Mark Gregory Lazarev, M.D.
NPI 1104094739ActiveIndividual· Internal Medicine, Gastroenterology· Baltimore, MD
Internal Medicine, Gastroenterology (M.D.) in Baltimore, Maryland, trained at University of Pittsburgh School of Medicine (class of 2002). Their prescriptions cost Medicare Part D more than their services did: $6,722,176 for 911 claims, against $575,016 paid for services in 2024. Abbvie Inc. was the largest of 21 companies reporting payments in 2025, $2,545 in all, mostly food and beverage.
Overview
| NPI | 1104094739 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Feb 17, 2008 |
| Last updated in NPPES | Feb 11, 2013 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | D69337 | MD |
| Internal Medicine, Gastroenterology | 207RG0100X | MT185907 | PA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Gastroenterology (MD) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 431 |
|---|---|
| Services billed | 35,473 across 53 procedure codes |
| Paid by Medicare | $575,016 |
Part D prescriptions in 2024
| Prescriptions (claims) | 911 · 1,647 30-day fills |
|---|---|
| Patients | 140 |
| Total drug cost | $6,722,176 |
| Generic share | 57% of claims |
Education and affiliations
| Medical school | University of Pittsburgh School of Medicine |
|---|---|
| Graduation year | 2002 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Johns Hopkins UniversityBaltimore, MD · 2,909 clinicians
Hospital affiliations
- Johns Hopkins Bayview Medical CenterBaltimore, MD
- Johns Hopkins Hospital, theBaltimore, MD
- Sibley Memorial HospitalWashington, DC
Industry payments (Open Payments)
- 2025$2,545 · 129 payments from 21 companies
- 2024$7,365 · 151 payments from 27 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $470.71 | 31 |
| Takeda Pharmaceuticals U.S.A., Inc. | $469.00 | 16 |
| Janssen Biotech, Inc. | $358.72 | 22 |
| Madrigal Pharmaceuticals | $261.34 | 7 |
| Celltrion USA Inc. | $198.59 | 19 |
What the 2025 payments were for
- Food and Beverage$2,545 · 129 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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