Mary G. Mezher, DO
Internal Medicine Physician · Muskegon, MI
Mary G. Mezher, DO is an internal medicine physician with a practice address in Muskegon, Michigan, and NPI 1124686365, issued on Jun 3, 2019. Check the license (Michigan 5101026939, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- Mary G. Mezher
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 5101026939 MI
Self-reported in NPPES; status is on the state search - Practice location
- 1500 E Sherman Blvd, Muskegon, MI 49444
- Phone
- (231) 672-3883
- Enumerated
- Jun 3, 2019
- Record last updated
- Aug 29, 2022
- Fax
- (231) 672-3973
- Medicare enrollment
- Enrolled (PECOS I20220803002877); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 5,735 in Michigan → Look up another NPI →
Also registered at 1500 E Sherman Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Leslie Adkins, PA-CPhysician Assistant1457579849
- Irteza Afzal, MDStudent in an Organized Health Care Education/Training Program1558105296
- Theourrn Amalathasan, MDStudent in an Organized Health Care Education/Training Program1689366767
- Robin Anderson, NPNurse Practitioner1326188004
- Nathan Arnold, DOEmergency Medicine Physician1598784167
- Kaitlyn Averill, RN, AGCNS-BCRegistered Nurse1891534392
Verify Mary G. Mezher in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 5101026939Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average internal medicine physician in 2024
118 Medicare Part D claims for 64 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.
Most prescribed
- Metoprolol Succinate13 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 94.5 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $72.94
3 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie 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.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Mercy Specialty ServicesMuskegon, MI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mary G. Mezher among 5,735 internal medicine physician records in Michigan
Mary G. Mezher, DO 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 2019, is newer than 76% of them.
- NPI issued2019 · 76% of these records are older, 21% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2019 · median 2006 among the 3,564 with a school on file
- Record last updated2022 · 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
- Michael Bergquist, DOMuskegon, MI 494441174570303
- Wayne Brenneman, M.D.Muskegon, MI 494441346228913
- Don Campbell, MDMuskegon, MI 494441184601957
- Amy Dean, D.O.Muskegon, MI 494441982615357
- Dennis Desimone, DOMuskegon, MI 494441467468934
- Daniel Farrell, M.D.Norton Shores, MI 494441336144260
- James Grace, MDMuskegon, MI 494441215914023
- Hikmat Halasa, MDMuskegon, MI 494441386735447
Common questions
What is Mary G. Mezher, DO's NPI number?
Mary G. Mezher, DO's National Provider Identifier (NPI) is 1124686365, issued on Jun 3, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Mary G. Mezher, DO located?
The NPPES record lists a practice address at 1500 E Sherman Blvd, Muskegon, MI, 49444. Phone: (231) 672-3883. Providers update this record themselves, so call before visiting.
How can I verify Mary G. Mezher, DO's license?
NPPES lists Michigan license number 5101026939, 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 Mary G. Mezher, DO prescribe under Medicare Part D?
In 2024, Mary G. Mezher, DO had 118 Medicare Part D claims for 64 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Mary G. Mezher, DO's MIPS final score?
The 2023 MIPS final score is 94.5 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.