ICD-10 Code H35.042 – Retinal micro-aneurysms, unspecified, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H35.042 – Retinal micro-aneurysms, unspecified, left eye
What it is
This code identifies retinal micro-aneurysms in the left eye when the record does not specify a cause or subtype. It points to small, localized retinal vessel outpouchings noted on eye examination.
Clinical signs
Clinical features vary; refer to documentation. Findings may include micro-aneurysms seen on dilated fundus exam or retinal imaging, sometimes with associated retinal bleeding or edema if documented.
When to use this code
Use H35.042 when the provider documents retinal micro-aneurysms limited to the left eye and does not name a more specific retinal disorder. Apply it when the chart clearly supports laterality and the condition is recorded as unspecified. If both eyes or another retinal disease are documented, check documentation before coding.
Do not use for
Do not use this code for bilateral disease, right-eye involvement, or a more specific retinal diagnosis. It is also inappropriate if the record only mentions diabetic retinopathy or another cause without documenting retinal micro-aneurysms.
Coding tip
Confirm laterality and whether the provider documented micro-aneurysms as the primary finding before assigning H35.042.