A Guide to Understanding 21 CFR Part 820
Learn about the 21 CFR Part 820 guidelines, why it’s important, and the best practices for implementing it effectively into manufacturing procedures.

Published 30 Jun 2025
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5 min read
What is 21 CFR Part 820?
21 CFR Part 820 is a section of the US Food and Drug Administration (FDA) regulations that establishes the Quality System Regulation (QSR) requirements for medical device manufacturers who market their products within the US. It mandates that manufacturers implement and maintain a quality management system to ensure that medical devices are consistently designed, produced, packaged, labeled, stored, installed, and serviced in a manner that meets applicable safety and performance requirements.
Compliance with 21 CFR Part 820 is critical for FDA approval and continued market access, and violations can lead to enforcement actions such as warning letters, recalls, fines, or legal penalties.
What’s the Difference Between 21 CFR Part 820 and ISO 13485?
Both 21 CFR part 820 and ISO 13485 set out requirements for current good manufacturing practices (cGMP) in the medical device industry.
Medical devices must perform consistently and reliably under a wide range of conditions, and even minor defects can lead to serious injuries, misdiagnoses, or fatalities. Implementing rigorous quality control also ensures that each device meets strict design specifications, regulatory requirements, and performance standards before it reaches the patient.
However, these two frameworks mainly differ in their regulatory authority, geographic scope, and specific focus:
21 CFR Part 820 is a mandatory FDA regulation that defines cGMP requirement for medical device manufacturers selling products in the US. Compliance is legally required, and violations can result in enforcement actions.
ISO 13485 is an internationally recognized, voluntary standard for quality management systems in the medical device sector. It focuses more on risk management and product lifecycle, and is widely used by companies selling devices globally.
Both guidelines involve document control, design controls, corrective and preventive action (CAPA), and internal audits to ensure good manufacturing practices are followed throughout the production process.
Ensure Compliance with Manufacturing Regulations
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FDA Requirements for 21 CFR Part 820
The 21 CFR Part 820 regulation is quite dense, but provides great detail about what the FDA expects from manufacturers to ensure compliance with quality standards. Here is a list of key requirements to take into account for easier understanding of its requirements:

FDA Requirements for 21 CFR Part 820
Quality Management System: Manufacturers must establish and maintain a quality system that covers all aspects of design, production, and distribution of medical devices.
Design Controls: This subsection requires that for certain types of devices, companies must document and control the design process to ensure the final product meets user needs and intended uses.
Document Controls: Procedures must be in place to review, approve, distribute, and revise all quality system documents. It is important that documentation is proactively completed before the final product is released to ensure quality control.
Purchasing Controls: Manufacturers must evaluate and control suppliers, contractors, and consultants to ensure purchased products and services meet specified requirements.
Identification and Traceability: Under this regulation, manufacturers are required to establish procedures to clearly identify products throughout all stages of manufacturing to prevent mix-ups and make their devices traceable through records that link each device to its components, manufacturing process, and distribution history for effective recall and safety management.
Production and Process Controls: These include proper monitoring and control of manufacturing processes, process validation, and ensuring equipment is suitable and properly maintained.
Acceptance Activities: This subsection covers the acceptance process of whether a product conforms with the pre-established criteria for manufacturing. It requires manufacturers to check for the manufacturing, packaging, labeling, installation, and servicing of the product.
Nonconforming Product: In line with the previous section, there must also be procedures to control and handle products that do not meet specifications, including evaluation, disposition, and reworks, if necessary.
Corrective and Preventive Action (CAPA): Manufacturers must establish procedures to identify, investigate, and correct quality problems and take preventive steps to avoid systemic flaws in the manufacturing process.
Labeling and Packaging Control: Devices must be labeled and packaged correctly to avoid errors and damage during shipping and storage. The FDA also requires a control number, when applicable, for each unit to follow the device through distribution. It is important to avoid blanket rules on labeling products and comply with the specific labeling requirements established by the FDA.
Handling, Storage, Distribution, and Installation: These processes must be controlled to prevent contamination, damage, or degradation of the device.
Record Keeping: This includes maintaining Device Master Records (DMR), Device History Records (DHR), and Quality System Records (QSR) that provide evidence of compliance and traceability.
Servicing: If a device requires servicing or maintenance, the manufacturer must maintain records of service activities and ensure servicing meets requirements.
Statistical Techniques: Where appropriate, statistical methods must be used to establish, control, and verify the acceptability of process capability and product characteristics.
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