ICD-10 Code H52.519 – Internal ophthalmoplegia (complete) (total), unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H52.519 – Internal ophthalmoplegia (complete) (total), unspecified eye
What it is
This code identifies complete internal ophthalmoplegia in an unspecified eye. It refers to loss of the eye’s internal motor function, usually involving the pupil and accommodation, without naming the affected eye.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include a fixed or poorly reactive pupil and impaired near focusing, with preserved or otherwise described extraocular movement.
When to use this code
Use this code when the record clearly documents complete internal ophthalmoplegia and does not specify left or right eye. It is appropriate when the provider notes pupil and accommodative dysfunction rather than a more general ocular motility disorder. Check documentation if the chart only mentions diplopia, ptosis, or unspecified vision changes.
Do not use for
Do not use this code for external ophthalmoplegia, generalized cranial nerve palsy, or unspecified eye movement disorder unless internal ophthalmoplegia is explicitly documented. If the eye laterality is stated, code the specified eye instead.
Coding tip
Look for wording such as “internal,” “complete,” “total,” and laterality before assigning H52.519.