Dr. Marcus A. Mayus, MD
- Medicare services, 2024
- 11,466
- Medicare patients, 2024
- 1,213
- Part D claims, 2024
- 17,140
- Hospital affiliations
- 4
- Industry payments
- $33,002
- Practice address
- 81 Holly Hill Ln, Greenwich, CT 06830
- Practice phone
- Call (203) 869-5515
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Marcus Mayus MD Inc
Greenwich, Connecticut
Find Dr. Mayus' professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Marcus A. Mayus is an internist in Greenwich, Connecticut
Dr. Mayus practices at Marcus Mayus MD Inc in Greenwich, Connecticut.
Dr. Mayus' NPI, 1073734935, was assigned on May 1, 2007. Dr. Mayus graduated from New York Medical College in 2004. Dr. Mayus holds Connecticut license 045877.
- NPI
- 1073734935NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0345315180
- NPI enumeration date
- May 1, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (203) 869-5515
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 48
- Medical school graduation
- 2004
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Marcus A. Mayus practices at Marcus Mayus MD Inc in Greenwich, Connecticut
Dr. Mayus' primary practice is Marcus Mayus MD Inc, at 81 Holly Hill Ln, Greenwich, CT 06830 in Western Ct County. The practice phone is (203) 869-5515.
- Marcus Mayus MD Inc81 Holly Hill Ln, Greenwich, CT 06830 · Western Ct CountyPhone(203) 869-5515
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Marcus A. Mayus is affiliated with 14 sites of care and 3 medical groups
Dr. Mayus' primary practice is Marcus Mayus MD Inc in Greenwich, Connecticut. Dr. Mayus is also affiliated with Greenwich Hospital. The medical group on file is Rehabilitation Associates, Inc. Dmand AI also links Dr. Mayus to 3 more hospitals, 5 home health agencies, 2 group practices and clinics, 2 medical groups, 1 therapy and rehab clinic and 1 skilled nursing facility, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Marcus A. Mayus' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mayus practices, 13 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Marcus Mayus MD Inc | Available with a free account |
| +13 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Marcus A. Mayus is one of 2,189 internists in Connecticut
Internal medicine is Dr. Mayus' primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Mayus is licensed in Connecticut.
Specialties and state licenses
- Internal medicine, ConnecticutPrimary
Internists near Dr. Mayus
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Marcus A. Mayus billed Medicare for 11,466 services in 2024
CMS data shows 11,466 Medicare services from Dr. Mayus across 26 procedure codes in 2024, for 1,213 Medicare patients. Medicare paid $744,574 for them. Every service was in an office.
Dr. Mayus' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 7,3372024: 8,14511%
- Lab and pathology
- 2023: 8012024: 1,12140%
- Tests and treatments
- 2023: 1,3272024: 99325%
- Other services
- 2023: 9862024: 982No change
- Drugs given in the office
- 2023: 2642024: 18430%
- Surgery
- 2023: 462024: 4111%
Dr. Mayus compared with the Connecticut median for internists, 2024
- Dr. Mayus
- Connecticut median
- Medicare services
- 11,466vs 39029.4 times
- Medicare patients
- 1,213vs 1727.1 times
- Part D claims
- 16,259vs 34347.4 times
Medians across 2,185 internists in Connecticut with Dmand AI profiles that report each measure.
Dr. Mayus' most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Mayus?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Mayus and other internists in Connecticut.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Marcus A. Mayus treated 1,213 Medicare patients in 2024, average age 76
CMS counts 1,213 Medicare patients who saw Dr. Mayus in 2024. The largest group is 65 to 74, with 473 patients. 75% of them have high cholesterol, and 68% have arthritis. 9% are also on Medicaid. Their average risk score is 1.02, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Mayus' median patient age at 63, with 46% women.
Dr. Mayus' Medicare patients by age, 2024
Dr. Mayus' Medicare patients by sex, 2024
- Women65354%
- Men56046%
Chronic conditions among Dr. Mayus' Medicare patients, 2024
- High cholesterol75%
- Arthritis68%
- High blood pressure64%
- Anxiety22%
- Diabetes21%
- Ischemic heart disease21%
- Atrial fibrillation18%
- Cancer17%
Share of Medicare patients with each condition. A patient can have several.
