93970 & 93971
If a limited bilateral study is performed, the code used should be the unilateral or limited study code- 93971. These codes are not just for a unilateral, or limited unilateral study, but encompass a bilateral study, which is otherwise limited, as opposed to complete. Code 93971 may be reported once for a venous study of a single upper extremity and once for a venous study of a single lower extremity when both are studied. This code is intended to identify either the upper extremity or lower extremity when performed. Therefore, code 93971 may be reported twice to identify an upper and lower extremity study. Modifier 59, Distinct Procedural Service, may be appended to denote that these are a separate procedure.
When complete bilateral upper and complete bilateral lower studies are performed on the same date, you may report 93970 two times with modifier 59 appended to the second code.
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