MARCUS MAYUS M.D.
NPI 1073734935
Internal Medicine in Greenwich, CT

Q: What is Marcus Mayus's NPI number?

The NPI number for Marcus Mayus is 1073734935. It was assigned to this individual provider in the NPPES registry on May 1, 2007.

Q: What is Marcus Mayus's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Q: When was this NPI record last updated?

The NPPES record for Marcus Mayus was last updated on May 31, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since May 01, 2007PECOS EnrolledAccepts Medicare AssignmentCLIA 07D1076743 · Waiver

94.17/100

CMS Quality Rating

81 HOLLY HILL LN FL 3, GREENWICH, CT 06830(203) 869-5515(203) 661-2918 Get Directions Write a Review

NPPES record last updated: May 31, 2022. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Dec 6, 2021, Nov 24, 2021 (2 updates tracked since 2021).

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About Marcus Mayus M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MARCUS MAYUS M.D. (NPI 1073734935) is an individual internal medicine provider in Greenwich, Connecticut, licensed in Connecticut (045877) and active in the NPI registry since May 2007. He is enrolled in Medicare PECOS, holds a CLIA Waiver certificate valid through March 31, 2028, and is a graduate of New York Medical College (2004).

NPPES Registry Identity

NPI1073734935

Entity TypeIndividualMale

Primary Taxonomy207R00000X

Provider Legal NameMARCUS MAYUSCredential: M.D.

Location Address81 HOLLY HILL LN FL 3Greenwich, CT 06830-6071

Mailing Address81 Holly Hill Ln Fl 3Greenwich, CT 06830-6071 · (203) 884-8420 · Fax (833) 906-2492

Phone(203) 869-5515

Fax(203) 661-2918

Sole ProprietorYes

Medical School CMSNew York Medical CollegeGraduated 2004

Enumeration DateMay 1, 2007

Last NPPES UpdateMay 31, 20222 updates tracked since enumeration

NPPES CertifiedMay 31, 2022

✔ NPI 1073734935 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in CT · 045877

Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

81 HOLLY HILL LN FL 3, Greenwich, CT 06830

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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Marcus Mayus M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID345315180

PECOS Enrollment IDI20080813000806

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Marcus Mayus reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Marcus Mayus MD Inc

Same address

Internal Medicine

81 HOLLY HILL LN FL 3
Greenwich, CT 06830

Reassigned Medicare billing, Connecticut enrollment
2 clinicians in this Medicare group

NPI 1780341743 (203) 869-5515

Gandelman Cardiology, PC

0.1 mi

Cardiovascular Disease

81 HOLLY HILL LN FL 3
Greenwich, CT 06830

Reassigned Medicare billing, Connecticut enrollment
4 clinicians in this Medicare group

NPI 1629264353 (203) 869-5515

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Waiver 07D1076743

Marcus Mayus MD, Inc · Greenwich, CT

Active · expires Mar 31, 2028

CLIA Number07D1076743

Laboratory TypePhysician Office

Certificate Effective DateApril 1, 2026

Certificate Expiration DateMarch 31, 2028

Laboratory DirectorMarcus Mayus, MD

Laboratory Phone(203) 884-8420

Laboratory LocationMarcus Mayus MD, Inc81 Holly Hill Ln, 3rd Flr, Greenwich, CT 06830

CLIA data matches this NPI record on: Name Phone

This certificate is issued to a laboratory to perform only waived tests.

Areas of Expertise CMS Part B claims 25

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month 99490

Chronic care management services involve a healthcare professional directing clinical staff in managing your chronic conditions. This includes the first 20 minutes per month of services like medication management, care coordination, and health monitoring to help improve your health and quality of life.

3,235 services423 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

2,595 services933 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

966 services703 patients

Telephone medical discussion with physician, 21-30 minutes 99443

This service involves a 21-30 minute phone conversation with a physician. It's a chance for you to discuss your health concerns, symptoms or treatment plans. It's similar to an in-person consultation, but conducted over the phone for your convenience and safety.

