Does G56.40 require prior authorization?

No, G56.40 does not require prior authorization (medium confidence). Covered without prior authorization by at least one policy, though another does not cover it.

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`G56.40`, Causalgia of unspecified upper limb

ICD-10-CM

Prior Authorization

No Prior Auth Required

Covered without prior authorization by at least one policy, though another does not cover it (medium confidence)

Documentation Required

Claims and documentation requirements for CPNB are governed by and must follow the Local Coverage Determination L37641 referenced by this guideline.
Claims and coding must follow the Local Coverage Determination L37642 that this article complements; medical record documentation should support the billed service in accordance with LCD L37642.
Medical records must include history and physical notes, laboratory results, and documentation of signs and symptoms that warrant the head/neck diagnostic imaging.
Accurate HCPCS/CPT coding must be submitted to differentiate CT and MRI scans from other radiology services and to support coverage determinations.

Key Coverage Criteria

No specific coverage indications are stated in this billing/coding guideline; refer to Local Coverage Determination L37641 for covered indications for continuous peripheral nerve blocks (CPNB).
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.
NC-stat testing (CPT 95905) is allowed when the beneficiary has a high pre-test or prior probability of Carpal Tunnel Syndrome (CTS), limited to one service per arm.
Use CPT 95870 for sampling muscles other than the paraspinals associated with the extremities that have been tested.
Peripheral nerve blocks are covered when they meet the reasonable and necessary requirements specified in LCD L33933.

10 Active Policies

A57668, Billing and Coding: Nerve Conduction Studies and Electromyography

NGS-J6-L35098, Nerve Conduction Studies and Electromyography

FIRST_COAST-L33933, Peripheral Nerve Blocks

NGS-JK-L35098, Nerve Conduction Studies and Electromyography

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G56.40, Causalgia of unspecified upper limb