Dr. Mayus' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 63
Patient panel by sex, all payers
- Women46%
- Men51%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Marcus A. Mayus wrote 17,140 Medicare Part D claims in 2024
In 2024, Dr. Mayus wrote 17,140 Medicare Part D claims for 1,459 patients. 88% of them were for generic drugs. CMS names the drug for 16,259 of them, across 203 drugs with 11 or more claims each, at $1,611,401 in total drug cost. In 2023, CMS named 15,575 claims across 206 drugs.
Dr. Mayus' Part D claims by kind of drug, 2024
- Generic15,141 claims88%
- Brand-name1,945 claims11%
- Other54 claims0%
Dr. Mayus' most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Mayus' Part D claims, 2024
- Opioids1%177 of 17,140 claims
- Antibiotics6%1,108 of 17,140 claims
- Antipsychotics, patients 65 and over1%142 of 17,140 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 15,5752024: 16,2594%
Drugs named by CMS: 203 in 2024, 206 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Marcus A. Mayus offers telehealth to Medicare patients
Dr. Mayus accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Mayus as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Removal of tissue: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Marcus A. Mayus received $33,002 in industry payments from 2016 to 2025
CMS Open Payments shows 1,805 general payments to Dr. Mayus from 93 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 99% of the total. Abbvie Inc. paid the most, $7,105.
General payments to Dr. Mayus by program year, 2016 to 2025
General payments to Dr. Mayus by kind, 2016 to 2025
- Food and beverage$32,70699%
- Education$2711%
- Speaker and faculty fees$240%
Companies that paid Dr. Mayus the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Marcus A. Mayus graduated from New York Medical College
Dr. Mayus graduated from New York Medical College in 2004.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Marcus A. Mayus's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Marcus A. Mayus
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Marcus A. Mayus' NPI number?
Dr. Marcus A. Mayus' NPI number is 1073734935. It was assigned on May 1, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Marcus A. Mayus?
Dr. Marcus A. Mayus is an internist in Greenwich, Connecticut. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Marcus A. Mayus practice?
Dr. Mayus practices at 81 Holly Hill Ln, Greenwich, CT 06830. Dr. Mayus' primary practice is Marcus Mayus MD Inc in Greenwich, Connecticut. Dmand AI also links Dr. Mayus to 3 hospitals, 5 home health agencies, 2 group practices and clinics, 2 medical groups, 1 therapy and rehab clinic and 1 skilled nursing facility.
What is Dr. Marcus A. Mayus' office phone number?
The practice phone on file for Dr. Mayus is (203) 869-5515.
What is Dr. Marcus A. Mayus' medical license number?
Dr. Mayus holds Connecticut license 045877.
Which hospitals is Dr. Marcus A. Mayus affiliated with?
Dr. Mayus is affiliated with Greenwich Hospital. Dmand AI links Dr. Mayus to 3 more hospitals.
What medical group is Dr. Marcus A. Mayus part of?
Dr. Mayus is linked to Rehabilitation Associates, Inc. Dmand AI links Dr. Mayus to 2 more medical groups.
Does Dr. Marcus A. Mayus accept Medicare?
Yes. CMS data shows Dr. Mayus billed Medicare for 11,466 services in 2024, and Dr. Mayus accepts Medicare assignment.
Does Dr. Marcus A. Mayus offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Mayus as offering telehealth services.
How many Medicare patients does Dr. Marcus A. Mayus see?
CMS counts 1,213 Medicare patients who saw Dr. Mayus in 2024, with an average age of 76.
Show 5 more questionsShow fewer questions
What services does Dr. Marcus A. Mayus bill to Medicare?
In 2024, Dr. Mayus' most billed Medicare services were care management and other visits (99490), office visit, established patient (99214) and office visit, established patient (99213).
Where did Dr. Marcus A. Mayus go to medical school?
Dr. Mayus graduated from New York Medical College in 2004.
What drugs does Dr. Marcus A. Mayus prescribe most?
In 2024 Medicare Part D data, Dr. Mayus' most prescribed drugs by claims were Levothyroxine Sodium, Rosuvastatin Calcium and Atorvastatin Calcium.
Has Dr. Marcus A. Mayus received payments from drug or device companies?
CMS Open Payments shows $33,002 in general payments to Dr. Mayus from 93 companies from 2016 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Marcus A. Mayus been practicing?
Dr. Mayus graduated from medical school in 2004, 22 years ago.
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