ICD-10-CM > O00-O9A > O30-O48 > O36 > O36.8 > O36.81 O36.81 Decreased fetal movements Non-Billable/Non-Specific Codes O36.812Decreased fetal movements, second trimesterO36.8120..., not applicable or unspecifiedO36.8121..., fetus 1O36.8122..., fetus 2O36.8123..., fetus 3O36.8124..., fetus 4O36.8125..., fetus 5O36.8129..., other fetusO36.813Decreased fetal movements, third trimesterO36.8130..., not applicable or unspecifiedO36.8131..., fetus 1O36.8132..., fetus 2O36.8133..., fetus 3O36.8134..., fetus 4O36.8135..., fetus 5O36.8139..., other fetusO36.819Decreased fetal movements, unspecified trimesterO36.8190..., not applicable or unspecifiedO36.8191..., fetus 1O36.8192..., fetus 2O36.8193..., fetus 3O36.8194..., fetus 4O36.8195..., fetus 5O36.8199..., other fetus