Continuous Passive Motion (CPM) Devices — Coverage Criteria
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This policy defines coverage, limitations, and billing/documentation requirements for continuous passive motion devices used as an adjunct to physical therapy for joint rehabilitation, with separate rules for Medicare and non‑Medicare members.
No material clinical or coverage changes in this revision.
Coverage Criteria
Medicare Member Coverage
For Medicare members: Covered only when ALL of the following are met
Claims for items that do not meet these criteria will be denied as not reasonable and necessary.
Non‑Medicare Member Coverage
For Non‑Medicare members: Considered established therapy when used as an adjunct to conventional physical therapy in early postoperative rehabilitation and meeting at least ONE of the following
Use of continuous passive motion (CPM) machines for joints other than the knee is considered not reasonable and necessary and therefore not covered. This exclusion specifically applies to CPM use for other joint conditions including, but not limited to, the hip, ankles, toes, and fingers.
Synthetic sheepskin pad (HCPCS E0188) and lambswool sheepskin pad (HCPCS E0189) are considered included in the reimbursement for rental of the CPM device and are not separately payable.
Policy change: wording was added to clarify that the use of CPM devices for joints other than the knee would be considered not covered.
For Medicare members, CPM use after any knee or joint surgery other than a total knee replacement or a revision of a major component of a previously performed total knee replacement is not covered. In other words, CPMs are eligible for Medicare coverage only when initiated after a qualifying total knee replacement or qualifying major-component revision.
Durable medical equipment definition note: equipment that is used primarily and customarily for a non-medical purpose is not considered DMEPOS. Policy history: this policy and its history reflect determinations about scope of coverage for CPM devices, including prior clarifications that use for joints other than the knee is not considered covered.
Coding and Billing
| E0935 | Continuous passive motion exercise device for use on knee only |
| E0936 | Continuous passive motion exercise device for use other than knee |
| E0188 | Synthetic sheepskin pad |
| E0189 | Lambswool sheepskin pad, any size |
| 27447 | Example CPT cited for total knee replacement |
| 27486 | Example CPT cited for surgical procedure (cited in documentation requirements) |
| 27487 | Example CPT cited for surgical procedure (cited in documentation requirements) |
Provider Actions, Documentation & Denial Risk
Coverage requirements (Medicare and Non‑Medicare)
For Medicare members, CPMs are covered only when all Medicare criteria are met: started after a total knee replacement or revision of a major component, applied within 48 hours of surgery, and limited to 21 days from the date of surgery and only for the portion during which the device is used in the patient’s home. For non‑Medicare members, CPM is considered established therapy when ordered by the treating practitioner as an adjunct to conventional physical therapy in early postoperative rehabilitation (e.g., knee or shoulder indications listed in policy).
- Medicare timing: must be applied within 48 hours of surgery
- Medicare duration limit: coverage limited to 21 days from date of surgery and only for days used in the member’s home
- Medicare surgical indication: total knee replacement or revision of a major component
- Non‑Medicare: ordered by treating practitioner and used as adjunct to conventional physical therapy in early postoperative rehab
Case‑by‑case coverage determination
Coverage determinations are made on a case‑by‑case basis and are subject to the member’s contract terms and medical necessity requirements; a finding that a product is reasonable and necessary does not itself guarantee coverage under the member’s contract.
Therapy sequencing
CPM is described as an adjunct to conventional physical therapy in the early postoperative rehabilitation phase; the policy does not establish any step‑therapy sequencing requirements or pre‑requisite therapies.
- CPM is an adjunct to conventional physical therapy in early postoperative rehab
- No step‑therapy sequencing instructions provided in policy
Policy note
(No additional summary provided in source.)
Required claim documentation
When billing for a CPM device, claims must include the type of surgery performed (or the CPT code for the surgical procedure — e.g., 27447, 27486, 27487), the date of surgery, the date the device was initiated (the 'from' date when device began in the member’s home), and the date of discharge to home (or the date the member went home if discharged to a facility first). Units must reflect the actual calendar days the device was used in the home and the 'to' date should be the date device use ends.
Rejection risk for incomplete claims
Claims submitted without the required documentation (type/CPT of surgery, surgery date, device initiation date, discharge/home date, and proper 'from'/'to' dates and units) will be rejected.
Final benefit determinations governed by contract
Final benefit determinations are based on the applicable contract language; medical policy guidelines do not override the member’s contract and the contract governs whether a reasonable and necessary product is covered, excluded, or limited.
Denial triggers for Medicare members
For Medicare members, claims that do not meet Medicare criteria may be denied as not reasonable and necessary — examples include devices not applied within 48 hours of surgery, devices used for surgeries other than total knee replacement or major component revision, or device use exceeding the 21‑day coverage period or not used in the member’s home.
Contract and medical necessity caveat
Coverage determinations are subject to the terms, conditions, limitations, and exclusions of the member’s contract, including medical necessity requirements; a determination that a product is reasonable and necessary does not itself constitute coverage under the member’s contract.
Background
A continuous passive motion (CPM) device is an electrically powered device that moves the affected joint continuously without the patient's active effort. It is used as an adjunct to conventional physical therapy during the early postoperative rehabilitation period, with settings such as range of motion and speed adjusted by qualified clinicians and an emergency stop available.
Definitions
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