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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.

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.

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:

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. 

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 rule in the Local Coverage Determination (LCD): Lower Limb Prostheses (L33787).

ANKLES

Codes L5968, L5982, L5984, L5986 describe separate products which provide either a single motion or a combination of motions commonly attributed to the anatomic ankle. 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).

L5968 describes a product that is used as an addition to L-code foot systems for lower limb prosthesis construction. The product provides multiaxial motion in the coronal and sagittal plane from articulating components. At transition of stance phase to swing phase, the product will increase the ankle's dorsiflexion angle and maintain it throughout swing phase. The product provides an accommodation of changing heel heights without the user's input. The predicate product is the Rincoe R-Hab Ankle. Use of L5968, L5982, L5984 or L5986 is based on the beneficiary's K-level modifier (K0-K4), as referenced in the LCD.

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.

You can find this rule 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.