New Scheimpflug imaging-based devices have shown the importance and usefulness of the pachymetric map for an appropriate diagnosis of PMD. Corneal topographic indices and the classical crab-claw topographic pattern cannot be used as the main tool to distinguish between PMD and keratoconus. Schalaeppi first coined the term pellucid marginal degeneration in 1957.
The cornea in and adjacent to the thinned area is ectatic. H18.609 Keratoconus, unspecified, unspecified eye H18.609 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Pellucid marginal degeneration (PMD) is a bilateral, noninflammatory, peripheral corneal thinning disorder characterized by a peripheral band of thinning of the inferior cornea. Slit-lamp examination is very useful to distinguish PMD from other corneal ectatic disorders with inflammatory nature. Pellucid marginal corneal degeneration (PMD) is a rare ectatic disorder which typically affects the inferior peripheral cornea in a crescentic fashion. PMD usually starts later in life than keratoconus and progresses slower than keratoconus.
It is a rare corneal disorder that shares many clinical characteristics with other corneal ectasias, such as keratoconus, keratoglobus or Terrien marginal degeneration. Pellucid marginal degeneration (PMD) is a non-inflammatory ectatic corneal disease characterized by a narrow band of corneal thinning separated from the limbus by a relatively uninvolved area 1-2 mm in width.
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