The article “Denials to Dollars: Revisiting Guidelines for Perinatal Conditions” (page 1) points out the Includes note at the beginning of Chapter 16 of the tabular list is a convention of the code set and, thus, an official rule for reporting diagnoses with International Classification of Diseases, 10th Revision, Clinical Modification (ICD-10-CM). Other key conventions that help guide correct coding of conditions originating in the neonatal period are reviewed in this article. Attention to these conventions is important to correct reporting of all conditions.

In the alphabetic index and tabular list, nonessential modifiers are presented in parentheses. Nonessential modifiers are terms that may appear in the documentation of a diagnosis but do not affect code selection.

Examples: Newborn (infant) (liveborn) (singleton) Z38.2

Nonessential modifiers provide guidance but are not required for code selection. The following note at the beginning of code block P00–P04 provides further explanation of the...

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