ICD-10-CM > O00-O9A > O30-O48 > O36 > O36.8 > O36.81 > O36.812 O36.812 Decreased fetal movements, second trimester Non-Billable/Non-Specific Codes O36.8120..., not applicable or unspecifiedO36.8121..., fetus 1O36.8122..., fetus 2O36.8123..., fetus 3O36.8124..., fetus 4O36.8125..., fetus 5O36.8129..., other fetus