Citibank utilizes a variety of third-party collection agencies and legal networks depending on the specific delinquency stage, type of debt, and geographic jurisdiction of the account. When credit card or loan accounts fall severely behind on payments, Citibank may assign or sell the accounts to external collection agencies or specialized debt buyers. Prominent collection firms and law practices handle these recovered portfolios on behalf of the bank, communicating directly with debtors to negotiate settlements, repayment plans, or legal resolutions under federal debt collection guidelines.