DR. AARON B GREENSPAN (MD) – Gastroenterology Physician, NPI 1558382911
Gastroenterology Physician
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Profile Insights
NPPES metrics only — not quality of care.
4,186 INTERNAL MEDICINE in MO
Provider Addresses for DR. AARON B GREENSPAN (MD)
101, West Lincoln Street, Belleville, Saint Clair County, Illinois, 62220, United States
BELLEVILLE, IL 622201902
Phone: (618) 222-3200
Fax: (618) 222-3203
Type: Mailing
PO BOX 7412011
CHICAGO, IL 606742011
Phone: (314) 747-2066
Fax: (314) 362-2357
Type: Mailing
1 BARNES JEWISH HOSPITAL PLZ
DIV IM GASTROENTEROLOGY
SAINT LOUIS, MO 631101003
Phone: (314) 747-2066
Fax: (314) 362-2357
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 67 Open Payments records for all available years, with a total value of $1,478.
Total Amount is formed as General ($1,478) + Research ($0) + Ownership ($0) = $1,478.
Last reported payment date: 2024-11-19 • Largest payer in this snapshot: Janssen Biotech, Inc. ($767).
Total Amount
$1,478
General + Research + Ownership
Payments
67
Total payment records
General Amount
$1,478
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-11-19
Latest reported date
Top Companies
Largest payers in this snapshot
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: 2009-01-08
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 2 Medicare enrollment records; no due dates published yet.
Enrollment records
2
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 |
|---|---|---|---|---|
| I20040331001227 | I | Gastroenterology | MO | TBD |
| I20090108000568 | I | Gastroenterology | IL | 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 |
|---|---|---|---|---|
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 115 | 86 | $0 |
| 45378 | Diagnostic exam of large bowel using a flexible endoscope | 66 | 66 | $0 |
| 43235 | Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 47 | 46 | $0 |
| 45380 | Biopsy of large bowel using a flexible endoscope | 44 | 44 | $0 |
| 99231 | Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | 38 | 27 | $0 |
Insurance plans in this area (ZIP 62220)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| GASTROENTEROLOGY | IL | 43235 | Diagnostic examination of esophagus, stomach, and/or upper small bowel using an endoscope | 36 | 35 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Nurse Practitioner | IL | |
| Nurse Practitioner | IL | |
| Nurse Practitioner | IL | |
| Clinical Social Worker | IL | |
| - | IL | |
| Interventional Cardiology | MO | |
| General Surgery | IL | |
| Family Practice | IL | |
| - | IL | |
| Family Practice | MO |
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