Understanding the packaging indicator in a GTIN-14 is essential for distinguishing pharmaceutical products across different packaging levels. From single-dose units to master cases, this leading digit encodes a product’s position in the packaging hierarchy—without changing its identity. Correct usage ensures seamless serialization, barcode accuracy, and DSCSA compliance. Whether labeling a vial or pallet, assigning the right packaging indicator is a small step with big implications for traceability and supply chain integrity.