| G47419 | Narcolepsy without cataplexy |
| G4742 | Narcolepsy in conditions classified elsewhere |
| G47421 | Narcolepsy in conditions classified elsewhere with cataplexy Narcolepsy in conditions classified elsewhere with cataplexy |
| G47429 | Narcolepsy in conditions classified elsewhere without cataplexy |
| G475 | Parasomnia |
| G4750 | Parasomnia, unspecified |
| G4751 | Confusional arousals |
| G4752 | REM sleep behavior disorder |
| G4753 | Recurrent isolated sleep paralysis |
| G4754 | Parasomnia in conditions classified elsewhere |
| G4759 | Other parasomnia |
| G476 | Sleep related movement disorders |
| G4761 | Periodic limb movement disorder |
| G4762 | Sleep related leg cramps |
| G4763 | Sleep related bruxism |
| G4769 | Other sleep related movement disorders |
| G478 | Other sleep disorders |
| G479 | Sleep disorder, unspecified |
| G50 | Disorders of trigeminal nerve |
| G500 | Trigeminal neuralgia |
| G501 | Atypical facial pain |
| G508 | Other disorders of trigeminal nerve |
| G509 | Disorder of trigeminal nerve, unspecified |
| G51 | Facial nerve disorders |
| G510 | Bell's palsy |
| G511 | Geniculate ganglionitis |
| G512 | Melkersson's syndrome |
| G513 | Clonic hemifacial spasm |
| G5131 | Clonic hemifacial spasm, right |
| G5132 | Clonic hemifacial spasm, left |
| G5133 | Clonic hemifacial spasm, bilateral |
| G5139 | Clonic hemifacial spasm, unspecified |
| G514 | Facial myokymia |
| G518 | Other disorders of facial nerve |
| G519 | Disorder of facial nerve, unspecified |
| G52 | Disorders of other cranial nerves |
| G520 | Disorders of olfactory nerve |
| G521 | Disorders of glossopharyngeal nerve |
| G522 | Disorders of vagus nerve |
| G523 | Disorders of hypoglossal nerve |
| G527 | Disorders of multiple cranial nerves |
| G528 | Disorders of other specified cranial nerves |
| G529 | Cranial nerve disorder, unspecified |
| G53 | Cranial nerve disorders in diseases classified elsewhere |
| G54 | Nerve root and plexus disorders |
| G540 | Brachial plexus disorders |
| G541 | Lumbosacral plexus disorders |
| G542 | Cervical root disorders, not elsewhere classified |
| G543 | Thoracic root disorders, not elsewhere classified |
| G544 | Lumbosacral root disorders, not elsewhere classified |