Marcus Mayus, M.D.
NPI 1073734935 · Internal Medicine Physician · Greenwich, CT
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marcus Mayus, M.D. is a Internal Medicine Physician provider in Greenwich, CT (NPI 1073734935).
Provider details
- NPI number
- 1073734935
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 045877 (CT)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
11,142 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Chronic Care Management Services, First 20 Minutes of Clinical Staff Time Directed By Health Care Professional, Per Calendar Month99490 | 3,235 | $65 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 2,595 | $132 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 966 | $94 |
| Telephone Medical Discussion With Physician, 21-30 Minutes99443 | 761 | $122 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 575 | $15 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent Visit |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 204 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 927 | 249 |
| Rosuvastatin Calcium | 837 | 266 |
| Atorvastatin Calcium | 836 | 240 |
| Losartan Potassium | 543 | 163 |
| Amlodipine Besylate | 518 | 167 |
| Pantoprazole Sodium | 476 | 162 |
| Metformin Hcl |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$5,375 across 243 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-05-01
- Last updated
- 2022-05-31
- Certified
- 2022-05-31
Frequently asked questions
- What is Marcus Mayus's NPI number?
- Marcus Mayus's National Provider Identifier (NPI) is 1073734935, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marcus Mayus's specialty?
- Marcus Mayus is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Marcus Mayus located?
- Marcus Mayus's practice location on file with NPPES is 81 Holly Hill Ln Fl 3, Greenwich, CT 06830-6071.
- What is Marcus Mayus's phone number?
- The practice phone number listed in the NPPES registry for Marcus Mayus is (203) 869-5515.
- Does Marcus Mayus accept Medicare?
- Marcus Mayus is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marcus Mayus's NPI active?
- Yes — Marcus Mayus's NPI (1073734935) is active in the NPPES registry as of the last update on 2022-05-31.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.