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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 when submitting a prosthetic claim, the billed code for knee, foot, ankle and hip (HCPCS 
codes L5610, L5611, L5613, L5614, L5616, L5710, L5711, L5712, L5714, L5716, L5718, L5722, L5724, 
L5726, L5728, L5780, L5810, L5811, L5812, L5814, L5816, L5818, L5822, L5824, L5826, L5828, L5830, 
L5840, L5848, L5856, L5857, L5858, L5859, L5930, L5961, L5970, L5971, L5972, L5973, L5974, L5975, 
L5976, L5978, L5979, L5980, L5981, L5982, L5984, L5985, L5986, L5987) components must be submitted 
with modifiers K0 - K4, indicating the expected beneficiary functional level. This expectation of functional 
ability information must be clearly documented and retained in the prosthetist's records. The simple entry of a 
K modifier in those records is not sufficient. There must be information about the beneficiarys history and 
current condition which supports the designation of the functional level by the prosthetist. 
 
Addition codes for endoskeletal knee-shin systems are L5610, L5611, L5613, L5616, L5810, L5811, L5812, 
L5814, L5816, L5818, L5822, L5824, L5826, L5828, L5830, L5840 are considered an upgrade to the knee-
shin system. The beneficiary may qualify for an upgraded knee-shin system based on their assigned K-Level 
modifier (K0-K4), as referenced in the LCD. These Healthcare Common Procedure Coding System (HCPCS) 
codes can fully describe a complete prosthetic knee-shin system commonly referred to as a base knee code. 
A single addition code can fully describe a complete knee-shin system and thus the use of two codes (L5610, 
L5611, L5613, L5616, L5810, L5811, L5812, L5814, L5816, L5818, L5822, L5824, L5826, L5828, L5830, 
L5840) would be considered incorrect coding (unbundling). 
 
L5925, L5930, L5845, L5848, L5850, L5856, L5857, L5858, L5859 are additional features and/or functions 
that do not describe a complete endoskeletal knee-shin system and must be used in combination with an L-code 
for a knee-shin system (L5610, L5611, L5613, L5616, L5810, L5811, L5812, L5814, L5816, L5818, L5822, 
L5824, L5826, L5828, L5830, L5840). The use of additional feature L-codes may also depend on the assigned 
K-Level modifier (K0-K4), as referenced in the LCD. 
 
L5856 refers to a feature of an endoskeletal knee component which is incorporated into the entire knee-shin 
system. The microprocessor componentry with sensors, any type, provide automated adjustment for controlling 
the swing and stance phase of gait. This feature would be discernable from schematic drawings and user 
manual documentation. The documentation would provide details for all of the adjustments for the dynamic 
properties of this sub-system within the knee component. Adjustments could factor user characteristics such as 
the activity level, body weight, or gait preferences, among others. This adjustment feature is energized by an 
on-board rechargeable battery source. 
 
You can find these rules in the Local Coverage Article Lower Limb Prostheses - Policy Article A52496. 
 
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.