NPPES file of Aug 9, 2026

Marc O. Merbaum, M.D.

Internal Medicine Physician · Saint Louis, MO

Marc O. Merbaum, M.D. is an internal medicine physician with a practice address in Saint Louis, Missouri, and NPI 1245204338, issued on Feb 15, 2006. Check the license (Missouri 116179, 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
1245204338
Name
Marc O. Merbaum
Credential
M.D.
Primary taxonomy
Internal Medicine Physician 207R00000X
License number
116179 MO
Self-reported in NPPES; status is on the state search
Practice location
5034 Griffin RD, Saint Louis, MO 63128
Phone
(314) 843-7333
Enumerated
Feb 15, 2006
Record last updated
Feb 13, 2017 (not updated in 9 years: call before relying on the address or phone)
Fax
(314) 843-9946
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 internal medicine physician records → All 2,604 in Missouri → Look up another NPI →

Also registered at 5034 Griffin RD

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

  1. Curt Calcaterra, M.D.Internal Medicine Physician1205827557
  2. Kathleen Cizek, M.D.Internal Medicine Physician1083605331
  3. Marissa Digregorio, DNP, AGNPAdult Health Nurse Practitioner1700561321
  4. James Ebel, M.D.Internal Medicine Physician1174504146
  5. Christopher Espana, M.D.Family Medicine Physician1003922634
  6. Robert Geekie, M.D.Internal Medicine Physician1528059730

Verify Marc O. Merbaum 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 116179    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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4.1 times the Medicare Part D claims of the average internal medicine physician in 2024

13,141 Medicare Part D claims for 805 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 323 claims were for opioids.

  1. Marc Merbaum13,141
  2. Specialty average3,176

Most prescribed

  1. Amlodipine Besylate787 claims
  2. Lisinopril718 claims
  3. Atorvastatin Calcium552 claims
  4. Levothyroxine Sodium518 claims
  5. Metoprolol Succinate506 claims
  6. Rosuvastatin Calcium380 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: $147.14

7 payments; by number, the most common kind was food and beverage; the largest payer was Lilly USA, LLC. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Marc Merbaum$147.14
  2. Specialty average$1,303.06

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

Marc O. Merbaum among 2,604 internal medicine physician records in Missouri

Marc O. Merbaum, M.D. is one of 2,604 internal medicine physician records with a practice address in Missouri. 77% 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 8% of them.

  • NPI issued2006 · 8% of these records are older, 59% newer
  • In a Medicare fileYes · 77% of these records are
  • In the CMS Doctors and Clinicians fileNo · 55% of these records are
  • Record last updated2017 · 48% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

941 internal medicine physician records list a practice address in Saint Louis

They are 941 of the 27,605 NPPES records with a practice address in Saint Louis, and 2,604 internal medicine physician records in Missouri.

All 2,604 in Missouri → Every provider in Saint Louis → Internal Medicine Physician nationwide →

The 8 internal medicine physician records with the nearest ZIP codes

  1. Christopher Bowe, MDSaint Louis, MO 631281003816976
  2. Curt Calcaterra, M.D.Saint Louis, MO 631281205827557
  3. Kathleen Cizek, M.D.Saint Louis, MO 631281083605331
  4. Robert Curtin, MDSaint Louis, MO 631281538169495
  5. James Ebel, M.D.Saint Louis, MO 631281174504146
  6. Michael Fedak, M.D.Saint Louis, MO 631281174514384
  7. Patrick Garrett, M.D.Saint Louis, MO 631281669466629
  8. Robert Geekie, M.D.Saint Louis, MO 631281528059730

Common questions

What is Marc O. Merbaum, M.D.'s NPI number?

Marc O. Merbaum, M.D.'s National Provider Identifier (NPI) is 1245204338, issued on Feb 15, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Marc O. Merbaum, M.D. located?

The NPPES record lists a practice address at 5034 Griffin RD, Saint Louis, MO, 63128. Phone: (314) 843-7333. Providers update this record themselves, so call before visiting.

How can I verify Marc O. Merbaum, M.D.'s license?

NPPES lists Missouri license number 116179, 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 Marc O. Merbaum, M.D. prescribe under Medicare Part D?

In 2024, Marc O. Merbaum, M.D. had 13,141 Medicare Part D claims for 805 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.