Primary cyst of pars plana, unspecified eye

This code describes a congenital or acquired fluid-filled sac located in the pars plana region of the ciliary body, which is the flattened part of the ciliary body extending from the ora serrata. These cysts are typically benign and often asymptomatic, discovered incidentally during routine ophthalmic examination.

Use this code when documentation specifies a primary cyst originating in the pars plana, and the laterality of the affected eye is not specified. This diagnosis is typically made via slit lamp examination, gonioscopy, or imaging studies such as ultrasound biomicroscopy (UBM).

• Ensure documentation clearly states "pars plana cyst" and specifies it as primary, not secondary to trauma or inflammation.
• Avoid using this code if the laterality (right or left eye) is documented; instead, select the more specific code for the affected eye.
• Do not confuse with cysts of the iris or ciliary body that are not specifically located in the pars plana.