Symptoms and signs involving the nervous and musculoskeletal system ICD-9 781.0 Abnormal involuntary movements ICD-10 R25 Abnormal involuntary movements R25.0 Abnormal head movements R25.1 Tremor, unspecified R25.2 Cramp and spasm R25.3 Fasciculation (Twitching NOS) R25.8 Other abnormal involuntary movements R25.9 Unspecified abnormal involuntary movements