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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 a determination of the medical necessity for certain components/additions to the prosthesis 
is based on the beneficiary's potential functional abilities. Potential functional ability is based on the reasonable 
expectations of the prosthetist, and treating practitioner, considering factors including, but not limited to: 
 
The beneficiary's past history (including prior prosthetic use if applicable); and 
 
The beneficiary's current condition including the status of the residual limb and the nature of other medical 
problems; and  The beneficiary's desire to ambulate. 
 
Clinical assessments of beneficiary rehabilitation potential must be based on the following classification levels: 
 
Level 0: Does not have the ability or potential to ambulate or transfer safely with or without assistance and a 
prosthesis does not enhance their quality of life or mobility. 
 
Level 1: Has the ability or potential to use a prosthesis for transfers or ambulation on level surfaces at fixed 
cadence. Typical of the limited and unlimited household ambulator. 
 
Level 2: Has the ability or potential for ambulation with the ability to traverse low level environmental barriers 
such as curbs, stairs or uneven surfaces. Typical of the limited community ambulator. 
 
Level 3: Has the ability or potential for ambulation with variable cadence. Typical of the community ambulator 
who has the ability to traverse most environmental barriers and may have vocational, therapeutic, or exercise 
activity that demands prosthetic utilization beyond simple locomotion. 
 
When an initial below knee prosthesis (L5500) or a preparatory below knee prosthesis (L5510, L5520,L5530, 
L5540) is provided, prosthetic substitutions and/or additions of procedures and components are covered in 
accordance with the functional level assessment except for codes L5629, L5638, L5639, L5646, L5647, L5704, 
L5785, L5962, and L5980 which will be denied as not reasonable and necessary. When a below knee 
preparatory prefabricated prosthesis (L5535) is provided, prosthetic substitutions and/or additions of 
procedures are covered in accordance with the functional level assessment except for codes L5620, L5629, 
L5645, L5646, L5670, L5676, L5704, and L5962 which will be denied as not reasonable and necessary. 
 
A microprocessor controlled ankle foot system (L5973), energy storing foot (L5976), dynamic response foot 
with multi-axial ankle (L5979), flex foot system (L5980), flex-walk system or equal (L5981), or shank foot 
system with vertical loading pylon (L5987) is covered for beneficiaries whose functional level is 3 or above. 
 
An axial rotation unit (L5982, L5984, L5985, L5986) is covered for beneficiaries whose functional level is 2 or 
above. 
 
You can find this information in the Local Coverage Determination (LCD) Lower Limb Prostheses L33787. 
 
If you want to read these Medicare rules, you can go to this website www.medicareappeal.com.