ICD-10 Code H52.512 – Internal ophthalmoplegia (complete) (total), left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H52.512 – Internal ophthalmoplegia (complete) (total), left eye
What it is
H52.512 identifies complete internal ophthalmoplegia affecting the left eye. It means the eye’s internal focusing and pupil responses are fully impaired.
Clinical signs
Findings typically include a fixed or poorly reactive pupil and loss of accommodation in the left eye. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents complete, total internal ophthalmoplegia limited to the left eye. It fits cases where the diagnosis is stated clearly in the record, including ophthalmology or neurology assessments.
If laterality is documented as left and the condition is complete rather than partial, this code is the specific choice. Check documentation if the note only says ophthalmoplegia without internal, total, or side.
Do not use for
Do not use this code for external ophthalmoplegia, unspecified ophthalmoplegia, or right-eye involvement. Do not assume it applies when the record is vague or incomplete.
Coding tip
Confirm both laterality and “complete/total” wording in the documentation before assigning H52.512.