NPPES file of Aug 9, 2026

Mark C. Gunby, DO

Geriatric Medicine (Internal Medicine) Physician · Saint Louis, MO

Mark C. Gunby, DO is a geriatric medicine (internal medicine) physician with a practice address in Saint Louis, Missouri, and NPI 1699886309, issued on Aug 31, 2006. Check the license (Missouri 100326, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1699886309
Name
Mark C. Gunby
Credential
DO
Primary taxonomy
Geriatric Medicine (Internal Medicine) Physician 207RG0300X
License number
100326 MO
Self-reported in NPPES; status is on the state search
Practice location
3844 S Lindbergh Blvd Ste 120, Saint Louis, MO 63127
Phone
(314) 525-0490
Enumerated
Aug 31, 2006
Record last updated
Feb 19, 2021 (not updated in 5 years: call before relying on the address or phone)
Medicaid ID
243773900 MO
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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8 nearest geriatric medicine (internal medicine) physician records → All 75 in Missouri → Look up another NPI →

Also registered at 3844 S Lindbergh Blvd Ste 120

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

  1. Mary Ehlman, MDInternal Medicine Physician1235579012
  2. Hiralben Gandhi, FNPFamily Nurse Practitioner1710423710
  3. Darrin Jalloh, MDInternal Medicine Physician1407588080
  4. Howard Kohn, MDInternal Medicine Physician1053496745
  5. Priyanka Krishnan, MDFamily Medicine Physician1700413150
  6. Moye Mathew, DOInternal Medicine Physician1063932986

Verify Mark C. Gunby in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
    Search for license 100326    Check 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

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3.3 times the Medicare Part D claims of the average geriatric medicine (internal medicine) physician in 2024

14,202 Medicare Part D claims for 1,031 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 458 claims were for opioids.

  1. Mark Gunby14,202
  2. Specialty average4,246

Most prescribed

  1. Atorvastatin Calcium851 claims
  2. Lisinopril694 claims
  3. Amlodipine Besylate542 claims
  4. Levothyroxine Sodium490 claims
  5. Simvastatin374 claims
  6. Eliquis314 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: $61.03

4 payments; by number, the most common kind was food and beverage; the largest payer was Novo Nordisk Inc. The 1,004 providers of this specialty with any payment received $1,720.82 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Mark Gunby$61.03
  2. Specialty average$1,720.82

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

Mark C. Gunby among 75 geriatric medicine (internal medicine) physician records in Missouri

Mark C. Gunby, DO is one of 75 geriatric medicine (internal medicine) physician records with a practice address in Missouri. 72% 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 11% of them.

  • NPI issued2006 · 11% of these records are older, 40% newer
  • In a Medicare fileYes · 72% of these records are
  • In the CMS Doctors and Clinicians fileNo · 45% of these records are
  • Record last updated2021 · 60% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Geriatric Medicine (Internal Medicine) Physician providers in Missouri

There are 75 geriatric medicine (internal medicine) physician records in Missouri.

All 75 in Missouri → Every provider in Saint Louis → Geriatric Medicine (Internal Medicine) Physician nationwide →

The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes

  1. Iqbal Amin, M.D.Saint Louis, MO 631281184619835
  2. Mohammed Mojid, M.D.Saint Louis, MO 631281548255201
  3. Riffat Imdad, M.D.Saint Louis, MO 631251760477426
  4. Poonam Jain, M.D.Saint Louis, MO 631251851446207
  5. Frederick Yap, M.D.Saint Louis, MO 631251780601732
  6. Bruce Lowrie, MDSaint Louis, MO 631221457367278
  7. Richard White, M.D.Saint Louis, MO 631321134417991
  8. Yasmira Watson, MDSaint Louis, MO 631361710091822

Common questions

What is Mark C. Gunby, DO's NPI number?

Mark C. Gunby, DO's National Provider Identifier (NPI) is 1699886309, issued on Aug 31, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Mark C. Gunby, DO located?

The NPPES record lists a practice address at 3844 S Lindbergh Blvd Ste 120, Saint Louis, MO, 63127. Phone: (314) 525-0490. Providers update this record themselves, so call before visiting.

How can I verify Mark C. Gunby, DO's license?

NPPES lists Missouri license number 100326, 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 Mark C. Gunby, DO prescribe under Medicare Part D?

In 2024, Mark C. Gunby, DO had 14,202 Medicare Part D claims for 1,031 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.