Marcus Mayus, M.D.
Internal Medicine Physician · Greenwich, CT
Marcus Mayus, M.D. is an internal medicine physician with a practice address in Greenwich, Connecticut, and NPI 1073734935, issued on May 1, 2007. Check the license (Connecticut 045877, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Marcus Mayus
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 045877 CT
Self-reported in NPPES; status is on the state search - Practice location
- 81 Holly Hill LN FL 3, Greenwich, CT 06830
- Phone
- (203) 869-5515
- Enumerated
- May 1, 2007
- Entity
- Type 1 · individual
Also registered at 81 Holly Hill LN FL 3
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Timothy Brandriff, PAPhysician Assistant1740320092
- Glenn Gandelman, MDSpecialist1033117437
Verify Marcus Mayus in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 045877Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
6.2 times the Medicare Part D claims of the average internal medicine physician in 2024
17,140 Medicare Part D claims for 1,459 beneficiaries, against an average of 2,785 among the 127,794 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 177 claims were for opioids.
Most prescribed
- Levothyroxine Sodium927 claims
- Rosuvastatin Calcium837 claims
- Atorvastatin Calcium836 claims
- Losartan Potassium543 claims
- Amlodipine Besylate518 claims
- Pantoprazole Sodium476 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 Medicare quality score for 2023: 94.2 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $5,375.46
243 payments, mostly food and beverage; the largest payer was Abbvie Inc.. The 65,274 providers of this specialty with any payment received $2,536.66 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.
One hospital or facility affiliation
- Marcus Mayus MD IncGreenwich, CT
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.
55 internal medicine physician records list a Greenwich practice address
They are 55 of the 1,184 NPPES records with a Greenwich practice address, and 2,830 internal medicine physician records in Connecticut.
All 55 in Greenwich → All 2,830 in Connecticut → Every provider in Greenwich →
Other internal medicine physician records in Connecticut
- Christina AbavanaBridgeport, CT1508206574
- Hoda Abdel Salam, M.D.New Britain, CT1144509316
- Gada Abdelhafiz, MDNew London, CT1467649558
- Mahmoud Abdelrahman, MDBridgeport, CT1467072868
- Simon Abi-SalehBridgeport, CT1891315529
- Gerard Abidor, D.O.Bridgeport, CT1518014539
- Richard Abraham, M.D.Canton, CT1023044252
- Odaliz Abreu-Lanfranco, MDNew Haven, CT1538276134
- Nila Aburto, MDStamford, CT1396325718
- Angelo Accomando, M.D.East Haven, CT1063454247
Common questions
What is Marcus Mayus, M.D.'s NPI number?
Marcus Mayus, M.D.'s National Provider Identifier (NPI) is 1073734935, issued on May 1, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Marcus Mayus, M.D. located?
The NPPES record lists a practice address at 81 Holly Hill LN FL 3, Greenwich, CT, 06830. Phone: (203) 869-5515. Providers update this record themselves, so call before visiting.
How can I verify Marcus Mayus, M.D.'s license?
NPPES lists Connecticut license number 045877, as entered by the provider. Search the Connecticut Medical Examining Board at https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Marcus Mayus, M.D. prescribe under Medicare Part D?
In 2024, Marcus Mayus, M.D. had 17,140 Medicare Part D claims for 1,459 beneficiaries; the average among internal medicine physician prescribers was 2,785. Part D covers Medicare prescriptions only.
What is Marcus Mayus, M.D.'s Medicare quality score?
The 2023 MIPS final score is 94.2 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.
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.