Michael Mackenzie Johnson, M.D.
NPI 1609869643ActiveIndividual· Internal Medicine· Sun City, AZ
Internal Medicine (M.D.) in Sun City, Arizona, trained at University of Arizona College of Medicine (class of 1983). Their prescriptions cost Medicare Part D more than their services did: $985,551 for 12,281 claims, against $145,747 paid for services in 2024. Sumitomo Pharma America, Inc. was the largest of 20 companies reporting payments in 2025, $1,856 in all, mostly food and beverage.
Overview
| NPI | 1609869643 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Aug 24, 2005 |
| Last updated in NPPES | Sep 9, 2016 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 12960 | 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 | 411 |
|---|---|
| Services billed | 2,258 across 39 procedure codes |
| Paid by Medicare | $145,747 |
Part D prescriptions in 2024
| Prescriptions (claims) | 12,281 · 33,822 30-day fills |
|---|---|
| Patients | 1,100 |
| Total drug cost | $985,551 |
| Generic share | 90% of claims |
Education and affiliations
| Medical school | University of Arizona College of Medicine |
|---|---|
| Graduation year | 1983 |
| Medicare specialty | Internal Medicine |
Medical group
- Maxwell GroupSun City, AZ · 10 clinicians
Hospital affiliations
- Banner del E. Webb Medical CenterSun City West, AZ
- Banner Thunderbird Medical CenterGlendale, AZ
Other facilities
- Banner Home Care-ArizonaHome health agency · Mesa, AZ
- Summit Home Health LLCHome health agency · Phoenix, AZ
Industry payments (Open Payments)
- 2025$1,856 · 90 payments from 20 companies
- 2024$1,119 · 60 payments from 23 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Sumitomo Pharma America, Inc. | $321.17 | 12 |
| Abbott Laboratories | $245.95 | 9 |
| Astrazeneca Pharmaceuticals LP | $208.61 | 14 |
| Lilly USA, LLC | $175.76 | 12 |
| Astellas Pharma US Inc | $134.09 | 5 |
What the 2025 payments were for
- Food and Beverage$1,856 · 90 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 77 internal medicine physicians in Sun City · All internal medicine physicians in Arizona