Does G46.4 require prior authorization?

No, G46.4 does not require prior authorization (high confidence). Code is covered without prior authorization.

`G46.4` — Cerebellar stroke syndrome

ICD-10-CM

No Prior Auth Required

Code is covered without prior authorization (high confidence)

When billing these procedures after carotid endarterectomy, include the surgery date and the phrase 'carotid endarterectomy' in the claim narrative.
When reporting a reduced (unilateral/limited) service, append modifier -52 and include an explanation of the reduced service in Item 19 of the CMS-1500 form or electronic equivalent; any appropriate supporting documentation may be submitted with the claim.
Follow Novitas LCD L35397 for the reasonable and necessary documentation requirements and frequency limitations, and consult NCCI edits for correct coding combinations prior to billing Medicare.
The patient's medical record must contain documentation that fully supports the medical necessity for the visual fields testing in accordance with the applicable LCD.

Non-invasive cerebrovascular arterial studies are covered when reasonable and necessary as defined by Novitas Local Coverage Determination (LCD) L35397.
Duplex post-interventional follow-up studies (typically limited and unilateral) are covered for evaluation after cerebrovascular intervention.
Vascular studies performed after carotid endarterectomy are covered when the claim includes the procedure date and the narrative 'carotid endarterectomy.'
G71.21 | Nemaline myopathy
G83.0 | Diplegia of upper limbs
H44.19 | Other endophthalmitis

A56551 — Billing and Coding: Visual Fields Testing

J06

L33574 — Visual Fields Testing

J06

L33766 — Visual Field Examination

J09

A57637 — Billing and Coding: Visual Field Examination

J09

A57361 — Billing and Coding: Monitored Anesthesia Care

Ask Verity about documentation requirements, denial risks, or coverage in your state.