Does G46.8 require prior authorization?

No, G46.8 does not require prior authorization (high confidence). Code is covered without prior authorization.

`G46.8` — Other vascular syndromes of brain in cerebrovascular diseases

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.'
Compounded medications for use in implantable infusion pumps may be covered by Medicare when their use meets all other criteria for services provided incident to a physician's service.
True off-the-shelf (non‑compounded) drugs used without compounding and administered via DME may be billed using the drug-specific HCPCS code and are reimbursed under CMS ASP methodology.
If Prialt® is implanted as a single agent in the pump, bill using HCPCS code J2278-KD.

A56551 — Billing and Coding: Visual Fields Testing

J06

L33574 — Visual Fields Testing

J06

A57637 — Billing and Coding: Visual Field Examination

J09

L33766 — Visual Field Examination

J09

L35397 — Non-Invasive Cerebrovascular Arterial Studies

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