | $101 |
| Colorectal Cancer Screening; Colonoscopy on Individual at High RiskG0105 | 54 | $166 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 46 | $229 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 40 | $119 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 34 | $90 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 24 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 95 | 31 |
| Ondansetronbrand: Ondansetron Odt | 55 | 19 |
| Famotidine | 48 | 11 |
| Linaclotidebrand: Linzess | 48 | 11 |
| Dicyclomine Hcl | 40 | 20 |
| Pantoprazole Sodium | 38 | 15 |
| Dexlansoprazolebrand: Dexlansoprazole Dr | 27 | — |
Practice location
Mailing address
Additional practice locations (1)
- 1701 N Senate BlvdIndianapolis, IN 46202-1239Phone: (888) 484-3258
Registry dates
- Enumerated
- 2008-08-04
- Last updated
- 2025-03-11
- Certified
- 2025-03-11
Frequently asked questions
- What is Robert Siwiec's NPI number?
- Robert Siwiec's National Provider Identifier (NPI) is 1184880676, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Robert Siwiec's specialty?
- Robert Siwiec is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Robert Siwiec located?
- Robert Siwiec's practice location on file with NPPES is 11725 Illinois St Ste 275, Carmel, IN 46032-3009.
- What is Robert Siwiec's phone number?
- The practice phone number listed in the NPPES registry for Robert Siwiec is (317) 944-0980.
- Does Robert Siwiec accept Medicare?
- Robert Siwiec is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Robert Siwiec's NPI active?
- Yes — Robert Siwiec's NPI (1184880676) is active in the NPPES registry as of the last update on 2025-03-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.