ICD-10-CM > H00-H59 > H15-H22 > H18 > H18.6 > H18.62 H18.62 Keratoconus, unstable Non-Billable/Non-Specific Applicable To Acute hydrops Codes H18.621Keratoconus, unstable, right eyeH18.622Keratoconus, unstable, left eyeH18.623Keratoconus, unstable, bilateralH18.629Keratoconus, unstable, unspecified eye