Oligohydramnios, unspecified trimester, fetus 3

This code signifies an abnormally low volume of amniotic fluid surrounding the fetus, where the specific gestational trimester is not documented. It indicates a potential risk to fetal well-being due to reduced cushioning, umbilical cord compression, or impaired lung development. This particular code specifies that it applies to the third fetus in a multiple gestation pregnancy.

Use this code when documentation clearly states oligohydramnios but does not specify the trimester of diagnosis, and the patient is carrying triplets or more, with this diagnosis pertaining to the third fetus. This code is appropriate when the physician's notes indicate a low amniotic fluid index (AFI) or deepest vertical pocket (DVP) measurement without a specified trimester.

• Ensure documentation explicitly identifies the affected fetus as the "third fetus" in a multiple gestation.
• If the trimester is known, a more specific code from the O41.01-O41.03 series should be used.
• Always sequence this code after the primary obstetric code indicating the pregnancy.