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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 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. 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 For power wheelchairs which are capable of being upgraded to an expandable controller (K0835, K0836, K0837, K0838, K0839, K0840, K0841, K0842, K0843, K0848, K0849, K0850, K0851, K0852, K0853, K0854, K0855, K0856 K0857, K0858, K0859, K0860, K0861 K0862, K0863, K0864, K0868, K0869, K0870, K0871, K0877, K0878, K0879, K0880, K0884, K0885, K0886, K0890, K0891), E2377 is used if an expandable controller is provided at the time of initial issue. Code E2376 is used with complete replacement of an expandable controller. 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 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.