What is the difference between an index and a register?

Indexes and Registers

¦ Indexes: Are permanent topical collections of medical record data required by laws and logic to locate cases for record maintenance, statistics and research, e.g. MPI, physician, disease, procedure and surgery indexes.

¦ Registers: Are permanent chronological listings for maintaining certain statistics, e.g. surgical log, admission, inpatient, outpatient, and death registers.