LMHCPCS Level II
Left main coronary artery
- Usage notes
- Append to cardiac catheterization/intervention codes to identify the left main coronary artery as the vessel treated.
- Common mistakes
- Reporting LM for a left circumflex or left anterior descending intervention — the left main is a distinct, more proximal vessel.
Related modifiers
L1Provider attestation that the hospital laboratory test(s) is not packaged underLCLeft circumflex coronary arteryLDLeft anterior descending coronary arteryLLLease/rental (use the 'll' modifier when dme equipment rental is to be appliedLRLaboratory round tripLSFda-monitored intraocular lens implantLTLeft side (used to identify procedures performed on the left side of the body)LUFractionated payment
Frequently asked questions
What does modifier LM mean?
Left main coronary artery
When do I use modifier LM?
Append to cardiac catheterization/intervention codes to identify the left main coronary artery as the vessel treated.
What's a common mistake with modifier LM?
Reporting LM for a left circumflex or left anterior descending intervention — the left main is a distinct, more proximal vessel.
HCPCS modifier data from CMS. CPT® is a registered trademark of the American Medical Association — CPT modifier descriptions are not included on this site. Always verify codes with authoritative sources before making billing decisions.