Selective Dorsal Rhizotomy for Spasticity in Cerebral Palsy
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Clinical coverage criteria governing when selective dorsal rhizotomy (SDR) is considered medically necessary or not for children with spastic cerebral palsy, intended for use by providers and prior authorization reviewers in Ambetter Nevada.
No material clinical or coverage changes in this revision.
Coverage Criteria for Selective Dorsal Rhizotomy (SDR)
Medically necessary criteria for SDR
SDR is medically necessary when ALL of the following are met:
SDR medical necessity criteria
- Spastic diplegia, or spastic quadriplegia with no significant ataxia or dystonia.
- Gross Motor Function Classification System (GMFCS) level II or III.
- Age > 2 to < 10 years.
- Good trunk control and good lower extremity antigravity strength on clinical examination.
- Functional and intellectual ability to participate in physical rehabilitation.
- Failure of or inability to tolerate other conservative treatment (e.g., pharmacotherapy, orthopedic management, physical therapy).
- No botulinum toxin A injection has been given within the last six months.
- No orthopedic surgery within the last year.
- No significant scoliosis.
- Periventricular leukomalacia (PVL) on MRI with no involvement of the thalamus, basal ganglia or cerebellum.
- Reimers index < 40% (no significant femoral head subluxation on pelvic radiograph).
Not medically necessary
Not medically necessary populations
- Selective dorsal rhizotomy is not medically necessary for children with spastic hemiplegia, or ataxic or athetoid spasticity.
Selective dorsal rhizotomy (SDR) is considered not medically necessary for children whose motor subtype is spastic hemiplegia, or for those whose spasticity is characterized as ataxic or athetoid. Requests for SDR in these clinical presentations do not meet the policy's indications for surgical intervention because the procedure's documented benefits and candidate selection criteria apply to other CP subtypes (see medical necessity criteria).
For emphasis in authorization and coverage determinations: SDR is not medically necessary for children with spastic hemiplegia or with ataxic or athetoid spasticity. Such diagnoses should be documented in the clinical record and will be a basis for denial when present as the primary motor subtype.
Coding and Measurement Criteria
Provider Actions, Prior Authorization, and Documentation Requirements
Prior Authorization Required
Prior authorization is required for selective dorsal rhizotomy (SDR). Requests must document that ALL policy medical necessity criteria are met before authorization is granted.
Conservative Therapy Requirement
Documentation must show failure of or intolerance to conservative treatments prior to SDR. Conservative therapies include pharmacotherapy, nerve blocks (e.g., botulinum toxin A or phenol), orthopedic management, and a course of physical and/or occupational therapy with appropriate orthotics or mobility device trials.
- Must document trial and failure or intolerance of relevant therapies (e.g., oral baclofen, benzodiazepines, botulinum toxin/phenol injections) unless clinically contraindicated
- Document duration, response, and reason for discontinuation or inadequate benefit from each conservative modality
- If botulinum toxin A was given, ensure no injection within the last 6 months per policy exclusion
Required Documentation to Support Medical Necessity
Provide the required documentation to support medical necessity for SDR. Include clear clinical and imaging evidence that the member meets all policy criteria for SDR.
- Definitive diagnosis and subtype of cerebral palsy (e.g., spastic diplegia or spastic quadriplegia) — note that SDR is NOT medically necessary for spastic hemiplegia or ataxic/athetoid spasticity
- GMFCS level documented as II or III
- Patient age (must be >2 and <10 years)
- Clinical exam findings: good trunk control and adequate lower extremity antigravity strength
- Functional and cognitive ability to participate in post‑operative physical rehabilitation
- Detailed history of conservative therapy trials (types, dates, duration, outcomes, intolerance or contraindications)
- Imaging: Brain MRI (document presence of periventricular leukomalacia without thalamic, basal ganglia, or cerebellar involvement) and pelvic radiograph with Reimers index < 40%
- Surgical history: no orthopedic surgery within the last year
- Medication/injection history: no botulinum toxin A injection within the last 6 months
- Assessment of scoliosis (document no significant scoliosis)
- Any additional supportive documentation (therapy notes, outcome measures, gait analysis if available)
Not Medically Necessary Populations
Per policy, SDR is considered not medically necessary for certain populations; authorization should be denied when these exclusions apply.
- Requests for SDR for children with spastic hemiplegia
- Requests for SDR for children with ataxic or athetoid spasticity
Definitions
Background
Selective dorsal rhizotomy (SDR) is a neurosurgical procedure that reduces lower‑extremity spasticity by selectively dividing lumbosacral sensory (afferent) rootlets under intraoperative neurophysiological guidance. Technical approaches have evolved from multilevel laminoplasty to less invasive single‑level laminotomy techniques. In appropriately selected children—primarily ambulatory patients typically younger than eight years with GMFCS level II–III—SDR combined with postoperative physical therapy has shown modest improvements in spasticity and motor function. The policy requires specific candidate characteristics (for example, spastic diplegia or quadriplegia without significant ataxia/dystonia, age >2 to <10 years, good trunk control and lower‑extremity antigravity strength, and imaging and hip stability criteria) to support medical necessity for SDR.
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