GlassScriptGastroklenz, INC. Dba Cloudcath
Reporting payments is a legal requirement; large totals often reflect large product portfolios.
$135Kgeneral payments (2019-2025)
$0.00research payments (2019-2025)
40clinicians paid
General and research payments are shown separately, never blended. Research payments are often institution-directed and tied to clinical trials.
General payments by year
General payments only, as reported to CMS. Research payments are totaled above and not included in these bars.
Specialties it works with most
Clinicians with the largest reported totals
Often long-running consulting, speaking, or advisory relationships, which companies must report by law. A large total is not evidence of anything improper.
| Clinician | Location | Specialty | General payments (2019-2025) |
|---|---|---|---|
| Don Williamson | Augusta, GA | Nephrology (Internal Medicine) | $104,045.50 |
| Jeffrey Hymes | Nashville, TN | Nephrology (Internal Medicine) | $19,431.74 |
| Leon Rovner | Los Angeles, CA | Nephrology (Internal Medicine) | $1,069.55 |
| Luani Lee | Los Angeles, CA | Nephrology (Internal Medicine) | $835.46 |
| Bruce Greenfield | Los Angeles, CA | Nephrology (Internal Medicine) | $785.46 |
| Vinh Cam | Torrance, CA | Nephrology (Internal Medicine) | $600.00 |
| Leonid Pravoverov | Stockton, CA | Nephrology (Internal Medicine) | $462.28 |
| Tarun Marwaha | Fountain Valley, CA | Nephrology (Internal Medicine) | $456.41 |
| Shaminder Gupta | Houma, LA | Nephrology (Internal Medicine) | $434.00 |
| Mark Russo | Naples, FL | Nephrology (Internal Medicine) | $400.00 |
Source: CMS Open Payments, program years 2019-2025, as reported to CMS by drug and device makers (published June 30, 2026). Drug and device detail covers 2023-2025.