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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 (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 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. The code would include any external components needed to access the 
microprocessor for modification of the settings. 
 
Codes L5968, L5982, L5984, L5985, L5986 and L5988 describe separate products which provide either a 
single motion or a combination of motions generally attributed to functional movement of the lower limb 
during ambulation. The use of these codes can be used to fully describe additional features or functions not 
found in the prosthetic foot system (L5969, L5970, L5971, L5972, L5973, L5974, L5975, L5976, L5978, 
L5979 L5980, L5981 and L5987). 
 
Addition codes for lower extremity prostheses, L5970, L5971, L5972, L5974, L5975, L5976, L5978, L5979, 
L5980, L5981, L5987 are considered an upgrade to the SACH foot. The beneficiary may qualify for an 
upgraded prosthetic foot based on their assigned K-level modifier (K0-K4) as referenced in the LCD. A single 
addition code (L5970, L5971, L5972, L5974, L5975, L5976, L5978, L5979, L5980, L5981, L5987) can fully 
describe a complete foot and thus the use of more than one code would be considered incorrect coding 
(unbundling). 
 
L5968, L5982, L5984, L5985, L5986, L5988, L5990 are additional features and/or functions that do not 
describe a complete prosthetic foot and may be used in combination with L5970, L5971, L5972, L5974, 
L5975, L5976, L5978, L5979, L5980, L5981, and L5987. The use of additional feature L-codes may also 
depend on the assigned K-Level modifier (K0-K4) as referenced in the LCD. 
 
L5980 describes a product that can be used for either endoskeletal or exoskeletal lower limb construction. The 
Flex Foot has an energy storing J-shaped keel design. Heel component is attached onto the J-shaped keel 
section. The Flex Foot Systems J-shaped keel design extends proximally as a monolithic composite shank. 
Shank height is determined and modified by supplier to utilize the dynamics of the composite shank. L5980 
includes foot cover. 
 
L5981 describes a product that can be used for either endoskeletal or exoskeletal lower limb construction. The 
Flex Walk has an energy storing J-shaped keel design. Heel component is attached to the J-shaped keel section. 
The Flex Walk J-shaped keel design proximally terminates at a nonadjustable fixed height determined and 
modified by the prosthetic foot manufacturer. L5981 includes foot cover. 
 
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.