FDA UDI Requirements and Medical Device Labeling Guide: DI, PI, GUDID, and GS1 Standards

The United States Food and Drug Administration (FDA) mandates the Unique Device Identification (UDI) system under 21 CFR Part 801 to improve patient safety, streamline medical device traceability, and expedite product recall management.

Medical device labelers distributing products in the United States must ensure their packaging labels comply strictly with FDA UDI rules and applicable issuing agency standards (such as GS1). This guide breaks down the structure of UDI, labeling requirements, and step-by-step implementation in UDImaker.

1. Structure of an FDA UDI: UDI-DI and UDI-PI

An FDA-compliant UDI consists of two distinct segments:

A. UDI-DI (Device Identifier)

The mandatory, fixed portion of a UDI that identifies the labeler and the specific model or version of the device.

• Globally unique identifier.
• Represented as a GTIN (Global Trade Item Number - AI 01) under GS1 standards.
• Serves as the primary key for registering device attributes in the FDA GUDID database.

B. UDI-PI (Production Identifier)

The conditional, variable portion of a UDI encoding production control data:

• Lot/Batch Number: GS1 Application Identifier (10)
• Serial Number: GS1 Application Identifier (21)
• Manufacturing Date: GS1 Application Identifier (11)
• Expiration Date: GS1 Application Identifier (17)
• Distinct identification code for human cell, tissue, or cellular and tissue-based products (HCT/Ps).

2. Dual Data Carrier Requirement: AIDC and HRI

FDA regulations require UDI data to be presented on the medical device label in two formats:

1. AIDC (Automatic Identification and Data Capture): Machine-readable format. Due to space constraints and robust error-correction capabilities, 2D GS1 DataMatrix is the industry standard for medical device packaging.
2. HRI (Human Readable Interpretation): Plain text format legible to clinicians and inspectors, formatted with standard GS1 application identifier parentheses:

(01)00850012345678(11)260810(17)280810(10)LOT12345(21)SN98765

3. FDA Standard Date Format Rule (YYYY-MM-DD)

Under 21 CFR Part 801.18, dates printed in plain text (HRI) on medical device labels must adhere to a standardized format:

• Format: YYYY-MM-DD (Year-Month-Day), e.g., 2026-08-10.
• Purpose: Eliminates ambiguity between international date conventions (such as US MM/DD/YYYY vs European DD/MM/YYYY) to prevent critical medical errors.
• *Note*: While the encoded GS1 DataMatrix string uses YYMMDD (e.g., 260810), the accompanying human-readable text on the label must display the full YYYY-MM-DD structure.

4. GUDID Database Submission

Prior to commercial distribution in the US market, device labelers must submit device metadata to the FDA's Global Unique Device Identification Database (GUDID) via AccessGUDID:

• Over 60 device attributes (brand name, model number, sterile status, latex presence, package counts) tied to each UDI-DI (GTIN) must be uploaded.
• Important: Only the UDI-DI is stored in GUDID. Dynamic production data (UDI-PI such as lot numbers or serial numbers) is NOT submitted to GUDID.

5. Direct Part Marking (DPM) for Reusable Devices

Devices intended to be used more than once and reprocessed (cleaned, disinfected, or sterilized) between uses must carry a permanent UDI directly marked on the device itself:

• Applied via laser etching, dot peen, or chemical etching.
• Ensures device traceability throughout its entire operational lifecycle, even after primary packaging is discarded.

6. Step-by-Step FDA UDI Label Creation in UDImaker

Using UDImaker's browser-based label designer, you can build compliant medical packaging labels without installing desktop software:

Step 1: Set Canvas Dimensions in Millimeters

Define your precise label stock width and height (e.g., 80 mm x 40 mm).

Step 2: Add and Configure GS1 DataMatrix

Select GS1 DataMatrix from the drawing toolbar.

• Populate GTIN (01), Manufacturing Date (11), Expiration Date (17), Lot (10), and Serial (21).
• UDImaker automatically formats FNC1 (ASCII 29) group separators and human-readable text.

Step 3: Add ISO 15223-1 Medical Symbols

Incorporate standard regulatory symbols from the built-in library:

• Manufacturer Symbol (Factory)
• Use-by Date (Hourglass)
• Batch Code (LOT)
• Consult Instructions for Use (ISO 7000-1641)

Step 4: Export Vector PDF or 300 DPI Image

Export as a PDF (matching exact mm page dimensions) or PNG for printing on thermal transfer label printers.