Title 21 of the Code of Federal Regulations (CFR) covers the broad area of food and drugs
Part 820 outlines
Quality Systems for medical device manufacturers.
Current Good Manufacturing Practice
(CGMP) regulations that govern the methods used in, and the facilities and controls used for, the design, manufacture, packaging, labeling, storage, installation, and servicing of all finished devices intended for human use.
These requirements are meant to ensure that medical devices are safe, effective, and in
compliance with the Federal Food, Drug, and Cosmetic Act.
Where do they each apply?
ISO 13485 is a global standard that is voluntary in the US but required in some countries. Third party registrars (CB's) conduct audits to ensure conformance.
The Food and Drug Administration enforces 21 CFR 820.
21 CFR 820 is applicable to manufacturers of finished medical devices sold in the United States,
including imported products. Only parts of the requirement may apply, depending on the class.