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Diagnosis Coding:
Using the ICD-10-CM

Coding Conventions

Abbreviations

Alphabetic Index

  • NEC (Not Elsewhere Classifiable): Represents “other specified”. When a specific code isn't available for a condition, the Alphabetic Index directs you to the other specified code in the Tabular List. When a specific code isn't available for a condition, the Tabular List includes an NEC entry under a code to identify it as the other specified code.
  • NOS (Not Otherwise Specified): Is the equivalent of unspecified.

Tabular List

  • NEC (Not Elsewhere Classifiable): Represents “other specified”. When a specific code isn't available for a condition, the Tabular List includes an NEC entry under a code to identify the code as the other specified code.
  • NOS (Not Otherwise Specified): Is the equivalent of unspecified.