Ransomware victim disclosure
← All victimsUnited Medical Doctors
Claimed by insomnia · listed 1 month ago
Status timeline
- Listed
Apr 9, 2026
- Data leaked
At a glance
- Group
- insomnia
- Status
- Data leaked
- Country
- US
- Sector
- Healthcare
- Listed on leak site
- Apr 9, 2026
About the victim
AI dossier — public-source company profileUnited Medical Doctors (UMD) is an independent multi-specialty medical and surgical group operating 80+ locations across four Southern California counties (Riverside, Orange, San Diego, and Los Angeles). The group offers 50+ specialties, 250+ providers, ambulatory surgery centers, clinical research facilities, and its own nursing college. It is described as one of the largest integrated private practices in California.
- Industry
- Multi-Specialty Outpatient Medical & Surgical Group
- Address
- Murrieta, California, USA
- Employees
- 201-500
Attack summary
Severity: critical — UMD is a large multi-specialty healthcare provider with 250+ providers and 80+ locations serving a broad patient population; a data_published status implies confirmed exfiltration and public release of data likely containing protected health information (PHI) and PII at scale, which constitutes regulated sensitive medical data under HIPAA.The Insomnia ransomware group listed United Medical Doctors with a disclosed status of data_published, indicating exfiltration and/or publication of company data. No ransom amount or specific data size was stated in the post.
Data the group says was taken
AI dossier — extracted from the leak post- Patient medical records
- Clinical research data
- Provider and staff information
- Insurance and billing records
- Surgical and outpatient care records
- Administrative and operational data
What the group claims
United Medical Doctors (UMD) is an independent multi‑specialty medical‑surgical group with 70+ Southern California locations and 40+ specialties. They focus on high‑quality, compassionate care, patient satisfaction, process improvement, outpatient surgery, clinical research.
The leak post
captured from the group's siteInsomnia Human Verification What is 1 + 1 = ? Submit Nephrology Associates Hospitals & Physicians Clinics Nephrology Associates, PA is a leading central Arkansas nephrology practice with seven highly trained physicians across seven locations. They provide compassionate kidney care, accept all insurances, and aim to create a welcoming environment for patients. Website: www.arnapa.com Revenue: $5 million Employees: 11-50 Location: Little Rock, Arkansas, USA Notified: 2026-4-6 METO Systems Industrial Machinery & Equipment METO Systems designs and manufactures stainless-steel industrial material‑handling equipment for regulated industries. Products include lifts, blenders, transporters, and docking systems, they offer installation, training, customization, and support. Website: www.metosystems.com Revenue: $6 million Employees: 11-50 Location: Parsippany, New Jersey, USA Notified: 2026-3-31 United Medical Doctors Hospitals & Physicians Clinics United Medical Doctors (UMD) is an independent multi‑specialty medical‑surgical group with 70+ Southern California locations and 40+ specialties. They focus on high‑quality, compassionate care, patient satisfaction, process improvemen…
Screenshot of the leak post

Sources
Source
Indexed 1 month agoThis page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.
