Arcus senilis, unspecified eye

This code describes arcus senilis, a benign, age-related corneal degeneration characterized by a white, gray, or bluish opaque ring in the peripheral cornea. It is caused by lipid deposits in the corneal stroma and is typically bilateral, though it can present unilaterally.

Use this code when documentation indicates arcus senilis without specifying laterality (e.g., "arcus senilis noted"). This code is appropriate when the provider does not specify which eye is affected, or if the condition is present in both eyes but only "arcus senilis" is documented without further detail.

• Avoid using this code if laterality is specified; instead, use H18.411 (right eye) or H18.412 (left eye).
• Do not confuse with other corneal opacities or degenerations that may require different coding.
• Ensure the documentation clearly states "arcus senilis" to support this diagnosis.