- Nephrosonephritis hemorrhagic (endemic) 078.6
- Nephrostomy status V44.6
- Nerve - see condition
- Nerves 799.2
- Nervous (see also condition) 799.2
- Nervousness 799.2
- Nesidioblastoma (M8150/0)
- Netherton's syndrome (ichthyosiform erythroderma) 757.1
- Nettle rash 708.8
- Nettleship's disease (urticaria pigmentosa) 757.33
- Neumann's disease (pemphigus vegetans) 694.4
- Neuralgia, neuralgic (acute) (see also Neuritis) 729.2
- Neurapraxia - see Injury, nerve, by site
- Neurasthenia 300.5
- Neurilemmoma (M9560/0) - see also Neoplasm, connective tissue, benign
- Neurilemmosarcoma (M9560/3) - see Neoplasm, connective tissue, malignant
- Neurilemoma - see Neurilemmoma
- Neurinoma (M9560/0) - see Neurilemmoma
- Neurinomatosis (M9560/1) - see also Neoplasm, connective tissue, uncertain behavior
- Neuritis (see also Neuralgia) 729.2
- Neuro-avitaminosis 269.2
- Neuroangiomatosis, encephalofacial 759.6