761 services487 patients

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report 93000

An electrocardiogram (ECG) is a non-invasive test that records your heart's electrical activity. Using 12 leads attached to your body, it captures data to help identify heart conditions. A doctor interprets the results and provides a report.

575 services533 patients

Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439

An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.

453 services453 patients

Amplifed dna or rna probe detection of severe acute respiratory syndrome coronavirus 2 (covid-19) antigen 87635

This is a lab test that detects the presence of COVID-19 in your body. It uses a technique to amplify the virus's genetic material, either DNA or RNA, making it easier to identify. A positive result indicates an active infection.

392 services272 patients

Telephone medical discussion with physician, 11-20 minutes 99442

This is a service where you have a phone conversation with your doctor for 11-20 minutes. It's used for discussing health concerns, reviewing test results, or managing ongoing conditions. It's a convenient way to receive medical advice without an in-person visit.

318 services250 patients

Annual depression screening, 5 to 15 minutes G0444

An annual depression screening is a short, routine evaluation to check for signs of depression. It involves answering a series of questions about your feelings, thoughts, and behaviors. The process takes about 15 minutes and helps detect depression early for better management.

301 services301 patients

Detection test by nucleic acid for multiple types influenza virus 87502

A detection test by nucleic acid for multiple types of influenza virus is a diagnostic procedure. It identifies the genetic material of the virus in your body. It's highly accurate and can distinguish between different flu strains, helping in prompt and precise treatment.

275 services207 patients

Injection of drug or substance under skin or into muscle 96372

This procedure involves administering medication directly under the skin or into a muscle. A small needle is used to inject the drug, allowing it to be absorbed quickly into the bloodstream. It's a common method for delivering a variety of medications.

225 services87 patients

Detection test by nucleic acid for respiratory syncytial virus, amplified probe technique 87634

This test identifies the presence of the Respiratory Syncytial Virus (RSV) in your body. It uses a technique called the amplified probe, which increases the amount of viral genetic material, making it easier to detect. This helps in diagnosing RSV infections accurately.

219 services167 patients

Administration of influenza virus vaccine G0008

The administration of the influenza virus vaccine, also known as the flu shot, is a simple procedure to protect against the flu. A healthcare provider injects a small dose of the vaccine into your arm. This stimulates your immune system to produce antibodies, which will help your body fight off the flu if exposed.

174 services173 patients

Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg J3420

This is a procedure where a small dose of Vitamin B-12, also known as Cyanocobalamin, is injected into your body. This vitamin is essential for nerve function and the production of red blood cells. It's often used to treat vitamin B-12 deficiency.

155 services45 patients

Influenza vaccine, inactivated 90653

The Influenza vaccine, inactivated, is a shot given to protect against the flu. It contains killed virus particles that help your body build immunity to the flu. It's recommended annually to keep your protection up-to-date. It's safe for ages 6 months and up.

140 services140 patients

Urinalysis, manual test 81002

A urinalysis is a simple, non-invasive test that checks the urine for various elements such as sugar, protein, and signs of infection. It can help detect many common conditions, including kidney disease and diabetes. The manual test involves a lab technician examining a urine sample.

130 services100 patients

Chronic care management services for two or more chronic conditions, first 30 minutes provided personally by health care professional, per calendar month 99491

Chronic care management services involve a healthcare professional personally providing care for patients with two or more chronic conditions. This service, offered monthly, focuses on the first 30 minutes of care, helping manage and coordinate the patient's health needs.

112 services28 patients

Detection test by nucleic acid for strep (streptococcus, group a), amplified probe technique 87651

This test detects Group A Streptococcus bacteria in your body. It uses an amplified probe technique, which amplifies the bacteria's nucleic acid, making it easier to identify. This test helps diagnose conditions like strep throat or scarlet fever.

105 services82 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

86 services86 patients

Administration and interpretation of patient-focused health risk assessment 96160

This procedure involves a detailed evaluation of your health to identify potential risks. It includes analyzing your medical history, lifestyle habits, and family health history. The results are interpreted to provide a personalized plan to improve your health and prevent future issues.

