2021 ICD-10-CM Codes for Nystagmus and other irregular eye movements (H55)

Clinical Terms for Nystagmus and other irregular eye movements (H55)

Nystagmus, Pathologic-. Involuntary movements of the eye that are divided into two types, jerk and pendular. Jerk nystagmus has a slow phase in one direction followed by a corrective fast phase in the opposite direction, and is usually caused by central or peripheral vestibular dysfunction. Pendular nystagmus features oscillations that are of equal velocity in both directions and this condition is often associated with visual loss early in life.

Nystagmus, Physiologic-. Involuntary rhythmical movements of the eyes in the normal person. These can be naturally occurring as in end-position (end-point, end-stage, or deviational) nystagmus or induced by the optokinetic drum (NYSTAGMUS, OPTOKINETIC), caloric test, or a rotating chair.

Nystagmus, Optokinetic-. Normal nystagmus produced by looking at objects moving across the field of vision.

Nystagmus, Congenital-. Nystagmus present at birth or caused by lesions sustained in utero or at the time of birth. It is usually pendular, and is associated with ALBINISM and conditions characterized by early loss of central vision. Inheritance patterns may be X-linked, autosomal dominant, or recessive.