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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 a lower limb prosthesis is covered when the beneficiary:
1. Will reach or maintain a defined functional state within a reasonable period of time; and
2. Is motivated to ambulate.
FUNCTIONAL LEVELS:
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:
1. The beneficiary's past history (including prior prosthetic use if applicable); and
2. The beneficiary's current condition including the status of the residual limb and the nature of other
medical problems; and
3. 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.
Level 4: Has the ability or potential for prosthetic ambulation that exceeds basic ambulation skills, exhibiting
high impact, stress, or energy levels. Typical of the prosthetic demands of the child, active adult, or athlete.
The records must document the beneficiary's current functional capabilities and his/her expected functional
potential, including an explanation for the difference, if that is the case. It is recognized, within the functional
classification hierarchy, that bilateral amputees often cannot be strictly bound by functional level
classifications.
You can find this in the Medicare Local Coverage Determination (LCD) Lower Limb Prostheses (L33787).
The rules say that the reasonable useful lifetime of durable medical equipment is determined through program
instructions. In the absence of program instructions, carriers may determine the reasonable useful lifetime of
equipment, but in no case can it be less than 5 years. This is seen in the Medicare Benefit Policy Manual
Chapter 15 under Covered Medical and Other Services Section 110.2.
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.