Nicolaas Martin Grobler Jr., MD
NPI 1720154255ActiveIndividual· Internal Medicine, Pulmonary Disease· Upland, CA
Internal Medicine, Pulmonary Disease (MD) with Inland Physicians Pulmonary Services and 1 other group, practicing in Upland, California. Their prescriptions cost Medicare Part D more than their services did: $1,876,632 for 14,468 claims, against $175,173 paid for services in 2024. Glaxosmithkline, LLC. was the largest of 22 companies reporting payments in 2025, $2,628 in all, mostly food and beverage. Lists Casa Colina Hospital and 3 other hospitals as hospital affiliations.
Overview
| NPI | 1720154255 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Nov 27, 2006 |
| Last updated in NPPES | Nov 16, 2021 |
| Certified by provider | Jul 27, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Pulmonary Disease Primary | 207RP1001X | A89047 | CA |
| Internal Medicine | 207R00000X | A89047 | CA |
| Internal Medicine, Critical Care Medicine | 207RC0200X | A89047 | CA |
| Hospitalist | 208M00000X | A89047 | CA |
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 - Pulmonary Disease (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 396 |
|---|---|
| Services billed | 1,917 across 41 procedure codes |
| Paid by Medicare | $175,173 |
Part D prescriptions in 2024
| Prescriptions (claims) | 14,468 · 28,799 30-day fills |
|---|---|
| Patients | 1,047 |
| Total drug cost | $1,876,632 |
| Generic share | 85% of claims |
Education and affiliations
| Graduation year | 2000 |
|---|---|
| Medicare specialty | Pulmonary Disease |
| Secondary specialties | Critical Care (Intensivists), Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Inland Physicians Pulmonary ServicesPomona, CA · 7 clinicians
- Grobler Enterprises IncUpland, CA · 3 clinicians
Hospital affiliations
- Casa Colina HospitalPomona, CA
- Montclair Hospital Medical CenterMontclair, CA
- Pomona Valley Hospital Medical CenterPomona, CA
- San Antonio Regional HospitalUpland, CA
Other facilities
- Lorian HealthHome health agency · Riverside, CA
Industry payments (Open Payments)
- 2025$2,628 · 116 payments from 22 companies
- 2024$1,869 · 92 payments from 24 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Glaxosmithkline, LLC. | $607.92 | 32 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $219.59 | 13 |
| Regeneron Healthcare Solutions, Inc. | $204.77 | 6 |
| Genzyme Corporation | $203.31 | 9 |
| Astrazeneca Pharmaceuticals LP | $179.62 | 13 |
What the 2025 payments were for
- Food and Beverage$2,611 · 115 payments
- Education$17.38 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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