Mark Landis, N.P.
NPI 1912128588ActiveIndividual· Nurse Practitioner· Newark, DE
Nurse Practitioner (N.P.) with ENT and Allergy of Delaware LLC, practicing in Newark, Delaware. 1,011 Medicare patients in 2024, $161,972 paid; nearly all of their 1,150 Part D prescriptions were generic (93%). Pfizer Inc. was the largest of 9 companies reporting payments in 2025, $1,028 in all, mostly food and beverage.
Overview
| NPI | 1912128588 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | N.P. |
| Sole proprietor | No |
| NPI issued | May 1, 2007 |
| Last updated in NPPES | Aug 17, 2020 |
| Certified by provider | Aug 17, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner Primary | 363L00000X | L1-0026969 | DE |
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 - Nurse Practitioner (DE) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 1,011 |
|---|---|
| Services billed | 15,302 across 22 procedure codes |
| Paid by Medicare | $161,972 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,150 · 2,173 30-day fills |
|---|---|
| Patients | 331 |
| Total drug cost | $119,706 |
| Generic share | 93% of claims |
Education and affiliations
| Graduation year | 2005 |
|---|---|
| Medicare specialty | Nurse Practitioner |
| Telehealth | Offers telehealth |
Medical group
- ENT and Allergy of Delaware LLCWilmington, DE · 42 clinicians
Industry payments (Open Payments)
- 2025$1,028 · 63 payments from 9 companies
- 2024$899.22 · 56 payments from 9 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $285.97 | 27 |
| Biocryst US Sales Co., LLC | $248.14 | 7 |
| Abbvie Inc. | $216.35 | 17 |
| Csl Behring | $92.14 | 3 |
| Ars Pharmaceuticals Operations, Inc. | $63.84 | 4 |
What the 2025 payments were for
- Food and Beverage$1,028 · 63 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Nurse Practitioner providers in Newark
- 1902282379
- 1295021145
- 1740576602
- 1841586708
- 1194623843
- 1407671704
- 1609750736
- 1760325559
- 1831698075
- 1902569353
- 1679029870
- 1134964067