2021 ICD-10-CM Code H49.12
Fourth [trochlear] nerve palsy, left eye
Valid for Submission
H49.12 is a billable diagnosis code used to specify a medical diagnosis of fourth [trochlear] nerve palsy, left eye. The code H49.12 is valid during the fiscal year 2021 from October 01, 2020 through September 30, 2021 for the submission of HIPAA-covered transactions.
| ICD-10: | H49.12 |
| Short Description: | Fourth [trochlear] nerve palsy, left eye |
| Long Description: | Fourth [trochlear] nerve palsy, left eye |
Code Classification
Convert H49.12 to ICD-9 Code
The General Equivalency Mapping (GEM) crosswalk indicates an approximate mapping between the ICD-10 code H49.12 its ICD-9 equivalent. The approximate mapping means there is not an exact match between the ICD-10 code and the ICD-9 code and the mapped code is not a precise representation of the original code.
- 378.53 - Fourth nerve palsy (Approximate Flag)
Information for Patients
Eye Movement Disorders
When you look at an object, you're using several muscles to move both eyes to focus on it. If you have a problem with the muscles, the eyes don't work properly.
There are many kinds of eye movement disorders. Two common ones are
- Strabismus - a disorder in which the two eyes don't line up in the same direction. This results in "crossed eyes" or "walleye."
- Nystagmus - fast, uncontrollable movements of the eyes, sometimes called "dancing eyes"
Some eye movement disorders are present at birth. Others develop over time and may be associated with other problems, such as injuries. Treatments include glasses, patches, eye muscle exercises, and surgery. There is no cure for some kinds of eye movement disorders, such as most kinds of nystagmus.
- Cranial mononeuropathy III (Medical Encyclopedia)
- Cranial mononeuropathy VI (Medical Encyclopedia)
- Eye muscle repair (Medical Encyclopedia)
- Nystagmus (Medical Encyclopedia)
- Strabismus (Medical Encyclopedia)
- Supranuclear ophthalmoplegia (Medical Encyclopedia)
[Learn More]
Code History
- FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
- FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
- FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
- FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
- FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
- FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016 (First year ICD-10-CM implemented into the HIPAA code set)