Coding · Definition
Modifier 59: Definition
Signals that two procedures normally bundled together were genuinely distinct — different session, site or lesion.
This is a short definition only. The full explanation lives on modifier 59 and the X-series, which is the page to read if you are dealing with this on live claims.
Definition
Also known as: Distinct procedural service (and the X{EPSU} subsets)
Dermatology uses it constantly because multiple lesions are treated in one visit.
A biopsy of a lesion on the back and a destruction of a separate lesion on the forearm are distinct services even though the code pair carries an edit.
For worked examples, payer rules and documentation requirements, read modifier 59 and the X-series. Return to the dermatology billing glossary.
See this term in your own numbers
A free claims audit reviews a de-identified sample of your dermatology claims and returns a line-item findings report.