Chakrapani Ranganathan, MD
Neurology · Warren, MINPI 1194709584
Payments from drug & device makers
What this record shows
This record is dominated by travel and lodging: $1,117 of the $1,841 with a category attached, or 60.7%. 6 manufacturers reported payments, led by Inspire Medical Systems, Inc. at 41.2% of the total. Reporting peaked in 2023 at $758 and has fallen 97.7% since, to $17 in 2025.
Across 18 payments — averaging $102.28 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Inspire Medical Systems, Inc.$758
- Livanova USA, Inc.$556
- Jazz Pharmaceuticals Inc.$265
- Medtronic$227
- Apria Healthcare LLC$18
- Lilly USA, LLC$17
What the payments were for
- Travel & lodging$1,11761%
- Food & beverage$72439%
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 |
|---|---|---|
| Inspire Medical Systems, Inc. | 6 | $758 |
| Livanova USA, Inc. | 3 | $556 |
| Jazz Pharmaceuticals Inc. | 2 | $265 |
| Medtronic | 5 | $227 |
| Apria Healthcare LLC | 1 | $18 |
| Lilly USA, LLC | 1 | $17 |
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.
- Inspire$685
- VNS Therapy$556
- XYWAV$265
How this compares
$1,841 in reported general payments places this provider in the 55th percentile of 652 neurology providers in Michigan.
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 |
|---|---|---|
| Aimovig AutoinjectorErenumab-Aooe | 18 | $14,068 |
| DilantinPhenytoin Sodium Extended | 13 | $7,268 |
| Divalproex Sodium ErDivalproex Sodium | 86 | $5,962 |
| Carbamazepine ErCarbamazepine | 19 | $5,326 |
| Carbidopa-LevodopaCarbidopa/Levodopa | 130 | $3,963 |
| Divalproex Sodium | 79 | $3,474 |
| Levetiracetam | 104 | $2,845 |
| Rivastigmine | 15 | $2,812 |
| Primidone | 79 | $2,534 |
| Pyridostigmine Bromide | 15 | $2,438 |
| Memantine Hcl | 70 | $2,363 |
| Gabapentin | 124 | $2,070 |
| Donepezil Hcl | 161 | $2,008 |
| Phenytoin Sodium Extended | 35 | $1,887 |
| ClopidogrelClopidogrel Bisulfate | 82 | $1,747 |
Paid to pharmacies, not to this prescriber.
Other neurology in Warren
- Aaron EllenbogenFarmington Hills$1.6M
- Matthew HoltzmanWayne$1.4M
- Richard TroschFarmington Hills$1.2M
- Wade CooperAnn Arbor$991K
- Bisena BulicaDetroit$900K
- Julie BurnhamMount Clemens$836K
- Amit MasihOkemos$785K
- Martin BelkinFarmington Hills$712K
- Robert PaceOwosso$693K
- Rosemarie WalchOwosso$563K
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.