Registry data as of Aug 27, 2026

Hari Diwakaran, M.D.

Gastroenterology Physician · Saint Charles, MO

Hari Diwakaran, M.D. is a gastroenterology physician with a practice address in Saint Charles, Missouri, and NPI 1285694703, issued on Mar 27, 2006. Check the license on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.

Record from CMS NPPES, loaded Aug 27, 2026 · Medicare files 2023 and 2024 · method · Verify with CMS →

NPPES recordas of Aug 27, 2026
1285694703
Name
Hari Diwakaran
Credential
M.D.
Primary taxonomy
Gastroenterology Physician 207RG0100X
Practice location
400 1St Capitol Dr Ste 201, Saint Charles, MO 63301
Phone
(636) 669-2332
Enumerated
Mar 27, 2006
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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Also registered at 400 1St Capitol Dr Ste 201

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Igor Brondz, M.D.Obstetrics & Gynecology Physician1750341152
  2. Jennifer Laplante, MD, PHDTrauma Surgery Physician1316262793
  3. Viktoria Meier, AGNPNurse Practitioner1629552138
  4. Samuel Rheinhardt, M.D.Surgery Physician1174903488
  5. Lawrence Tierney, M.D.Gastroenterology Physician1053440222
  6. David Westrich, MDGastroenterology Physician1679927230

Verify Hari Diwakaran in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMissouri Board of Registration for the Healing ArtsCheck the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
Open the Missouri license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

13% more Medicare Part D claims than the average gastroenterology physician in 2024

959 Medicare Part D claims for 521 beneficiaries, against an average of 848 among the 13,066 providers of this specialty who prescribed in Part D.

  1. Hari Diwakaran959
  2. Specialty average848

Most prescribed

  1. Peg 3350-Electrolyte308 claims
  2. Omeprazole197 claims
  3. Pantoprazole Sodium134 claims
  4. Famotidine70 claims
  5. Dicyclomine Hcl26 claims
  6. Cholestyramine24 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: $14.88

1 payment, mostly food and beverage; the largest payer was Fujifilm Healthcare Americas Corporation. The 10,593 providers of this specialty with any payment received $4,948.62 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Hari Diwakaran$14.88
  2. Specialty average$4,948.62

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

One hospital or facility affiliation

  1. Ssm Medical Group IncSaint Charles, MO

Source: CMS Doctors and Clinicians affiliations; Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.

Gastroenterology Physician providers in Missouri

There are 325 gastroenterology physician records in Missouri.

All 325 in Missouri → Every provider in Saint Charles →

Other gastroenterology physician records in Missouri

  1. Kelsey Able, DOKansas City, MO1376806588
  2. Barry Abramson, M.D.Saint Louis, MO1922025980
  3. Tarek Abu-Rajab Tamimi, M.D.Kansas City, MO1689840282
  4. Ayooluwatomiwa Adekunle, MDO Fallon, MO1619593779
  5. Aireen-Ronalda Agulto, MDSaint Louis, MO1447771191
  6. Khulood Ahmed, M.D.Columbia, MO1588827893
  7. Mohamed Ahmed, MDKansas City, MO1194353425
  8. Siddique Akram, MDSaint Louis, MO1457989071
  9. Ghadah Al Ismail, MDSaint Louis, MO1326353855
  10. Alhareth Al Juboori, M.D.Columbia, MO1225370828

Common questions

What is Hari Diwakaran, M.D.'s NPI number?

Hari Diwakaran, M.D.'s National Provider Identifier (NPI) is 1285694703, issued on Mar 27, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Hari Diwakaran, M.D. located?

The NPPES record lists a practice address at 400 1St Capitol Dr Ste 201, Saint Charles, MO, 63301. Phone: (636) 669-2332. Providers update this record themselves, so call before visiting.

How can I verify Hari Diwakaran, M.D.'s license?

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 Hari Diwakaran, M.D. prescribe under Medicare Part D?

In 2024, Hari Diwakaran, M.D. had 959 Medicare Part D claims for 521 beneficiaries; the average among gastroenterology physician prescribers was 848. Part D covers Medicare prescriptions only.

Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.

Compiled from official public sources by the editorial process.

Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.