- Neurinomatosis (M9560/1) - see also Neoplasm, connective tissue, uncertain behavior
- Neuritis (see also Neuralgia) 729.2
- Neuro-avitaminosis 269.2
- Neuroangiomatosis, encephalofacial 759.6
- Neuroastrocytoma (M9505/1) - see Neoplasm, by site, uncertain behavior
- Neuroblastoma (M9500/3)
- Neurochorioretinitis (see also Chorioretinitis) 363.20
- Neurocirculatory asthenia 306.2
- Neurocytoma (M9506/0) - see Neoplasm, by site, benign
- Neurodermatitis (circumscribed) (circumscripta) (local) 698.3
- Neuroencephalomyelopathy, optic 341.0
- Neuroendocrine tumor - see Tumor, neuroendocrine
- Neuroepithelioma (M9503/3) - see also Neoplasm, by site, malignant
- Neurofibroma (M9540/0) - see also Neoplasm, connective tissue, benign
- Neurofibromatosis (multiple) (M9540/1) 237.70
- Neurofibrosarcoma (M9540/3) - see Neoplasm, connective tissue, malignant
- Neurogenic - see also condition
- Neuroglioma (M9505/1) - see Neoplasm, by site, uncertain behavior
- Neurolabyrinthitis (of Dix and Hallpike) 386.12
- Neurolathyrism 988.2
- Neuroleprosy 030.1
- Neuroleptic malignant syndrome 333.92
