-- H18.20 Unspecified corneal edema

-- H18.21 Corneal edema secondary to contact lens

--- H18.211 Corneal edema secondary to contact lens, right eye

--- H18.212 Corneal edema secondary to contact lens, left eye

--- H18.213 Corneal edema secondary to contact lens, bilateral

--- H18.219 Corneal edema secondary to contact lens, unspecified eye

-- H18.22 Idiopathic corneal edema

--- H18.221 Idiopathic corneal edema, right eye

--- H18.222 Idiopathic corneal edema, left eye

--- H18.223 Idiopathic corneal edema, bilateral

--- H18.229 Idiopathic corneal edema, unspecified eye

-- H18.23 Secondary corneal edema

--- H18.231 Secondary corneal edema, right eye

--- H18.232 Secondary corneal edema, left eye

--- H18.233 Secondary corneal edema, bilateral

--- H18.239 Secondary corneal edema, unspecified eye