Aaron B. Greenspan, MD
Gastroenterology Physician · Saint Louis, MO
Aaron B. Greenspan, MD is a gastroenterology physician with a practice address in Saint Louis, Missouri, and NPI 1558382911, issued on Jul 21, 2006. Check the license (Missouri 104978, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Aaron B. Greenspan
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 104978 MO
Self-reported in NPPES; status is on the state search - Practice location
- 1 Barnes Jewish Hospital Plz, Saint Louis, MO 63110
- Phone
- (314) 747-2066
- Enumerated
- Jul 21, 2006
- Record last updated
- Apr 17, 2025
- Fax
- (314) 362-2357
- Medicaid ID
- 209140003 MO
- Medicare enrollment
- Enrolled (PECOS I20040331001227); accepts Medicare assignment
- Medical or professional school
- University Of Pittsburgh School Of Medicine, 1991
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 414 in Missouri → Look up another NPI →
Also registered at 1 Barnes Jewish Hospital Plz
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Aaron B. Greenspan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license 104978Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
51% more Medicare Part D claims than the average gastroenterology physician in 2024
1,223 Medicare Part D claims for 365 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 19% of claims.
Most prescribed
- Omeprazole244 claims
- Pantoprazole Sodium155 claims
- Famotidine101 claims
- Gavilyte-G80 claims
- Linzess69 claims
- Amitriptyline Hcl58 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $643.38
14 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Biotech, Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Pana Community Hospital AssociationPana, IL
- Washington UniversitySaint Louis, MO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Aaron B. Greenspan among 414 gastroenterology physician records in Missouri
Aaron B. Greenspan, MD is one of 414 gastroenterology physician records with a practice address in Missouri. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 14% of them.
- NPI issued2006 · 14% of these records are older, 47% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 73% of these records are
- Graduated1991 · median 2003 among the 303 with a school on file
- Record last updated2025 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Missouri
There are 414 gastroenterology physician records in Missouri.
All 414 in Missouri → Every provider in Saint Louis → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Riad Azar, MDSaint Louis, MO 631101952358970
- Chien-Huan Chen, MDSaint Louis, MO 631101588691265
- Jeffrey Crippin, MDSaint Louis, MO 631101265458574
- Nicholas Davidson, MDSaint Louis, MO 631101659397958
- Brian Dieckgraefe, MDSaint Louis, MO 631101295751428
- Jaquelyn Fleckenstein, MDSaint Louis, MO 631101386600864
- Chandra Gyawali, MDSaint Louis, MO 631101821014127
- Tariq Hassan, MDSaint Louis, MO 631101710970587
Common questions
What is Aaron B. Greenspan, MD's NPI number?
Aaron B. Greenspan, MD's National Provider Identifier (NPI) is 1558382911, issued on Jul 21, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Aaron B. Greenspan, MD located?
The NPPES record lists a practice address at 1 Barnes Jewish Hospital Plz, Saint Louis, MO, 63110. Phone: (314) 747-2066. Providers update this record themselves, so call before visiting.
How can I verify Aaron B. Greenspan, MD's license?
NPPES lists Missouri license number 104978, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Aaron B. Greenspan, MD prescribe under Medicare Part D?
In 2024, Aaron B. Greenspan, MD had 1,223 Medicare Part D claims for 365 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.