ICD-10-CM > O00-O9A > O30-O48 > O36 > O36.8 > O36.81 > O36.819 O36.819 Decreased fetal movements, unspecified trimester Non-Billable/Non-Specific Codes O36.8190..., not applicable or unspecifiedO36.8191..., fetus 1O36.8192..., fetus 2O36.8193..., fetus 3O36.8194..., fetus 4O36.8195..., fetus 5O36.8199..., other fetus