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
- Record last updated
- May 31, 2022
- Fax
- (203) 661-2918
- Medicare enrollment
- Enrolled (PECOS I20080813000806); accepts Medicare assignment
- Medical or professional school
- New York Medical College, 2004
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,623 in Connecticut → Look up another NPI →
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, MDCardiovascular Disease Physician1033117437
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
5.4 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 3,176 among the 108,855 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 MIPS final score for 2023 (Medicare payment program): 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; 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
- Marcus Mayus MD IncGreenwich, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Marcus Mayus among 2,623 internal medicine physician records in Connecticut
Marcus Mayus, M.D. is one of 2,623 internal medicine physician records with a practice address in Connecticut. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 48% of them.
- NPI issued2007 · 48% of these records are older, 44% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2004 · median 2004 among the 1,646 with a school on file
- Record last updated2022 · 61% 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 Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
54 internal medicine physician records list a practice address in Greenwich
They are 54 of the 1,184 NPPES records with a practice address in Greenwich, and 2,623 internal medicine physician records in Connecticut.
All 2,623 in Connecticut → Every provider in Greenwich → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Anthony Alleva, MDGreenwich, CT 068301518938778
- Joseph Andrews, M.D.Greenwich, CT 068301740280411
- Allen Chodock, MDGreenwich, CT 068301811928138
- John Delvecchio, MDGreenwich, CT 068301619990868
- Stephen Jones, M.D.Greenwich, CT 068301174547038
- Ellika Mardh, M.D.Greenwich, CT 068301235150145
- Mohammad Reza Moienafshari, M.D.Greenwich, CT 068301154396893
- Marcelyn Molloy, MDGreenwich, CT 068301053301358
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 3,176. Part D covers Medicare prescriptions only.
What is Marcus Mayus, M.D.'s MIPS final 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), 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.