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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 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 
 
The rules say 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. 
 
The rules say miscellaneous options, accessories, or replacement parts for wheelchairs that do not have a 
specific Healthcare Common Procedure Coding System (HCPCS) code and are not included in another code 
should be coded K0108.  
 
You can find this information in the Local Coverage Article (LCA): Wheelchair Options/Accessories 
(A52504). 
 
The rules say that Medicare will pay for durable medical equipment that is mainly used to serve a medical 
purpose. Items such as hospital beds, respirators, wheelchairs and crutches are examples of equipment that are 
clearly used for medical purposes. Medicare will not pay for: 
 
1. Equipment that is primarily and customarily used for nonmedical purposes. Examples include air 
conditioners, humidifiers, dehumidifiers and electric air cleaners; 
2. Equipment used for a patients comfort or for the convenience of a person caring for the patient. Examples 
include elevators, stairway elevators, physical fitness equipment and self-help devices such as grab bars. You 
can find these rules in the Centers for Medicare and Medicaid Services, Internet Only Manual, Publication 100-
02, Medicare Benefit Policy Manual, Chapter 15, Section 110.1. 
 
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.