Is it appropriate to append modifiers to "unlisted procedure" codes?

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When an add-on code is used, must the service or procedure reported be performed by (2016)
Is it appropriate to append modifiers to unlisted procedure codes (eg, 64999, Unlisted procedure, nervous (2006)
If an add-on code is used, does the service or procedure described by the add-on (2010)
Is it appropriate to append modifiers to unlisted procedure codes (eg, code 64999 Unlisted procedure (2006)
Can I append modifier 22 to an E/M service? (2010)
Who decides when and if it is appropriate to append Modifier 52, Reduced services? (2007)
When is it appropriate to append modifier 51? (2010)
May modifier 22, Increased Procedural Services, be appended to add-on codes? (2012)
When I report a code from the special services, procedures and reports (99000 (REVISED IN (2015)
Is it appropriate to append modifiers to the new CPT category III codes? (2011)
When is it appropriate to report an unlisted laboratory procedure? (2010)
If a procedure is performed laparoscopically, but there is not a specific laparoscopic code that (2006)

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AMA CPT® Knowledge Base - Jan 22, 2007

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