Physician Profile
Aaron B. Greenspan, MD
Unclaimed ProfileAbout Dr. Greenspan
Aaron B. Greenspan, MD practices gastroenterology in Saint Louis, MO. Aaron is a 1991 graduate of University of Pittsburgh School of Medicine. Medicare claims data shows Aaron provided 254 services to 241 patients. The services billed most often include established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more, diagnostic exam of large bowel using a flexible endoscope, and biopsy of large bowel using a flexible endoscope.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it — free, and no identity document with a practice or institutional email.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (314) 747-2066
- Email not available
Practice Locations
1 BARNES JEWISH HOSPITAL PLZ DIV IM GASTROENTEROLOGY
Saint Louis, MO 63110
Conditions Commonly Evaluated or Treated
Within Gastroenterology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
- Acid reflux
- Celiac disease
- Crohn's disease
- Hemorrhoids
- IBS
- Swallowing difficulties
- Ulcerative colitis
Biliary and pancreas
Colon and anorectal
Esophagus and swallowing
Functional bowel and motility
Liver
- Ascites
- Autoimmune hepatitis
- Cirrhosis
- Fatty liver disease
- Hemochromatosis
- Hepatitis B
- Hepatitis C
- Portal hypertension
Stomach and duodenum
Bowel & Colon
Digestive Symptoms
Gallbladder & Bile Ducts
Procedures & services
Most searched procedures
Lower endoscopy
Upper endoscopy
Capsule and physiology testing
Diagnostic Testing
Liver procedures
Treatments
Procedures Most Often Billed to Medicare
254 services · 241 patients · 10 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Diagnostic exam of large bowel using a flexible endoscope | Procedure | 45378 |
41 | More often than most peers in Gastroenterology |
| Biopsy of large bowel using a flexible endoscope | Procedure | 45380 |
37 | As often as other peers in Gastroenterology |
| Removal of polyps or growths of large bowel using an endoscope with mechanical snare | Procedure | 45385 |
30 | Less often than most peers in Gastroenterology |
| Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43239 |
22 | Less often than most peers in Gastroenterology |
| Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43235 |
21 | As often as other peers in Gastroenterology |
| Dilation of esophagus | Procedure | 43450 |
12 | Less often than most peers in Gastroenterology |
| Balloon dilation of esophagus, stomach, and/or upper small bowel using a flexible endoscope, less than 3.0 cm | Procedure | 43249 |
12 | Less often than most peers in Gastroenterology |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
41 | As often as other peers in Gastroenterology |
| Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | Office visit | 99231 |
26 | As often as other peers in Gastroenterology |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | Office visit | 99222 |
12 | Less often than most peers in Gastroenterology |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Related specialists at this location 8
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other gastroenterologists in Saint Louis 8
Same specialty, same city.
More connections — 24 related providers in 3 groups
Trained at University of Pittsburgh School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 1991 at University of Pittsburgh School of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Diagnostic exam of large bowel using a flexible endoscope 8
Providers in MO who bill this service to Medicare most often.
Common questions
What does Dr. Greenspan specialize in?
Dr. Greenspan is a gastroenterologist in Saint Louis, MO. That is the designation recorded for this NPI in the federal registry, where it is listed as “Gastroenterology”.
NPI registry
Where is Dr. Greenspan located?
Dr. Greenspan is listed at 1 Barnes Jewish Hospital Plz Div Im Gastroenterology, Saint Louis, MO 63110. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Greenspan's phone number?
The number on file is (314) 747-2066. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Dr. Greenspan?
Dr. Greenspan's National Provider Identifier is 1558382911. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Greenspan go to medical school?
Dr. Greenspan attended University of Pittsburgh School of Medicine, graduating in 1991. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Greenspan have?
Dr. Greenspan has 35 years experience. Calculated from a graduation year of 1991, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Greenspan do most often?
According to Medicare billing data, Dr. Greenspan performs procedures including diagnostic exam of large bowel using a flexible endoscope, biopsy of large bowel using a flexible endoscope and removal of polyps or growths of large bowel using an endoscope with mechanical snare, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Greenspan's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Greenspan. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.