Irregular astigmatism, bilateral

This code signifies an abnormal, non-uniform curvature of the cornea or lens in both eyes, leading to multiple focal points and distorted vision. Unlike regular astigmatism, the principal meridians are not 90 degrees apart, or the curvature varies significantly across the corneal surface. This condition often results from corneal scarring, keratoconus, or complications from eye surgery.

Use this code when documentation clearly indicates irregular astigmatism affecting both the right and left eyes. This diagnosis is typically made through corneal topography or wavefront analysis, which reveals the non-uniform corneal surface. It is appropriate for patients presenting with significant visual distortion not correctable with standard spherical or toric lenses.

• Ensure documentation specifies "irregular" astigmatism and explicitly states "bilateral" involvement.
• Differentiate from H52.211 (right eye) and H52.212 (left eye) when only one eye is affected.
• Consider co-reporting with underlying conditions such as keratoconus (H18.6x) or corneal scars (H17.x) if present and documented.