Doctor profile · Federal record
Dr. Aaron Greenspan, MD
Gastroenterology Physician (CMS: Gastroenterology) · Saint Louis, MO
- NPI 1558382911
- Accepts Medicare
- 35 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
1 Barnes Jewish Hospital Plz, Div Im Gastroenterology
Saint Louis, MO 631101003
(314) 747-2066
fax (314) 362-2357 - Mailing address
-
Po Box 7412011
Chicago, IL 606742011
Credentials & registration
- NPI registered
- July 2006 — 20 yrs on file
- Profile last updated
- April 17, 2025
- Year of graduation
- 1991 — 35 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- Missouri #104978
- Medicaid
- MO #209140003
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1558382911. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
517
Distinct HCPCS
10
Medicare allowed
$60,758
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 115 | 86 | $89 | |
45378 |
Diagnostic exam of large bowel using a flexible endoscope | 66 | 66 | $183 | |
43235 |
Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 47 | 46 | $95 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 44 | 44 | $173 | |
99231 |
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | 38 | 27 | $51 | |
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 36 | 25 | $79 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 31 | 31 | $256 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 31 | 30 | $120 | |
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 28 | 27 | $131 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 19 | 19 | $91 |
In context: peer comparison
Among 42 peers in Saint Louis Gastroenterology Physician, average services per provider: 60. This provider delivers 8.6× the peer median.Open Payments
Industry payments received
All-time total
$643
Transactions
14
Manufacturers
5
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Janssen Biotech, INC. | 9 | $544.52 | |
| Abbvie INC. | 2 | $38.45 | |
| Lilly USA, LLC | 1 | $23.13 | |
| Celgene Corporation | 1 | $20.93 | |
| Ironwood Pharmaceuticals, INC | 1 | $16.35 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
1,343
Patients
316
Total drug cost
$157,085
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Omeprazole | Generic | 389 | 111 | $6,814 |
| Pantoprazole Sodium | Generic | 224 | 66 | $4,173 |
| Linzess (Linaclotide) | Brand | 118 | 26 | $76,752 |
| Famotidine | Generic | 111 | 28 | $2,130 |
| Amitriptyline Hcl | Generic | 96 | 25 | $2,028 |
| Dicyclomine Hcl | Generic | 76 | 24 | $2,500 |
| Metoclopramide Hcl | Generic | 64 | 20 | $1,003 |
| Cholestyramine (Cholestyramine (With Sugar)) | Brand | 49 | 0 | $5,628 |
| Azathioprine | Generic | 43 | 0 | $2,247 |
| Sucralfate | Generic | 42 | 16 | $1,969 |
Hospital affiliations
Frequently asked questions
What is Dr. Aaron Greenspan's medical specialty?
Dr. Aaron Greenspan practices Gastroenterology Physician in Saint Louis, MO.
Where does Dr. Aaron Greenspan practice?
Dr. Aaron Greenspan practices at 1 Barnes Jewish Hospital Plz, Saint Louis, MO 631101003. Office phone: 3147472066.
What is Dr. Aaron Greenspan's NPI?
Dr. Aaron Greenspan's National Provider Identifier (NPI) is 1558382911, issued by NPPES.
Does Dr. Aaron Greenspan accept Medicare assignment?
Yes. Dr. Aaron Greenspan accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Aaron Greenspan commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99213); Diagnostic exam of large bowel using a flexible endoscope (HCPCS 45378); Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope (HCPCS 43235). Source: CMS Medicare Physician & Other Practitioners file.