Michael Grantham, MD
Diagnostic Radiology · Mishawaka, INNPI 1649264342
Payments from drug & device makers
What this record shows
This record is dominated by travel and lodging: $4,324 of the $5,622 with a category attached, or 76.9%. GE HealthCare accounts for 64.1% of it on its own, with 3 other manufacturers making up the rest. Reporting peaked in 2023 at $2,327 and has fallen 99.1% since, to $21 in 2025. Among diagnostic radiology clinicians in IN with any reported payments, this total sits in the top 10% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 44 payments — averaging $127.78 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- GE HealthCare$4K
- Siemens Medical Solutions USA, Inc.$2K
- Heartflow, Inc.$86
- Baxter Healthcare$15
What the payments were for
- Travel & lodging$4,32477%
- Food & beverage$1,29823%
General payments by program year
Who reported the general payments
Companies are grouped under their corporate parent — a single manufacturer often files under several CMS reporting entities. Research and ownership payments are counted separately and are not in this table.
| Company | Payments | Total |
|---|---|---|
| GE HealthCare | 22 | $3,604 |
| Siemens Medical Solutions USA, Inc. | 20 | $1,917 |
| Heartflow, Inc. | 1 | $86 |
| Baxter Healthcare | 1 | $15 |
What the payments were tied to
Products named in the reported payments. Only payments of $100 or more are attributed here — the typical reported payment nationally is a meal worth about $16, and listing those product-by-product would be noise.
- REVOLUTION$1,353
- MAGNETOM Altea$665
- MAGNETOM Lumina$459
- SOMATOM Force$157
- SOMATOM go.Top$136
- SOMATOM On.site$118
How this compares
$5,622 in reported general payments places this provider in the 90th percentile of 596 diagnostic radiology providers in Indiana.
Medicare billing
What this is not: this is the amount Original Medicare Part B allowed for services this provider billed in 2024. It is not their income. It excludes Medicare Advantage — now more than half of all Medicare enrollment — along with Medicaid and all commercial insurance, and it is gross practice revenue before staff, rent, supplies and malpractice premiums. CMS also suppresses any figure covering ten or fewer patients, so low-volume providers appear smaller than they are.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| Methylprednisolone | 25 | $148 |
Paid to pharmacies, not to this prescriber.
Other diagnostic radiology in Mishawaka
- Samir PatelMishawaka$16K
- Albert ChoMishawaka$2K
- Jonathan WeissMishawaka$2K
- Vincent FlandersCarmel$463K
- Raja RamaswamyIndianapolis$447K
- Shawn TeagueIndianapolis$195K
- Fatih AkisikIndianapolis$191K
- Krishna AmuluruCarmel$92K
- Joshua DowellIndianapolis$85K
- Derek ZipkinIndianapolis$65K
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Billing: Medicare Physician & Other Practitioners, data year 2024. Original Medicare Part B only.
- Identity: NPPES NPI Registry, July 2026.