Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier that only part of the service was performed. Use when a provider electively performs fewer elements of a procedure (for example fewer radiographic views or a unilateral portion of an inherently bilateral procedure when no unilateral code exists). It is not appropriate when another CPT code more accurately describes the service, nor for evaluation and management codes, and it should not be used for procedures stopped for patient safety or after anesthesia induction (those situations use Modifier ‑53 or facility modifiers such as ‑73/‑74). Documentation should clearly explain why the service was reduced and which portions were omitted.

On claims, providers should reflect the reduced work by submitting either a reduced charge or the same CPT code with Modifier ‑52 appended. Medicare/Medicaid and many commercial payers apply a payment reduction when Modifier ‑52 is reported — CMS guidance and typical payer policies commonly reduce payment to about 50% for non‑anesthesia procedures, and reimbursement is generally the lower of the reduced billed charge or the fee schedule allowance. Because commercial payer policies vary, always verify individual payer rules and required documentation before billing.

Real‑world examples include performing fewer radiographic views than the full study (e.g., reporting 71046‑52 if only one view was performed) and performing a unilateral portion of an inherently bilateral surgical procedure when no unilateral CPT exists (append Modifier ‑52 and document unilateral performance). Remember that Modifier ‑52 is intended to describe elective reductions in service by the provider; if the procedure was discontinued for safety reasons or after anesthesia, use the appropriate discontinued or facility modifier instead.