ICD-10 Code H53.33 – Simultaneous visual perception without fusion (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H53.33 – Simultaneous visual perception without fusion
What it is
H53.33 identifies impaired simultaneous visual perception without fusion, meaning the eyes can detect images at the same time but the brain does not combine them into one single view.
Clinical signs
Clinical features vary; refer to documentation. Patients may report double vision, difficulty coordinating both eyes, or abnormal binocular visual function on exam.
When to use this code
Use this code when the provider documents simultaneous visual perception without fusion, binocular vision dysfunction, or a similar diagnosis tied to impaired fusion. Code it only when the record clearly supports a fusion problem rather than a general visual complaint. Check documentation if the wording is unclear.
Do not use for
Do not use this code for nonspecific blurred vision, refractive error, or ordinary diplopia without documentation of impaired fusion. If the diagnosis is different or uncertain, check documentation.
Coding tip
Match the code to the provider’s exact binocular vision terminology and avoid assuming fusion impairment from symptoms alone.