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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 say that medically necessary services are those that are reasonable and necessary for the diagnosis or 
treatment of an illness or injury. Medically necessary services include services to improve the functioning of a 
malformed body member. You can find this rule in the Social Security Act, Section 1862(a)(1)(A). 
 
The rules say that services that are not medically necessary are not covered. The rules also say that 
experimental and investigational devices are not covered. You can find this rule at 42 CFR Sections 411.15 and 
411.15(o). 
 
The rules say that an expandable controller is capable of accommodating one or more of the following 
additional functions: 
 
- Other types of proportional input devices (such as, mini-proportional or compact joysticks, touchpads, chin 
control, head control, and so on) 
- Non-proportional input devices (such as, sip and puff, head array, and so on) 
- 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 (for example, for alternate control devices) 
- Other electronic devices (such as, control of an augmentative speech device or computer through the chair's 
drive control) 
- An attendant control 
 
You can find this rule in Local Coverage Article: Power Mobility Devices - Policy Article (A52498) - Effective January 1, 2020. 
 
The rules say that procedure code E2311 describes 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. 
 
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. You can find this 
information in the Local Coverage Article for 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.