Quick Facts
Status
LT
Modifier LT
Left Side
Active
Global Period
Not Applicable
Modifier
LT
Applies To
Left Side Procedures and Services
Category
Use With
Anatomical
CPT & HCPCS Codes
What is Modifier LT?
Modifier LT indicates that a procedure, service, or item was performed on the left side of the patient's body. It helps identify the correct anatomical location for billing, claims processing, and medical record documentation.
Modifier LT should only be reported when the CPT or HCPCS code allows laterality and payer guidelines require identification of the left side.
When to Use
A procedure is performed on the left side of the body.
A medical device or durable medical equipment is provided for the left side.
Laterality is required by the payer.
The CPT or HCPCS code does not already specify the left side.
Documentation clearly identifies the left anatomical site.
Documentation Requirements
Document the left anatomical site.
Include the procedure or service performed.
Support medical necessity.
Maintain complete physician documentation.
Ensure the medical record identifies the correct laterality.
Examples
Example 1
A physician performs a corticosteroid injection into the patient's left shoulder. Modifier LT is appended to identify the procedure was performed on the left side.
Example 2
A patient receives a left ankle brace following an injury. Modifier LT is reported with the appropriate HCPCS code to identify the item was provided for the left side.
Billing Tips
Use LT only when reporting services performed on the left side.
Confirm the procedure code allows laterality modifiers.
Ensure documentation supports the anatomical site.
Follow payer-specific billing requirements.
Verify whether LT, RT, or bilateral reporting is required.
Common Billing Mistakes
Reporting LT when the procedure code already specifies the left side.
Failing to document the anatomical site.
Using LT when RT should be reported.
Reporting LT when bilateral modifiers are required.
Omitting laterality when required by the payer.
Related Modifiers
Modifier RT
Right Side
Modifier 50
Bilateral Procedure
Modifier 59
Distinct Procedural Service
Additional Resources
CPTCodeGuide provides a concise reference for Modifier LT. For detailed billing guidance, documentation requirements, examples, anatomical coding rules, and modifier comparisons, visit ModifierLookup.com for the complete Modifier LT guide.
