Does G43.A1 require prior authorization?

No, G43.A1 does not require prior authorization (high confidence). Code is covered without prior authorization.

`G43.A1` — Cyclical vomiting, in migraine, intractable

ICD-10-CM

No Prior Auth Required

Code is covered without prior authorization (high confidence)

This article provides billing/coding guidelines that complement the Local Coverage Determination (LCD) L33458 for chemodenervation; follow LCD L33458 for specific coverage criteria and coding guidance.
This billing and coding guideline complements Local Coverage Determination (LCD) L34424 for Magnetic Resonance Angiography; refer to LCD L34424 for clinical indications, medical necessity criteria, and specific coding rules.
Include relevant medical history in the medical record that supports the need for the visual field test.
The medical record must include the ordering provider’s assessment related to the patient’s complaint for the visit when visual field testing is ordered.

Visual field testing is covered when billed to the Part A or Part B MAC with a valid ICD-10-CM diagnosis code that best describes the patient’s condition and when the service is reasonable and necessary.
For diagnostic visual field tests, report the test result on the claim if known; if the result is not known, report the signs or symptoms that prompted the test.
If the service requires a referring/ordering physician, include the ordering/referring physician’s name and NPI on the claim.
CT or MRI scans of the head or neck are covered when the medical record documents the scan is reasonable and necessary for diagnostic evaluation.
Coverage requires documentation supporting clinical indication such as history and physical exam findings, laboratory results, and signs or symptoms that justify the diagnostic test.
Taped and un-taped visual field testing count as one unit of service for MUE (medically unlikely edits) purposes.

A57483 — Billing and Coding: Visual Fields

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L34615 — Visual Fields

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A59808 — Billing and Coding: Botulinum Toxin Injections

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L39908 — Botulinum Toxin Injections

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A59706 — Billing and Coding: Botulinum Toxin Injections

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