53 services53 patients

Removal of impacted ear wax 69210

Impacted ear wax removal is a safe procedure to clear blockages in the ear canal caused by hardened ear wax. A healthcare professional uses specialized tools or a gentle irrigation method to loosen and remove the wax, improving hearing and alleviating discomfort.

41 services36 patients

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

41 services37 patients

Initial preventive physical examination; face-to-face visit, services limited to new beneficiary during the first 12 months of medicare enrollment G0402

An Initial Preventive Physical Examination, also known as a "Welcome to Medicare" visit, is a one-time, face-to-face visit during your first 12 months of Medicare enrollment. It includes a review of your health, as well as education and counseling about preventive services and further screenings.

36 services36 patients

Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month 99439

Chronic Care Management services involve regular check-ins with healthcare professionals to manage two or more chronic conditions. It includes an additional 20 minutes of clinical staff time per month, directed by a healthcare professional, to ensure optimal health management.

31 services29 patients

Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit G0438

An annual wellness visit is a yearly appointment with your doctor to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's an opportunity to discuss your health status and goals and get a plan tailored for you.

18 services18 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 06830 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$138.84 typical visit price

range $60.82 – $183.10

Typical copayment $34.71 (range $15.20 – $45.77)

Most-billed visit code 99204

Established Patient

$106.68 typical visit price

range $19.76 – $149.26

Typical copayment $26.67 (range $4.94 – $37.31)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

94.17/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored through an Alternative Payment Model

Quality

81.94

Promoting Interoperability

99.39

Improvement Activities

Reported Quality Measures

Appropriate Treatment for Upper Respiratory Infection (URI)

21%125 patients1/55-star benchmark: 100%

Breast Cancer Screening

52%1,032 patients3/55-star benchmark: 93%

Cervical Cancer Screening

31%1,360 patients2/55-star benchmark: 98%

Closing the Referral Loop: Receipt of Specialist Report

23%500 patients2/55-star benchmark: 87%

Controlling High Blood Pressure

78%812 patients4/55-star benchmark: 91%

Diabetes: Eye Exam

2%407 patients1/55-star benchmark: 100%

Diabetes: Hemoglobin A1c (HbA1c) Poor Control (>9%)

Lower rates are better for this measure.

34%407 patients3/55-star benchmark: 91%

Documentation of Current Medications in the Medical Record

76%12,800 patients3/55-star benchmark: 100%

Falls: Screening for Future Fall Risk

6%1,743 patients1/55-star benchmark: 100%

HIV Screening

4%3,533 patients1/55-star benchmark: 60%

Preventive Care and Screening: Body Mass Index (BMI) Screening and Follow-Up Plan

31%4,834 patients2/55-star benchmark: 98%

Preventive Care and Screening: Screening for Depression and Follow-Up Plan

2%4,617 patients1/55-star benchmark: 97%

Preventive Care and Screening: Screening for High Blood Pressure and Follow-Up Documented

23%8,917 patients2/55-star benchmark: 61%

Preventive Care and Screening: Tobacco Use: Screening and Cessation Intervention

Patients screened: 1% · 4,774 patients

1%4,774 patients

Statin Therapy for the Prevention and Treatment of Cardiovascular Disease

67%766 patients3/55-star benchmark: 91%

Use of High-Risk Medications in Older Adults

Lower rates are better for this measure.

Patients appropriateDiagnosis: 4% · 1,728 patients

Patients totalRate: 13% · 1,848 patients

12%1,848 patients3/55-star benchmark: 100%

Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Referred Medical Equipment & Supplies CMS DME claims 2

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253

DME-Other DME · category DE017N

14 suppliers47 claims128 services$5.22 avg. paid by Medicare

Lancets, per box of 100 A4259

DME-Medical/Surgical Supplies · category DA000N

8 suppliers23 claims34 services$1.09 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 5

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. GLENN GANDELMAN MD

Internal Medicine (Cardiovascular Disease)