ICD-10-CM › H00-H59 › H49-H52 › H49.1 Fourth [trochlear] nerve palsy › H49.11
Fourth [trochlear] nerve palsy, right eye
ValidICD-10-CM diagnosis code.
Valid for claims with a date of service in the current code year.
What has happened to this code
Every change the publisher made, from 2007 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.
- FY2007 Added to the draft code set draft Fourth [trochlear] nerve palsy, right eye
Official coding rules
Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.
Inherited from H49 Paralytic strabismus
Excludes2 - not included here
- internal ophthalmoplegia (H52.51-)
- internuclear ophthalmoplegia (H51.2-)
- progressive supranuclear ophthalmoplegia (G23.1)
Inherited from the H49-H52 section Disorders of ocular muscles, binocular movement, accommodation and refraction (H49-H52)
Excludes2 - not included here
- nystagmus and other irregular eye movements (H55)
How CDC's index refers to this code
Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.
- Squint
- Heterotropia
- Neurophthisis
- Neurosclerosis
- Ophthalmoplegia
- Endoperineuritis
- Irritation > nerve
- Compression > nerve
- Neuritis > trochlear
- Palsy > cranial nerve
- Disorder > cranial nerve
- Atrophy, atrophic > nerve
- Disease, diseased > nerve
- Syndrome > eye retraction
- Irritation > cranial nerve
- Disorder > nerve > cerebral
- Disturbance > cranial nerve
- Mononeuritis > cranial nerve
- Paralysis, paralytic > nerve
- Compression > nerve > cranial
- Disturbance > cerebral > nerve
- Lesion > cranial nerve > fourth
- Disease, diseased > eye > muscle
- Disorder > nerve > trochlear NEC
- Paralysis, paralytic > trochlear
- Degeneration, degenerative > nerve
- Neuropathy, neuropathic > ischemic
- Disease, diseased > muscle > ocular
- Cicatrix > muscle > with contracture
- Compression > cranial nerve > fourth
- Insufficiency, insufficient > muscle
- Atrophy, atrophic > nerve > trochlear
- Neuralgia, neuralgic > nerve, cranial
- Degeneration, degenerative > Wallerian
- Neuralgia, neuralgic > cranial > nerve
- Disorder > nerve > cranial > fourth NEC
- Paralysis, paralytic > nerve > trochlear
- Atrophy, atrophic > nerve > cranial > fourth
- Contraction, contracture, contracted > flaccid
- Neuritis > cranial nerve > fourth or trochlear
Showing 40 of 54 index phrases.
Codes in the same group
| Code | Description | Status |
|---|---|---|
| H49.10 | Fourth [trochlear] nerve palsy, unspecified eye | Valid |
| H49.12 | Fourth [trochlear] nerve palsy, left eye | Valid |
| H49.13 | Fourth [trochlear] nerve palsy, bilateral | Valid |