Data Element

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Gestational Age

"The estimated gestational age (in weeks, or weeks and fraction of week) of the pregnancy at the time of the health care encounter (in contrast to the gestational age at birth), beginning from the time of fertilization. Needs to be correlated with the date the gestational age was documented.
Gestational age (written with both weeks and days) is calculated using the best obstetrical estimated delivery date (EDD) based on the following formula: Gestational Age = (280 - (EDD - Reference Date))/ 7"


Standards specified are insufficient. ICD-10-CM Z3A.X and others

ICD-10-CM Z3A and children codes represent weeks gestation of a pregnancy episode.  Specific gestational age is fundamental in each pregnancy episode's encounters up until delivery. Having gestational age represented in the patient's diagnosis or problem list represented by specific ICD-10-CM Z3A codes or SNOMED-CT specific codes will assist OBGYN physicians and CDSS algorithms to use and recommend proper follow-ups, referrals and administration of screening tools (depression, gestational diabetes, preeclampsia/eclampsia, etc.).

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