2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Certain Conditions Originating In The Perinatal Period 760-779 > Other Conditions Originating In The Perinatal Period 764-779 > ICD-9-CM Diagnosis 766 Disorders relating to long gestation and high birthweight 766 is a non-specific code that cannot be used to specify a diagnosis ICD-9-CM Diagnosis 766.0 Exceptionally large baby relating to long gestation 766.0 is a specific code that can be used to specify a diagnosis 766.0 contains 7 index entries ICD-9-CM Diagnosis 766.1 Other 'heavy-for-dates' infants not related to gestation period 766.1 is a specific code that can be used to specify a diagnosis 766.1 contains 3 index entries ICD-9-CM Diagnosis 766.2 Post-term infant not 'heavy-for-dates' 766.2 is a non-specific code that cannot be used to specify a diagnosis ICD-9-CM Diagnosis 766.21 Post-term infant An infant born at or after 42 weeks of gestation. 766.21 is a specific code that can be used to specify a diagnosis 766.21 contains 4 index entries ICD-9-CM Diagnosis 766.22 Prolonged gestation of infant 766.22 is a specific code that can be used to specify a diagnosis 766.22 contains 14 index entries