Keratoconus, unstable, right eye

This code signifies an unstable form of keratoconus affecting the right eye. Keratoconus is a progressive corneal ectasia characterized by corneal thinning and a conical protrusion, leading to irregular astigmatism and impaired vision. "Unstable" indicates ongoing progression of the condition, such as increasing corneal steepening or thinning.

Apply this code when documentation specifies keratoconus in the right eye with evidence of progression or instability. This includes scenarios where serial topography or pachymetry shows worsening of the corneal shape or thickness. It is appropriate for patients undergoing monitoring for progression or considering interventions for stabilization, such as corneal collagen cross-linking.

• Ensure documentation explicitly states "unstable" or provides clinical evidence of progression for the right eye.
• Distinguish from stable keratoconus (H18.60-H18.61-) and other corneal ectasias.
• Always specify laterality (right, left, bilateral, or unspecified) as per the ICD-10-CM guidelines.