Modifier code
Modifier 50: Bilateral procedure
Procedure performed on both sides of the body during a single session.
Code
50
When to use
Bilateral procedure — e.g., bilateral tympanoplasty, bilateral knee injection.
Common issues
- Denied if procedure isn't on the bilateral-eligible list per Medicare LCD
Frequently asked questions
What is modifier 50?
Bilateral procedure
When should it be used?
Bilateral procedure — e.g., bilateral tympanoplasty, bilateral knee injection.
Common issues when modifier is missing or wrong?
Denied if procedure isn't on the bilateral-eligible list per Medicare LCD.
Other modifiers
- 25 — Significant, separately identifiable E&M service on same day as procedureWhen E&M visit + procedure happen same day and the E&M was separately documented
- 26 — Professional componentSplits a procedure into its professional (physician interpretation) and technica
- 51 — Multiple proceduresMultiple procedures performed at the same session.
- 52 — Reduced servicesService partially reduced or eliminated at the physician's discretion.
- 53 — Discontinued procedureProcedure discontinued because of extenuating circumstances.
- 57 — Decision for surgeryE&M visit at which decision for major surgery was made.
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