AngMar Management Services data breach: a Texas healthcare manager, and patients who never heard of it

Why did I get a letter from AngMar?

AngMar is not a provider that patients visit. The letter says it received the information in the normal course of business, in connection with the management services it provides. It does not name the practices or providers it manages, so the letter may be the first time a reader has seen the name. The guide to breach letters from companies you never dealt with covers letters like this one, and the guide to vendor breach notices shows how such letters are put together.

What happened at AngMar?

AngMar says it secured its systems, opened an investigation and brought in a third-party team of forensic investigators. It then reviewed the affected data to work out whom it concerned.

Date	What the letter and the regulators' records say
On or around July 18, 2026	Information may have been accessed or acquired
July 20, 2026	AngMar identifies unusual activity
September 16, 2026	Report to HHS (126,196, as a business associate)
September 22, 2026	Letter date; Indiana notice (110,256 total; 1,164 in Indiana)
September 23, 2026	Logged in Massachusetts (3 residents)

AngMar found the activity two days after the access and dated its letters about nine weeks later. The two counts differ: 126,196 at HHS and 110,256 at Indiana. Neither record explains the gap.

What information was involved?

The letter lists the reader's first and last name with: address, date of birth, Social Security number, patient ID, medical record number, health insurance information, service date, diagnosis or condition information, provider name, prescription information and medical history information. AngMar says there is no evidence that anyone's information has been or will be misused.

What is AngMar offering?

Item	Detail from the letter
Service	Single-bureau credit monitoring, credit report and credit score, for the period printed on each letter
Provider	Cyberscout, a TransUnion company
Questions	1-877-520-9311, Monday to Friday, 8:00 a.m. to 8:00 p.m. Eastern Time, excluding U.S. holidays

The guide to credit monitoring offers sets AngMar Management Services' offer beside other letters.

What Texas's attorney general recorded

Texas's attorney general lists a report from AngMar Management Services, posted on September 25, 2026, with 35,916 Texans affected, a count of Texas residents only. The record lists names, addresses, Social Security numbers, medical information, health insurance information and dates of birth as involved.

What the documents leave open

• Which providers' patients are among the 126,196.
• How the unauthorized actor got in.
• Why the HHS and Indiana totals differ.

With 126,196 people, AngMar Management Services' report is the 44th largest of the 415 open 2026 reports in the ranking of 2026 healthcare breaches reported to HHS.