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Reference

DSCSA and pharmacy inventory glossary

Plain-English definitions for the terms that come up most often in DSCSA compliance work, pharmacy inventory management, and audit preparation. If a term you need is missing, email us and we'll add it.

DSCSA
The Drug Supply Chain Security Act — a U.S. federal law passed in 2013 that requires pharmaceutical supply-chain partners to track every prescription drug package by serialized identifier. Small dispensers (≤25 full-time employees) enter full enforcement on November 27, 2026. Full guide.
Dispenser
Under DSCSA, a pharmacy or other entity that takes possession of prescription drug products for direct dispensing to a patient. Dispensers carry obligations to receive transaction records, verify product authenticity, and operate at the package level.
T3 documents
The three DSCSA transaction documents: Transaction Information (TI), Transaction History (TH), and Transaction Statement (TS). Together they record the chain of custody for each shipment of prescription drug product.
EPCIS
Electronic Product Code Information Services — the GS1 standard format DSCSA partners use to exchange T3 transaction documents electronically. EPCIS-formatted messages replace earlier ASN-based exchanges.
GS1 DataMatrix
The 2D barcode standard DSCSA-compliant manufacturers use to encode the four required package-level data elements (GTIN, lot, serial, expiration). Distinct from older 1D linear barcodes that carried only the NDC.
GTIN
Global Trade Item Number — a 14-digit GS1 identifier that uniquely identifies a manufacturer's product, strength, and package size. Encoded in DSCSA barcodes under Application Identifier (AI) 01.
Application Identifier (AI)
A two- to four-digit prefix that defines what type of data follows in a GS1 barcode. Common pharmaceutical AIs: 01 (GTIN), 17 (expiration date), 10 (lot number), 21 (serial number).
FNC1
The Group Separator character (ASCII 0x1D) used in GS1 barcodes to delimit variable-length fields like lot and serial number. Scanners must be configured to transmit FNC1 for DSCSA barcodes to parse correctly. See setup guide for scanner-side configuration.
NDC
National Drug Code — a 10-digit FDA identifier for prescription drug products, organized in three segments (labeler-product-package). Convertible to an 11-digit CMS format for billing. The blog post NDC package codes covers the format-conversion mechanics.
FEFO
First-Expired-First-Out — the dispensing pattern that pulls the bottle with the earliest expiration date first, regardless of when it arrived. Replaces FIFO for pharmaceutical inventory because expiration matters more than arrival date. See expiration tracking.
FIFO
First-In-First-Out — the dispensing pattern that pulls the oldest bottle first by arrival date. Standard in non-pharmaceutical inventory but inappropriate for prescriptions because it can dispense a newer bottle with a later expiration over an older bottle with an earlier expiration.
Cycle counting
An inventory-counting pattern that counts a sub-section of stock on a rotating schedule instead of closing the pharmacy for an annual full count. Allows the pharmacy to stay open and keeps the inventory record fresh continuously. See the cycle counting guide.
Suspect product
Under DSCSA, a prescription drug that a dispenser has reason to believe is counterfeit, diverted, stolen, or otherwise illegitimate. Suspect product must be quarantined, investigated, and reported to trading partners and the FDA.
Quarantine
Physical and system-level isolation of suspect or recalled product from active dispensing inventory. Quarantined bottles cannot be dispensed and must be tracked in an audit log until disposition.
Reverse distribution
The process of returning expired or pulled prescription drug stock to a wholesaler or reverse-distributor for credit. Subject to per-wholesaler return-manifest formats and per-product return-credit windows. See wholesaler returns.
Authorized trading partner
Under DSCSA, a wholesaler, dispenser, or manufacturer that meets the law's licensure and registration requirements. Dispensers are obligated to buy only from authorized trading partners and to verify their status.
Verification (DSCSA)
The process of confirming a product identifier (GTIN, lot, serial, expiration) against the manufacturer's records before dispensing or reselling. Required for returned saleable product before it can re-enter inventory.
VRS — Verification Router Service
An optional DSCSA infrastructure component that routes verification requests between dispensers, wholesalers, and manufacturers. Used by some DSCSA-compliance services to verify suspect or returned product.
AS2
Applicability Statement 2 — a standardized protocol for securely transmitting EDI or EPCIS messages over HTTPS between trading partners. Used by some DSCSA-compliance services to exchange T3 documents.
Audit pack
A bundled export containing the documents an inspector or auditor typically requests from a pharmacy: active inventory snapshot, full audit log, transaction data, FDA recall match history, return manifest, suspect/quarantine log. RxRescue produces this in one tap.
Stabilization period
The FDA's term for the period between the original DSCSA enforcement deadline and a later compliance date for specific dispenser categories. Small dispensers received a stabilization extension to November 27, 2026.
Package level
Operating at the package level under DSCSA means tracking each individual unit of prescription drug product by its unique serial number, not just at the lot or batch level. Required for small dispensers by November 27, 2026.
openFDA
The FDA's public API surface for drug, recall, adverse-event, and other regulatory data. RxRescue queries openFDA's NDC directory for drug-name enrichment at intake and the recall API for daily inventory match checks.
NCCHC
National Commission on Correctional Health Care — the body that publishes accreditation standards for jail, prison, and juvenile correctional healthcare facilities. The 2026 NCCHC Standards include specific medication-management requirements.
Dispenser of record
The entity whose pharmacy license is named as the dispensing pharmacy for a given facility's prescriptions. In a contractor-operated correctional pharmacy, the contractor is typically the dispenser of record (not the county or facility owner), and carries the DSCSA obligations.
Wholesaler return window
The period before a bottle's expiration date during which a wholesaler will accept the bottle as a return for full or partial credit. Standard full-credit window is 6–9 months pre-expiration; partial-credit windows extend somewhat closer to expiration; post-expiration bottles are almost always worth zero.
No-PHI
A software-design pattern in which Protected Health Information is intentionally excluded from the system's data model. RxRescue's No-PHI boundary keeps inventory data (GTIN, lot, serial, expiration, drug name, quantity) but rejects patient-identifying data at the import boundary. The boundary is designed to keep the system outside HIPAA scope — a deploying organization's compliance officer makes the final determination.
Pharmacy management system (PMS)
Software the pharmacy uses for prescription entry, billing, patient profiles, and dispensing. Examples used by independent pharmacies include Liberty, Rx30, ComputerRx, PrimeRx, and Pharmaserv. Distinct from physical-inventory software like RxRescue.
DEA Form 41
The DEA form used to inventory controlled substances being returned, destroyed, or otherwise removed from active dispensing stock. Required documentation for controlled-substance reverse distribution.
AmerisourceBergen / Cencora
One of the three largest U.S. pharmaceutical wholesalers (alongside Cardinal Health and McKesson). Rebranded as Cencora in 2023 but still commonly referred to as ABC. Operates the AmerisourceBergen ordering portal and reverse-distribution programs.

Updated May 27, 2026. Term missing? Email us and we'll add it.

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