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You can find this rule at 42 Code of Federal Regulations (CFR) Section 422.101.
The rules state that Codes E2310 and E2311 describe the electronic components that allow the beneficiary to control two or more of the following motors from a single interface (e.g., proportional joystick, touchpad, or non-proportional interface): power wheelchair drive, power tilt, power recline, power shear reduction, power leg elevation, power seat elevation, power standing. It includes a function selection switch which allows the beneficiary to select the motor that is being controlled and an indicator feature to visually show which function has been selected. When the wheelchair drive function has been selected, the indicator feature may also show the direction that has been selected (forward, reverse, left, right). This indicator feature may be in a separate display box or may be integrated into the wheelchair interface. Payment for the code includes an allowance for fixed mounting hardware for the control box and for the display box (if present). The term controller describes the microprocessor and other related electronics that receive and interpret input from the joystick (or other drive control interface) and convert that input into power output which controls speed and direction. A high power wire harness connects the controller to the motor and gears. An expandable controller is capable of accommodating one or more of the following additional functions: A. Other types of proportional input devices (e.g., mini-proportional or compact joysticks, touchpads, chin control, head control, etc.) B. Non-proportional input devices (e.g., sip and puff, head array, etc.) C. 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. You can find this information in the Wheelchair Options/Accessories - Policy Article (A52504).
If you want to read these Medicare rules, you can go to this website www.medicareappeal.com.
The Plan contract says that the Plan covers items and services in accordance with Medicare rules.