20 weeks gestation of pregnancy

This code indicates that a pregnant patient has reached precisely 20 weeks of gestation. It is used to specify the exact gestational age of the fetus at a particular point in time during the pregnancy.

This code is appropriate for documenting the gestational age when a patient is exactly 20 weeks pregnant, often identified during routine prenatal visits, ultrasound examinations, or when establishing the estimated date of delivery. It is frequently used in conjunction with codes for the pregnancy itself (e.g., O codes).

• Always sequence this code after the primary obstetric code (e.g., O09.-, O80, O82).
• Ensure the documentation clearly states "20 weeks gestation" to support this specific code.
• Do not use this code if the gestational age is estimated or falls between weeks; use the appropriate code for the documented week.