Summary: This report focuses on the debt collection processes and procedures used by the Department of Health and Human Services' (HHS) Centers for Medicare and Medicaid Services (CMS). The primary reason for the growth of CMS' civil monetary penalties (CMP) receivables was the expansion of fraud and abuse detection activities from fiscal year 1995 through fiscal year 1997 that significantly increased reported fraud and abuse debts in fiscal year 1997. GAO's analysis of CMS' CMP receivable data revealed similar financial accountability and reporting issues as those identified for non-CMP receivables by CMS' external financial statement auditors. GAO identified (1) unreconciled differences of tens of millions of dollars in the CMP receivables balances reported by HHS and CMS for fiscal years 1997 through 1999 and (2) an unreconciled net difference of about $22 million between the CMP receivables balance in CMS' general ledger and the detailed subsidiary systems as of September 30, 2000. The data reliability issue prevented GAO from determining the overall adequacy of the CMP debt collection policies and procedures. However, GAO's limited tests showed that debt collection policies and procedures were followed for 11 of the 12 selected delinquent debts. GAO could not determine whether debt collection policies and procedures were followed for the 12th selected debt because supporting documentation was unavailable.