DR. ROBERT M. SIWIEC (M.D.) – Gastroenterology Physician, NPI 1184880676
Gastroenterology Physician
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Profile Insights
NPPES metrics only — not quality of care.
448 GASTROENTEROLOGY in IN
Provider Addresses for DR. ROBERT M. SIWIEC (M.D.)
1701 N Senate Blvd
Indianapolis, IN 462021239
Phone: (888) 484-3258
Type: Location
West 10th Street, Indianapolis, Marion, Indiana, 46202-5816, United States
INDIANAPOLIS, IN 462022859
Phone: (317) 944-5000
Type: Location
North Shadeland Avenue, Castleton, Vertland, Indianapolis, Indiana, 46250, United States
STE 130 PROVIDER ENROLLMENT
INDIANAPOLIS, IN 462194959
Phone:
Type: Mailing
11725 ILLINOIS ST STE 275
CARMEL, IN 460323009
Phone: (317) 944-0980
Fax: (317) 968-1348
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
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Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2012-06-13
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20120613000472 | I | Gastroenterology | IN | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 57 | 51 | $0 |
| 45385 | Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 47 | 47 | $0 |
| G0105 | Colorectal cancer screening; colonoscopy on individual at high risk | 34 | 34 | $0 |
| 43235 | Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 32 | 30 | $0 |
| 99222 | Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 29 | 29 | $0 |
Insurance plans in this area (ZIP 46202)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| GASTROENTEROLOGY | IN | 43235 | Diagnostic examination of esophagus, stomach, and/or upper small bowel using an endoscope | 41 | 39 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Pediatric Medicine | NC | |
| U R O L O G Y | IN | |
| Diagnostic Radiology, Interventional Radiology | NY | |
| Nurse Practitioner | IN | |
| P A T H O L O G Y | IN | |
| O T O L A R Y N G O L O G Y | IN | |
| E N D O C R I N O L O G Y | IN | |
| Family Practice, Sports Medicine | IN | |
| Gastroenterology, Internal Medicine | IN | |
| Orthopedic Surgery | MO |
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