MMMBS Data Breach Exposes Sensitive Personal and Health Information
MMMBS recently disclosed a data breach that may have compromised sensitive personal and protected health information (PHI). The company detected suspicious activity within its IT network and launched an investigation, confirming on March 27, 2025, that an unauthorized third party had accessed and acquired data.
After a months-long review, MMMBS determined on December 2, 2025, that the breach exposed a wide range of personal and medical data, including names, Social Security numbers, dates of birth, government-issued IDs, Medicare/Medicaid numbers, medical records, health insurance details, payment card numbers, and biometric data. The exact information impacted varies by individual.
MMMBS publicly announced the breach on January 2, 2026, via its website and filed an official notice with the U.S. Department of Health and Human Services’ Office for Civil Rights on January 5, 2026. Affected individuals are being provided with details on the exposed data and complimentary credit monitoring services.
Mid Michigan Medical Billing Service, Inc. cybersecurity rating report: https://www.rankiteo.com/company/mid-michigan-medical-billing-service-inc-
"id": "MID1768594115",
"linkid": "mid-michigan-medical-billing-service-inc-",
"type": "Breach",
"date": "3/2025",
"severity": "85",
"impact": "4",
"explanation": "Attack with significant impact with customers data leaks"{'affected_entities': [{'customers_affected': 'Unknown',
'industry': 'Healthcare',
'name': 'MMMBS',
'type': 'Company'}],
'customer_advisories': 'Affected individuals are being provided with details '
'on the exposed data and complimentary credit '
'monitoring services.',
'data_breach': {'data_exfiltration': 'Yes',
'personally_identifiable_information': 'Yes',
'sensitivity_of_data': 'High',
'type_of_data_compromised': ['Names',
'Social Security numbers',
'Dates of birth',
'Government-issued IDs',
'Medicare/Medicaid numbers',
'Medical records',
'Health insurance details',
'Payment card numbers',
'Biometric data']},
'date_detected': '2025-03-27',
'date_publicly_disclosed': '2026-01-02',
'description': 'MMMBS recently disclosed a data breach that may have '
'compromised sensitive personal and protected health '
'information (PHI). The company detected suspicious activity '
'within its IT network and launched an investigation, '
'confirming on March 27, 2025, that an unauthorized third '
'party had accessed and acquired data. After a months-long '
'review, MMMBS determined on December 2, 2025, that the breach '
'exposed a wide range of personal and medical data, including '
'names, Social Security numbers, dates of birth, '
'government-issued IDs, Medicare/Medicaid numbers, medical '
'records, health insurance details, payment card numbers, and '
'biometric data. The exact information impacted varies by '
'individual.',
'impact': {'data_compromised': 'Sensitive personal and protected health '
'information (PHI)',
'identity_theft_risk': 'High',
'payment_information_risk': 'High',
'systems_affected': 'IT network'},
'investigation_status': 'Completed',
'references': [{'date_accessed': '2026-01-02', 'source': 'MMMBS Website'},
{'date_accessed': '2026-01-05',
'source': 'U.S. Department of Health and Human Services’ '
'Office for Civil Rights'}],
'regulatory_compliance': {'regulations_violated': ['HIPAA'],
'regulatory_notifications': ['U.S. Department of '
'Health and Human '
'Services’ Office for '
'Civil Rights (filed '
'on 2026-01-05)']},
'response': {'communication_strategy': 'Public announcement via website and '
'regulatory filing'},
'threat_actor': 'Unauthorized third party',
'title': 'MMMBS Data Breach Exposes Sensitive Personal and Health Information',
'type': 'Data Breach'}