Encounter for antenatal screening for uncertain dates

This code signifies a prenatal visit where the primary purpose is to establish or refine the estimated date of delivery (EDD) due to discrepancies or uncertainties in the patient's reported last menstrual period (LMP) or other initial dating methods. It indicates that further antenatal screening, such as ultrasound, is being performed to accurately determine gestational age.

Use this code when a pregnant patient presents for an antenatal visit specifically because her gestational age is unclear, and the provider needs to perform additional assessments (e.g., ultrasound) to confirm or adjust the EDD. This often occurs when the LMP is unknown, irregular, or inconsistent with early clinical findings.

• Do not use this code for routine dating ultrasounds when the LMP is certain.
• Code any definitive findings or complications identified during the screening separately.
• This code is typically a primary diagnosis for the encounter focused on dating uncertainty.