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KX modifier related questions

S

ShobihaaS

Contributor
Messages
15
Location
Nugegoda, CO
My understanding is as follows:
  • Medicare and some commercial payers limit the number of therapeutic facet joint injections or medial branch block sessions allowed within a 12-month period. Because diagnostic and therapeutic procedures share the same CPT codes, appending the KX modifier to a diagnostic block indicates that the service should not count toward the annual therapeutic frequency limit.
  • Medicare typically covers up to two initial diagnostic medial branch block sessions. If additional diagnostic blocks are medically necessary after these initial sessions, the KX modifier is appended to bypass the frequency edit.
Based on this understanding, if the operative note documents procedures such as "Diagnostic Cervical Medial Branch Block" or "Diagnostic Lumbar Medial Branch Block #1," my interpretation is:

  1. A therapeutic injection would not require the KX modifier solely for being therapeutic.
  2. The first and second diagnostic sessions would generally not require the KX modifier; KX would only become applicable when additional medically necessary diagnostic sessions are performed beyond the initial two.
Is my understanding correct, or are there payer-specific or Medicare policy nuances that I may be overlooking? I would appreciate any guidance or references from those who have encountered this scenario in practice.
 
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