Appendix A: ICD-9 Codes for Complications

The maintenance of the ICD-9 is the responsibility of the NCHS (National Center for Health Statistics). The ICD-9 manual contains symbols, abbreviations, punctuation and notations called . conventions . which are usually found in the front of the book. NEC (Not elsewhere classifiable) – used only in Volume 1, the tabular list, and is to be ... ................
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