CPT Modifier 52: Reduced or Discontinued Pathology Procedure

Modifier 52 (Reduced Services) indicates a procedure was partially reduced or eliminated at the physician's discretion.

Pathology-Specific Context

• Specimen inadequate (e.g., biopsy core fragmented, insufficient tissue for diagnosis).
• Procedure started but aborted (patient instability, technical failure).
• Only component of a panel performed (e.g., frozen section only, no permanent sections).

Documentation & Billing

• Operative/pathology report must explain why service was reduced.
• Reimbursement typically reduced (often 50% of allowable, payer-specific).
• Do not use for patient non-compliance (e.g., no-show) — that's a billing/coding decision, not modifier 52.

Contrast

• Modifier 53 = Discontinued after anesthesia induction (surgical).
• Modifier 52 = Reduced by choice before completion (no anesthesia requirement).