Beau's lines

This code represents Beau's lines, which are deep, transverse grooves or indentations that appear across the fingernails or toenails. These lines typically indicate a temporary cessation or slowing of nail growth due to a systemic illness, trauma, or nutritional deficiency. The depth and location of the lines can provide clues about the timing and severity of the underlying event.

Use this code when documentation explicitly states the presence of Beau's lines on the patient's nails. This condition is often observed during a physical examination or reported by the patient. Supporting documentation should describe the appearance of the lines and may include an associated underlying systemic condition.

• Do not confuse Beau's lines with other nail dystrophies like onychorrhexis or onycholysis; ensure the documentation specifically identifies transverse grooves.
• Always code any underlying systemic condition, trauma, or nutritional deficiency that caused the Beau's lines as a primary diagnosis, with Beau's lines as a secondary diagnosis.
• If the cause of Beau's lines is unknown or not documented, this code can be used as a standalone diagnosis.