David Chun Lo, M.D.
NPI 1841602273ActiveIndividual· Internal Medicine· Stamford, CT
Internal Medicine (M.D.) with Marcus Mayus MD Inc, practicing in Stamford, Connecticut. Their prescriptions cost Medicare Part D more than their services did: $245,170 for 3,248 claims, against $47,335 paid for services in 2024. Abbvie Inc. was the largest of 20 companies reporting payments in 2025, $2,069 in all, mostly food and beverage. Lists Greenwich Hospital Association - and 1 other hospital as hospital affiliations.
Overview
| NPI | 1841602273 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | May 20, 2014 |
| Last updated in NPPES | Mar 24, 2025 |
| Certified by provider | Mar 24, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 56452 | CT |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (CT) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 201 |
|---|---|
| Services billed | 607 across 30 procedure codes |
| Paid by Medicare | $47,335 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,248 · 7,756 30-day fills |
|---|---|
| Patients | 522 |
| Total drug cost | $245,170 |
| Generic share | 88% of claims |
Education and affiliations
| Graduation year | 2014 |
|---|---|
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Marcus Mayus MD IncGreenwich, CT · 3 clinicians
Hospital affiliations
- Greenwich Hospital Association -Greenwich, CT
- Stamford HospitalStamford, CT
Other facilities
- Health Care Connectors LLCHome health agency · Greenwich, CT
Industry payments (Open Payments)
- 2025$2,069 · 75 payments from 20 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $321.90 | 22 |
| Novo Nordisk Inc | $179.28 | 7 |
| Amgen Inc. | $159.99 | 4 |
| Phathom Pharmaceuticals, Inc. | $154.59 | 2 |
| Glaxosmithkline, LLC. | $151.09 | 6 |
What the 2025 payments were for
- Food and Beverage$2,009 · 74 payments
- Education$60.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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