International Classification of Diseases, 10th Revision, Clinical Modification (ICD-10-CM) is more specific than its predecessor, International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM).

Physicians will find this to be true when reporting care to a patient who was born light and/or small for gestational age. In ICD-9-CM, the alphabetic index entries for the terms light and small each direct the user to codes in category 764. There is no differentiation between light, small, or small and light for gestational age. ICD-10-CM provides for more specific reporting.

The codes in ICD-10-CM may be confusing to some clinicians. In the United States, many clinicians use the term small for gestational age for all neonates below the 10th (or fifth) percentile for gestational age and then subcategorize as symmetric when weight, length, and head circumference are all below the 10th percentile and asymmetric when only the weight is...

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