Ravi Mallavarpu, MD
Nephrology · Durham, NCNPI 1619157310
Payments from drug & device makers
What this record shows
Almost everything reported here is food and beverage — 100.0% of the total across 20 separate payments, which is the pattern of a clinician who attends manufacturer presentations rather than one with a consulting arrangement. 11 manufacturers reported payments, led by Calliditas Therapeutics US Inc. at 24.4% of the total. Reporting peaked in 2022 at $492 and has fallen 69.8% since, to $148 in 2024. That places this record below the midpoint for nephrology clinicians in NC, where the typical reported total is $1,119.
Across 20 payments — averaging $42.60 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Calliditas Therapeutics US Inc.$208
- Fresenius USA Marketing, Inc.$165
- Vifor Pharma, Inc.$145
- Veloxis Pharmaceuticals, Inc.$115
- AstraZeneca$70
- Takeda Pharmaceuticals U.S.A., Inc.$45
- plus $105 from 5 others
Across 50 payments — averaging $11,012 each. Payments tied to a research study. These frequently flow through the physician to a hospital or research institution rather than to the physician personally.
- Nobelpharma America, LLC$551K
What the payments were for
- Food & beverage$852100%
Most of this is food and beverage — typically meals provided during product presentations at a clinic or hospital. Nationally that is the single largest category of reported payments by count.
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 |
|---|---|---|
| Calliditas Therapeutics US Inc. | 2 | $208 |
| Fresenius USA Marketing, Inc. | 3 | $165 |
| Vifor Pharma, Inc. | 2 | $145 |
| Veloxis Pharmaceuticals, Inc. | 2 | $115 |
| AstraZeneca(2 entities) | 4 | $70 |
| Takeda Pharmaceuticals U.S.A., Inc. | 2 | $45 |
| Amgen | 1 | $29 |
| Merck | 1 | $25 |
| Renalytix AI, Inc. | 1 | $20 |
| Bayer | 1 | $17 |
| AbbVie | 1 | $13 |
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.
How this compares
$852 in reported general payments places this provider in the 40th percentile of 366 nephrology providers in North Carolina.
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 |
|---|---|---|
| Valganciclovir Hcl | 105 | $25,314 |
| OzempicSemaglutide | 20 | $18,017 |
| Atovaquone | 25 | $12,920 |
| Tacrolimus | 53 | $7,835 |
| Mycophenolate Mofetil | 21 | $3,582 |
| Lantus SolostarInsulin Glargine,hum.Rec.Anlog | 35 | $2,577 |
| Cinacalcet Hcl | 20 | $1,686 |
| Novolog FlexpenInsulin Aspart | 12 | $1,634 |
| Mycophenolic AcidMycophenolate Sodium | 19 | $1,463 |
| Humalog Kwikpen U-100Insulin Lispro | 12 | $832 |
| Carvedilol | 100 | $816 |
| Pantoprazole Sodium | 126 | $659 |
| Prednisone | 87 | $457 |
| Methenamine Hippurate | 16 | $421 |
| Nifedipine ErNifedipine | 26 | $408 |
Paid to pharmacies, not to this prescriber.
Other nephrology in Durham
- Matthew EllisDurham$51K
- John MiddletonDurham$31K
- Patrick PunDurham$30K
- John MusgroveDurham$9K
- Amarnath KathresalDurham$7K
- Nora FranceschiniDurham$7K
- Daniel EdmonstonDurham$6K
- Gregory GreenwoodWinston-Salem$947K
- Michael EtomiCharlotte$212K
- William KendrickGreenville$125K
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.