Gerard Brophy Chamberlin, MD
NPI 1750503124ActiveIndividual· Internal Medicine· Mesa, AZ
Internal Medicine (MD) in Mesa, Arizona, trained at University of Arizona College of Medicine (class of 2005). Their prescriptions cost Medicare Part D more than their services did: $1,750,289 for 14,609 claims, against $260,037 paid for services in 2024. Astellas Pharma US Inc was the largest of 2 companies reporting payments in 2025, $41.08 in all, mostly food and beverage.
Overview
| NPI | 1750503124 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | May 3, 2007 |
| Last updated in NPPES | Aug 17, 2026 |
| Certified by provider | Aug 17, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 41160 | AZ |
| Pediatrics | 208000000X | 41160 | AZ |
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 (AZ) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 523 |
|---|---|
| Services billed | 4,706 across 87 procedure codes |
| Paid by Medicare | $260,037 |
Part D prescriptions in 2024
| Prescriptions (claims) | 14,609 · 34,427 30-day fills |
|---|---|
| Patients | 954 |
| Total drug cost | $1,750,289 |
| Generic share | 86% of claims |
Education and affiliations
| Medical school | University of Arizona College of Medicine |
|---|---|
| Graduation year | 2005 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Pediatric Medicine |
| Telehealth | Offers telehealth |
Hospital affiliations
- Banner Baywood Medical CenterMesa, AZ
- Banner Desert Medical CenterMesa, AZ
- Banner Gateway Medical CenterGilbert, AZ
- Banner Heart HospitalMesa, AZ
- Mercy Gilbert Medical CenterGilbert, AZ
Other facilities
- Banner Home Care-ArizonaHome health agency · Mesa, AZ
- Sunrise Health ServicesHome health agency · Mesa, AZ
- Advisacare Hospice, LLCHospice · Gilbert, AZ
- Endeavor HospiceHospice · Mesa, AZ
Industry payments (Open Payments)
- 2025$41.08 · 2 payments from 2 companies
- 2024$168.26 · 3 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astellas Pharma US Inc | $21.10 | 1 |
| Abbott Laboratories | $19.98 | 1 |
What the 2025 payments were for
- Food and Beverage$21.10 · 1 payment
- Long term medical supply or device loan$19.98 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 259 internal medicine physicians in Mesa · All internal medicine physicians in Arizona