Robin L. Obenchain, MD
NPI 1508829094ActiveIndividual· Internal Medicine, Hematology & Oncology· Chandler, AZ
Internal Medicine, Hematology & Oncology (MD) in Chandler, Arizona, trained at Virginia Commonwealth University, School of Medicine (class of 1999). Their prescriptions cost Medicare Part D more than their services did: $1,010,258 for 831 claims, against $108,497 paid for services in 2024. Pfizer Inc. reported $30.65 in payments in 2025, mostly education.
Overview
| NPI | 1508829094 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Apr 7, 2006 |
| Last updated in NPPES | Feb 23, 2026 |
| Certified by provider | Feb 23, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | 35188 | AZ |
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 - Medical Oncology (AZ) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 315 |
|---|---|
| Services billed | 1,912 across 10 procedure codes |
| Paid by Medicare | $108,497 |
Part D prescriptions in 2024
| Prescriptions (claims) | 831 · 1,227 30-day fills |
|---|---|
| Patients | 197 |
| Total drug cost | $1,010,258 |
| Generic share | 84% of claims |
Education and affiliations
| Medical school | Virginia Commonwealth University, School of Medicine |
|---|---|
| Graduation year | 1999 |
| Medicare specialty | Medical Oncology |
| Telehealth | Offers telehealth |
Medical group
- Honorhealth AmbulatoryScottsdale, AZ · 630 clinicians
Hospital affiliations
- Chandler Regional Medical CenterChandler, AZ
- Honor Health John C. Lincoln Medical CenterPhoenix, AZ
Industry payments (Open Payments)
- 2025$30.65 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $30.65 | 1 |
What the 2025 payments were for
- Education$30.65 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Hematology & Oncology providers in Chandler
- 1447473376
- 1609187418
- 1063892297
- 1740269299
- 1114900479
- 1265846513
- 1215270947
- 1508973447
- 1740254457
- 1053385765
- 1487871786
- 1912168535
All Internal Medicine, Hematology & Oncology providers in Arizona →