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Name of the Condition
- Sixth [abducent] nerve palsy, bilateral
Summary
Sixth nerve palsy, bilateral, involves weakness or paralysis of the abducent nerve in both eyes, which controls the lateral rectus muscles responsible for outward eye movement. This can lead to double vision (diplopia) and difficulty moving both eyes outward. The condition affects both eyes, and the underlying cause may or may not be identified.
Causes
Causes can include trauma, increased intracranial pressure, tumors, microvascular ischemia (often related to diabetes or hypertension), infections, or inflammation. In some cases, the cause remains unknown (idiopathic).
Risk Factors
- Age (older adults)
- History of diabetes or hypertension
- Head trauma or injury
- Prior vascular conditions
- Inflammatory or infectious diseases affecting the nervous system
Symptoms
- Double vision (diplopia), especially when looking to the side
- Difficulty moving both eyes outward
- Head turn to compensate for vision changes
- Misalignment of the eyes (strabismus)
Diagnosis
Diagnosis is made through a detailed eye exam, including tests of eye movement and alignment. Imaging studies like MRI or CT scans may be used to identify underlying causes such as tumors or increased intracranial pressure. Blood tests or other evaluations may be performed to assess for systemic conditions.
Treatment Options
Treatment may involve eye patches or prisms to manage double vision, eye exercises, or surgery in some cases. Addressing the underlying cause, if identified, is also a key part of management.
Prognosis and Follow-Up
Prognosis depends on the underlying cause. Some cases resolve spontaneously, while others may require ongoing management. Regular follow-up with an eye specialist is important to monitor eye alignment and vision.
Complications
Potential complications include persistent double vision, chronic eye misalignment, or reduced quality of life due to vision changes.
Lifestyle & Prevention
Managing risk factors like diabetes or hypertension may help reduce the risk. Avoiding head trauma and seeking prompt treatment for infections or inflammation can also be beneficial.
When to Seek Professional Help
Seek medical attention if you experience sudden double vision, difficulty moving your eyes, or other vision changes. Prompt evaluation is important to identify and address the underlying cause.
Tips for Medical Coders
Use H49.23 for bilateral sixth nerve palsy. Ensure documentation specifies bilateral involvement and supports the diagnosis. Include details about underlying causes or associated conditions when available to support accurate coding.
Medical Policies and Guidelines
Related policies from health plans
H49.23 policy automation walkthrough
Walk through the policies, prior authorization requirements, and workflow automation opportunities connected to this code.