NPPES file of Aug 9, 2026

Gregory Allan Holton, M.D.

Internal Medicine Physician · Muskegon, MI

Gregory Allan Holton, M.D. is an internal medicine physician with a practice address in Muskegon, Michigan, and NPI 1194136556, issued on May 19, 2014. Check the license (Michigan 4301116240, as entered in NPPES) on the Michigan Board of Medicine (LARA); 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
1194136556
Name
Gregory Allan Holton
Credential
M.D.
Primary taxonomy
Internal Medicine Physician 207R00000X
License numbers
4301116240 MI
BP10049459 TX
Self-reported in NPPES; status is on the state search
Practice location
1675 Leahy St Ste 201A, Muskegon, MI 49442
Phone
(231) 672-7800
Enumerated
May 19, 2014
Record last updated
May 11, 2020 (not updated in 6 years: call before relying on the address or phone)
Fax
(231) 672-7801
Medicare enrollment
Enrolled (PECOS I20200519002127); may accept Medicare assignment
Medical or professional school
Baylor College Of Medicine, 2014
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest internal medicine physician records → All 5,735 in Michigan → Look up another NPI →

Also registered at 1675 Leahy St Ste 201A

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

  1. Katherine Betcher, M.D.Obstetrics & Gynecology Physician1164862033
  2. Chantal Boone, DOInternal Medicine Physician1073008017
  3. Gary Doublestein, D.O.Obstetrics & Gynecology Physician1760445571
  4. Peyton Faganel, DOInternal Medicine Physician1104311604
  5. Suzanne Galloway, M.D.Obstetrics & Gynecology Physician1033319181
  6. Lauryn Przeslawski, D.O.Obstetrics & Gynecology Physician1134501562

Verify Gregory Allan Holton in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
    Search for license 4301116240    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 Michigan 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.

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96% more Medicare Part D claims than the average internal medicine physician in 2024

6,214 Medicare Part D claims for 489 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims. 403 claims were for opioids.

  1. Gregory Holton6,214
  2. Specialty average3,176

Most prescribed

  1. Atorvastatin Calcium425 claims
  2. Hydrocodone-Acetaminophen249 claims
  3. Amlodipine Besylate230 claims
  4. Omeprazole193 claims
  5. Metoprolol Succinate173 claims
  6. Levothyroxine Sodium171 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: $51.57

3 payments; by number, the most common kind was food and beverage; the largest payer was Novo Nordisk Inc. 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. Gregory Holton$51.57
  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.

Gregory Allan Holton among 5,735 internal medicine physician records in Michigan

Gregory Allan Holton, M.D. is one of 5,735 internal medicine physician records with a practice address in Michigan. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 64% of them.

  • NPI issued2014 · 64% of these records are older, 34% newer
  • In a Medicare fileYes · 79% of these records are
  • In the CMS Doctors and Clinicians fileYes · 62% of these records are
  • Graduated2014 · median 2006 among the 3,564 with a school on file
  • Record last updated2020 · 54% 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 Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

47 internal medicine physician records list a practice address in Muskegon

They are 47 of the 2,646 NPPES records with a practice address in Muskegon, and 5,735 internal medicine physician records in Michigan.

All 5,735 in Michigan → Every provider in Muskegon → Internal Medicine Physician nationwide →

The 8 internal medicine physician records with the nearest ZIP codes

  1. Chantal Boone, DOMuskegon, MI 494421073008017
  2. Nancy Brenneman, M.D.Muskegon, MI 494421316925993
  3. Ronald Chusid, D.O.Muskegon, MI 494421841379260
  4. Peyton Faganel, DOMuskegon, MI 494421104311604
  5. Julie Felt, MD,MMMMuskegon, MI 494421497940571
  6. Jon Hinderer, D.O.Muskegon, MI 494421033102272
  7. Pedro Mejia Garagorry, MDMuskegon, MI 494421497919286
  8. Marcela Novakosky, MDMuskegon, MI 494421700863503

Common questions

What is Gregory Allan Holton, M.D.'s NPI number?

Gregory Allan Holton, M.D.'s National Provider Identifier (NPI) is 1194136556, issued on May 19, 2014. An NPI identifies a provider in billing; it is not a license.

Where is Gregory Allan Holton, M.D. located?

The NPPES record lists a practice address at 1675 Leahy St Ste 201A, Muskegon, MI, 49442. Phone: (231) 672-7800. Providers update this record themselves, so call before visiting.

How can I verify Gregory Allan Holton, M.D.'s license?

NPPES lists Michigan license number 4301116240, as entered by the provider. Search the Michigan Board of Medicine (LARA) at https://aca-prod.accela.com/MILARA/GeneralProperty/PropertyLookUp.aspx?isLicensee=Y&TabName=APO. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Gregory Allan Holton, M.D. prescribe under Medicare Part D?

In 2024, Gregory Allan Holton, M.D. had 6,214 Medicare Part D claims for 489 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.