CareMax, a Miami-based healthcare company that operates clinics and coordinates care for patients mostly on Medicare, filed for bankruptcy on Sunday, listing up to $500 million in assets and up to $1 billion in liabilities.

CareMax was the exclusive Medicare managed service organization to Stewardship Health. Steward’s bankruptcy posed an “existential threat” that CareMax said it couldn't overcome.

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CareMax, which operates 56 medical centers in Florida, Texas, Tennessee and New York catering largely to older patients, filed for Chapter 11 bankruptcy in Texas on Sunday. The Miami-based firm listed debts of $693 million and assets of $390 million,