The CPT Manual defines modifier 59 as follows: “Distinct Procedural Service: Under certain circumstances, it may be necessary to indicate that a procedure or service was distinct or independent from other non-E/M services performed on the same day. Modifier 59 is used to identify procedures/services, other than E/M services, that are not normally reported together, but are appropriate under the circumstances.” Plainly stated, modifier 59 is used to bill procedures performed on the same date of service that represent a:
- different session or patient encounter
- different procedure or surgery
- different site or organ system
- separate incision/excision or lesion
- separate injury (or area of surgery in extensive injuries
Physicians should only use modifier 59 when there is not another more descriptive modifier available. You generally append modifier 59 to the lesser service(s) but the designation of which code of a code-pair is assigned the modifier is defined by the National Correct Coding Edits (NCCI). There has been some controversy over proper use of the 59 modifier, and otolaryngology offices have had trouble determining when it is appropriate to use the 59 modifier. Providers should be aware there is also careful “monitoring” of the use of this modifier by private insurance carriers and the Centers for Medicare and Medicaid Services (CMS).
When filing claims with the 59 modifier, be sure your documentation supports its usage as a separate and distinct procedure. Remember, modifier 59 is not intended to report procedures that took extra time or were performed to facilitate or provide access to a primary procedure that was done. If you’ve met all of the above requirements, modifier 59 can be used to differentiate services.
Revised October 2023
Published July, 2006