Modifier 59 Compatibility with CPT Codes 87040 & 87070

Modifier 59 (Distinct Procedural Service) may be appended to CPT 87040 (Culture, bacterial; blood, aerobic) and 87070 (Culture, bacterial; any other source except blood, aerobic) when:

• Cultures are obtained from different anatomical sites (e.g., blood + wound, or two distinct wound sites).
• Cultures are collected at separate encounters/times on the same day.
• Cultures represent distinct clinical indications (e.g., sepsis workup + surgical site surveillance).

Key Requirements

• Documentation must support distinctness (separate site, time, or indication).
• Not for repeat cultures from same site for same indication (use modifier 91 for repeat lab tests).
• Payer policies vary—check NCCI edits and local coverage determinations.

CPT Code Definitions

• 87040: Blood culture, aerobic (includes anaerobic if requested).
• 87070: Culture, bacterial; any other source (wound, urine, sputum, etc.), aerobic.

Proper use prevents denials; misuse triggers audits. Always code to documentation.