Marcus Mayus MD Inc
NPI 1780341743 · Internal Medicine Physician · Greenwich, CT
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marcus Mayus MD Inc is a Internal Medicine Physician organization in Greenwich, CT (NPI 1780341743).
Provider details
- NPI number
- 1780341743
- Entity type
- Organization
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Marcus Mayus, Physician/Owner(203) 869-5515
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
4 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2021-11-24
- Last updated
- 2021-11-24
- Certified
- 2021-11-24
Frequently asked questions
- What is Marcus Mayus MD Inc's NPI number?
- Marcus Mayus MD Inc's National Provider Identifier (NPI) is 1780341743, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Marcus Mayus MD Inc?
- Marcus Mayus MD Inc is classified in the NPPES registry as Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Marcus Mayus MD Inc located?
- Marcus Mayus MD Inc's practice location on file with NPPES is 81 Holly Hill Ln Fl 3, Greenwich, CT 06830-6071.
- What is Marcus Mayus MD Inc's phone number?
- The practice phone number listed in the NPPES registry for Marcus Mayus MD Inc is (203) 869-5515.
- Does Marcus Mayus MD Inc accept Medicare?
- Marcus Mayus MD Inc is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for Marcus Mayus MD Inc?
- The authorized official listed on Marcus Mayus MD Inc's NPPES record is Marcus Mayus, Physician/Owner. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Marcus Mayus MD Inc's NPI active?
- Yes — Marcus Mayus MD Inc's NPI (1780341743) is active in the NPPES registry as of the last update on 2021-11-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.