| NQX — System, Nucleic Acid Amplification Test, Dna, Methicillin Resistant Staphylococcus Aureus, Direct Specimen | Class 2 / MI |
| NQY — Ventilator, Continuous, Minimal Ventilatory Support, Home Use | Class 2 / AN |
| NQZ — Antigen, Invasive Fungal Pathogens | Class 2 / MI |
| NRA — Prosthesis, Knee, Femorotibial, Unicompartmental, Semi-Constrained, Metal/Polymer, Mobile Bearing | Class 3 / OR |
| NRB — Wound Cleaner, Ultrasound | Class 2 / SU |
| NRC — Pad, Menstrual, Scented, Scented-Deodorized Made Of Common Cellulosic & Synthetic Material W/Established Safety Profile | Class 1 / OB |
| NRD — Unit, Operative Dental, Accessories | Class 1 / DE |
| NRF — Material, Quality Control, Semen Analysis | Class 2 / HE |
| NRH — System, Breath Measurement | Class 1 / CH |
| NRI — Autoantibodies, Nuclear Pore Glycoprotein Gp210 | Class 2 / IM |
| NRJ — Ultrasound, Skin Permeation | Class 2 / SU |
| NRK — Kit, Test, Olfactory | Class 2 / EN |
| NRL — Enzyme Linked Immunoabsorbent Assay, Antibody, B. Anthracis | Class 2 / MI |
| NRN — Leeches, Medicinal | Class U / SU |
| NRP — Sirolimus Test System | Class 2 / TX |
| NRQ — Blade-Form Endosseous Dental Implant | Class 2 / DE |
| NRS — Control Material, Blood Circulating Epithelial Cancer Cell | Class 2 / HE |
| NRU — Chair, Dental, Without Operative Unit | Class 1 / DE |
| NRV — Implantable Radio Frequency Transponder System | Class 2 / HO |
| NRW — Stimulator, Intramuscular, Automatic | Class 2 / HO |
| NRX — Complement 4d (C4d) And Complement Receptor 1 (Cr1) | Class 2 / IM |
| NRY — Catheter, Thrombus Retriever | Class 2 / NE |
| NRZ — Ablation System, High Intensity Focused Ultrasound (Hifu), Mr-Guided | Class 3 / OB |
| NSA — Over-The-Counter Automated External Defibrillator | Class 3 / CV |
| NSB — Patient Personal Hygiene Kit | Class 1 / HO |
| NSC — Injector, Pen | Class 2 / HO |
| NSD — Test, Fluorescence In Situ Hybridization (Fish), For Bladder Cancer Detection And Monitoring For Recurrence | Class 3 / PA |
| NSF — Test, Alpha Fetoprotein L3 Subfraction (Afp-L3%), For Hepatocellular Carcinoma Risk Assessment | Class 2 / IM |
| NSI — System, Imaging, Esophageal, Wireless, Capsule | Class 2 / GU |
| NSJ — Restoration, Noble Metal | Class N / DE |
| NSK — Dentures, Partial | Class N / DE |
| NSL — Dentures, Full | Class N / DE |
| NSM — Restoration, Resin | Class N / DE |
| NSN — Restoration, Resin, Crown And Bridge | Class N / DE |
| NSO — Restoration, Porcelain-Fused-To-Metal | Class N / DE |
| NSP — Restoration, Porcelain | Class N / DE |
| NSQ — Restoration, Base Metal | Class N / DE |
| NSR — Prosthesis, Orthodontic | Class N / DE |
| NSS — Electronic Media, Nausea | Class N / SU |
| NST — Autoantibodies, Acetylcholine Receptor, Acetylcholine Blocking And Non-Blocking | Class 2 / IM |
| NSU — Instrumentation For Clinical Multiplex Test Systems | Class 2 / CH |
| NTB — System, Ablation, Ultrasound And Accessories | Class 2 / SU |
| NTC — Nursing Pad, Hydrogel | Class 1 / HO |
| NTE — Temporary Carotid Catheter For Embolic Capture | Class 2 / CV |
| NTG — Prosthesis, Ankle, Uncemented, Non-Constrained | Class 3 / OR |
| NTH — System, Automated Scanning Microscope And Image Analysis For Fluorescence In Situ Hybridization (Fish) Assays | Class 2 / PA |
| NTI — Drug Metabolizing Enzyme Genotyping Systems | Class 2 / TX |
| NTK — Caries Detector, Laser Light, Transmission | Class 2 / DE |
| NTM — Antigen, Inflammatory Response Marker, Sepsis | Class 2 / MI |
| NTN — Led Light Source | Class 2 / GU |