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The rules say that plans must pay for a medical service or item if regular Medicare would pay for it in this case. You can find this rule at 42 Code of Federal Regulations (CFR) Section 422.101.

The rules state that a non-expandable controller has the following features: 

May have the ability to control up to 2 power seating actuators through the drive control (for example, seat elevator and single actuator power elevating legrests). (Note: Control of the power seating actuators though the Control Input Device would require the use of an additional component, E2310 or E2311.)

Can accommodate only an integral joystick or a standard proportional remote joystick 

May allow for the incorporation of an attendant control

An expandable controller is capable of accommodating one or more of the following additional functions: 

Other types of proportional input devices (e.g., mini-proportional or compact joysticks, touchpads, chin control, head control, etc.)

Non-proportional input devices (e.g., sip and puff, head array, etc.) 

Operate 3 or more powered seating actuators through the drive control. (Note: Control of the power seating actuators though the Control Input Device would require the use of an additional component, E2310 or E2311.)

An expandable controller may also be able to operate one or more of the following: 

A separate display (i.e., for alternate control devices) 

Other electronic devices (e.g., control of an augmentative speech device or computer through the chair's drive control) 

An attendant control

A harness (E2313) describes all of the wires, fuse boxes, fuses, circuits, switches, etc. that are required for the operation of an expandable controller. It also includes all the necessary fasteners, connectors, and mounting hardware. Code E2313 is separately billable in addition to an expandable controller both at initial issue and with complete replacement of the expandable controller. Code K0108 must not be used for any component or feature of an expandable controller at the time of initial issue. The reimbursement for any type of complete expandable controller is included in the allowance for codes E2377/E2376 plus E2313. However, if individual components of the harness are replaced, code K0108 should be used.

A switch is an electronic device which turns power to a particular function either "on" or "off". The external component of a switch may be either mechanical or non-mechanical. Mechanical switches involve physical contact in order to be activated. Examples of the external components of mechanical switches include, but are not limited to, toggle, button, ribbon, etc. Examples of the external components of non-mechanical switches include, but are not limited to, proximity, infrared, etc. Some of the codes include multiple switches. In those situations, each functional switch may have its own external component or multiple functional switches may be integrated into a single external switch component or multiple functional switches may be integrated into the wheelchair control interface without having a distinct external switch component.

A power seat elevation feature (E2300) and power standing feature (E2301) are non-covered because they are not primarily medical in nature. If a wheelchair has an electrical connection device described by code E2310 or E2311 and if the sole function of the connection is for a power seat elevation or power standing feature, it will be denied as non-covered.

You can find this information in the Local Coverage Article Wheelchair Options/Accessories - Policy Article (A52504).

If you want to read these Medicare rules, you can go to this website www.medicareappeal.com.