CND Category The first hierarchical level of the CND is defined as a "Category". There are 22 categories, each identified by a letter of the alphabet:
Anatomic Categories – by anatomical area of use:
| B | HEMATOLOGY AND HEMOTRANSFUSION DEVICES |
| C | CARDIOCIRCULATORY DEVICES |
| F | DYALISIS DEVICES |
| G | GASTROINTESTINAL DEVICES |
| N | DEVICES FOR NERVOUS AND MEDULLAR SYSTEMS |
| Q | DENTAL, OPHTALMOLOGIC AND ENT DEVICES |
| R | RESPIRATORY SISTEM AND ANAESTHESIA DEVICES |
| U | UROGENITAL APPARATUS DEVICES |
Functional Categories – by intended use or clinical method:
| A | DEVICES FOR ADMINISTRATION, COLLECTING AND PICKING |
| D | DISINFECTANTS, ANTISEPTICS AND PROTEOLYTICS FOR MEDICAL DEVICES (regulated by Italian Legislative Decree No. 46/97 and European Directive 93/42/EEC) |
| H | SUTURE DEVICES |
| K | ENDOTHERAPY AND ELECTROSURGICAL DEVICES |
| L | REUSABLE SURGICAL INSTRUMENTS |
| M | DEVICES FOR GENERIC AND SPECIALISTIC MEDICATION |
| S | STERILIZATION DEVICES |
| T | PROTECTION DEVICES AND INCONTINENCE AIDS (regulated by Italian Legislative Decree No. 46/97 and European Directive 93/42/EEC) |
| V | MEDICAL DEVICES - VARIOUS |
Special Categories – by other criteria:
| J | ACTIVE-IMPLANTABLE DEVICES: MDs regulated by Directive 385/90 EEC |
| P | IMPLANTABLE PROSTHETIC DEVICES AND OSTEOSYNTHESIS DEVICES: non-active implantable MDs |
| Y | SUPPORTS OR TECHNICAL AIDS FOR DISABLED PERSONS |
| W | IN VITRO DIAGNOSTIC DEVICES MDs regulated by Directive 98/79 EEC |
| Z | MEDICAL EQUIPMENT AND RELATED ACCESSORIES AND MATERIALS |