The n0n ransomware group listed Arthritis Center of Riverside on its data leak site on 2026-10-24. Country: US Sector: Healthcare Claim as published on the leak site: rheumatology medical practice · Riverside, California, United States | Scanned laboratory requisitions of named patients with dates of birth, home addresses and Medicare subscriber details, April through October 2026; Accounts receivable aging with patient names, account numbers, insurers and balances; Patient billing files and records correspondence of the practice | [NOT PAID — EXPOSED]