A company that provides software for assisted living communities, group homes and other organizations serving elderly or disabled individuals announced on Tuesday a potential data breach that affects almost 60 facilities or companies in Massachusetts, Minnesota, Missouri and Tennessee.

The security incident, according to Tenx Systems, doing business as ResiDex Software, puts at risk the personal information and protected health information — including names, Social Security numbers and medical records — of current, former and prospective residents and staff members, the company said. A forensic investigation was unable to identify any specific individuals whose information may have been compromised “due to the complexity of the event and efforts undertaken by the perpetrators to conceal their actions,” ResiDex said.

The investigation found that the breach, involving ransomware that affected the company’s server infrastructure and took its systems offline, occurred around April 2. ResiDex said it became aware of the incident on April 9 and began notifying all those potentially affected by it on June 7.

ResiDex said that once it discovered that its systems were compromised, it was able to restore its servers to a new hosting provider on the same day, using backups and other information.

People who have been notified or who believe that they may have been affected by the incident can call (877) 347-0184 weekdays between 9 a.m. and 9 p.m. EST.

April was the worst month on record for healthcare data breaches, according to the HIPAA Journal. More data breaches were reported in April than in any other month since the Department of Health and Human Services’ Office for Civil Rights started publishing reports on such incidents in October 2009, the journal reported.

The facilities and companies that were affected by the ResiDex security breach (alphabetized by state, then facility name):

  • Wingate Healthcare, Needham, MA
  • Youville House, Cambridge, MA
  • Youville Place, Lexington, MA
  • Arlington Place, St. Joseph, MN
  • Bethesda Willmar, Willmar, MN
  • Boulder Creek, Marshall, MN
  • Boulder Estates, Marshall, MN
  • Brookstone Manor, Grand Rapids, MN
  • Brookstone Specialty Care, Grand Rapids, MN
  • Comfort Health Comfort Homes, Rochester, MN
  • Copperfield Hill, Robbinsdale, MN
  • Day Break, Willmar, MN
  • Edgewood OpCo, Blaine, MN
  • English Rose Suites, Edina, MN
  • Foxdale: A Colony Court Senior Living Solution, Waseca, MN
  • Full Circle Senior Living doing business as Diamond Willow Assisted Living, Duluth, MN
  • Full Circle Senior Living doing business as Keystone Bluffs, Duluth, MN
  • GarKat, Waseca, MN
  • Glenwood Estates, Glenwood, MN
  • Good Samaritan Society, Brainerd, MN
  • Good Shepherd Assisted Living and Good Shepherd Cottages, Sauk Rapids, MN
  • Good Shepherd Homes Inc., Sauk Rapids, MN
  • Good Shepherd Lutheran Home, Sauk Rapids, MN
  • Harding Place, Pierz, MN
  • Harmony House – Brainerd, Brainerd, MN
  • Harmony House – Motley, Motley, MN
  • Harmony House – Pierz, Pierz, MN
  • Home Front First, Montevideo, MN
  • KC Companies, Pequot Lakes, MN
  • Knute Nelson Housing, Alexandria, MN
  • Lakeview, Heron Lake, MN
  • Meadow Ponds, Pierz, MN
  • Oak Ridge Place, Stillwater, MN
  • Park View Village, Olivia, MN
  • Pelican Valley Senior Living, Pelican Rapids, MN
  • Pine View, Windom, MN
  • Prairie Rose, Granite Falls, MN
  • Prairie Senior Cottages, Albert Lea, MN
  • Presbyterian Homes and Services, Crosby, MN
  • Riverside of Pillager, Pillager, MN
  • Riverside of Royalton, Royalton, MN
  • Rosewood Specialty Care, Montevideo, MN
  • School Sisters of Notre Dame, Mankato, MN
  • Serenity Assisted Living & Memory Care, Dilworth, MN
  • Serenity Village, Avon, MN
  • Shepherd Oak Apartments, Sauk Rapids, MN
  • Shepherd Oak West Apartments, Sauk Rapids, MN
  • Shepherd of Grace LLC, Becker, MN
  • Sunrise Village, Willmar, MN
  • Valley View, Jordan, MN
  • Vermilion Senior Living, Tower, MN
  • Welcome Home Management, Hutchinson, MN
  • Wildwood, Sauk Rapids, MN
  • Twin Oaks Estate, O’Fallon, MO
  • Twin Oaks at Heritage Pointe, Wentzville, MO
  • The Courtyards Senior Living – Briarcliff, Oak Ridge, TN
  • The Courtyards Senior Living – Johnson City, Johnson City, TN
  • The Courtyards Senior Living – Knoxville, Knoxville, TN
  • The Courtyards Senior Living – Knoxville Gardens, Knoxville, TN