John S. Farrell, M.D.
Gastroenterology Physician · Saint Louis, MO
John S. Farrell, M.D. is a gastroenterology physician with a practice address in Saint Louis, Missouri, and NPI 1194724724, issued on Jul 15, 2005. Check the license (Missouri R5636, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- John S. Farrell
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- R5636 MO
Self-reported in NPPES; status is on the state search - Practice location
- 621 S New Ballas RD, Saint Louis, MO 63141
- Phone
- (314) 251-6966
- Enumerated
- Jul 15, 2005
- Record last updated
- Nov 4, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (314) 251-6632
- Medicaid ID
- 200162204 MO
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 414 in Missouri → Look up another NPI →
Also registered at 621 S New Ballas RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John S. Farrell 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 R5636Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average gastroenterology physician in 2024
27 Medicare Part D claims, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D.
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.
John S. Farrell among 414 gastroenterology physician records in Missouri
John S. Farrell, M.D. 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 86% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileNo · 73% of these records are
- Record last updated2008 · 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
- Marc Bernstein, M.D.Saint Louis, MO 631411336110543
- Mohammad Tarik Firozi, MDSaint Louis, MO 631411962481648
- David Goran, MDSaint Louis, MO 631411578672648
- Elizabeth Huebner, MDCreve Coeur, MO 631411760592794
- Paul King, M.D.Saint Louis, MO 631411609872704
- Muddasani Reddy, DOSaint Louis, MO 631411013930585
- Rajesh Shah, M.D.Saint Louis, MO 631411912066382
- Aman Singh, MDSaint Louis, MO 631411548237845
Common questions
What is John S. Farrell, M.D.'s NPI number?
John S. Farrell, M.D.'s National Provider Identifier (NPI) is 1194724724, issued on Jul 15, 2005. An NPI identifies a provider in billing; it is not a license.
Where is John S. Farrell, M.D. located?
The NPPES record lists a practice address at 621 S New Ballas RD, Saint Louis, MO, 63141. Phone: (314) 251-6966. Providers update this record themselves, so call before visiting.
How can I verify John S. Farrell, M.D.'s license?
NPPES lists Missouri license number R5636, 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 John S. Farrell, M.D. prescribe under Medicare Part D?
In 2024, John S. Farrell, M.D. had 27 Medicare Part D claims; 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.