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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 Spinal fusion should only be considered as a last step in the treatment of chronic back pain and is not indicated for most persons suffering from back pain. Lumbar spinal fusion surgery may be considered medically necessary and covered for the following indications: 

1. Lumbar spinal instability for ANY of the following indications when confirmed by appropriate diagnostic testing (e.g., radiographic imaging, biopsy, bone aspirate, bone scan and gallium scan): 

Acute spinal fracture 
Progressive or significant acute neurological impairment (e.g., increased weakness or bladder instability) 
Neural compression after spinal fracture 
Epidural compression or vertebral destruction from tumor or abscess 
Spinal tuberculosis 
Spinal debridement for infection (e.g., osteomyelitis) 
Spinal deformity (examples include but not limited to idiopathic scoliosis over 40 degrees, progressive degenerative scoliosis [including spinal levels from the cranial to caudal ends of the deformity and the adjacent normal segment], and sagittal plane deformity + sagittal balance over 10cm) 

2. Spinal stenosis for a single level (for example, L4-L5) with associated spondylolisthesis (see classifications below in section 3) or other documented evidence of instability (for example, facet joint instability [iatrogenic] related to decompression), AND symptoms of spinal claudication and radicular pain. The pain must represent a significant functional impairment despite a history of 3 months of conservative therapy (non-surgical medical management) as clinically appropriate addressing the following: 

Activity lifestyle modification 
Daily exercise 
Supervised physical therapy (PT) (activities of daily living [ADLs] diminished despite completing a plan of care) 
Anti-inflammatory medications, oral or injection therapy as appropriate, and analgesics 

3. Spondylolisthesis manifested by back pain WITH OR WITHOUT spinal claudication, radicular pain, motor deficit when ANY of the following criteria are met: 

Confirmed progressive deformity usually Grade II or higher 
Multilevel spondylolysis 
Symptomatic low-grade spondylolisthesis associated with back pain and significant functional impairment despite a history of 3 months of conservative therapy (non-surgical medical management) as clinically appropriate addressing the following: activity lifestyle modification; daily exercise; supervised PT (ADLs diminished despite completing a plan of care); and anti-inflammatory medications, oral or injection therapy as appropriate, and analgesics 
Classification of slippage in spondylolisthesis is defined as follows: 

Grade I =1% to 25%
Grade II =26% to 50% 
Grade III =51% to 75% 
Grade IV = 76% to 100% 
Grade V = spondyloptosis and occurs when the L5 vertebra completely slides over the top of the sacrum 

4. Degenerative disc disease (DDD) in the absence of instability when all of the following criteria have been met as clinically appropriate for the patient's current episode of care: 

Single level DDD demonstrated on imaging studies (e.g., CT scan, MRI, or discography) as the likely cause of pain. The case specific indications for two level or the rare three or more level planned fusion procedure must be directly addressed in the pre procedure record with clinical correlation to diagnostic testing results (such as disk-space narrowing, end plate changes, annular changes, etc.). 
Pain and significant functional impairment despite a history of at least 6 months of conservative therapy (non-surgical medical management) as clinically appropriate addressing the following: 

Anti-inflammatory medications, oral or injection therapy as appropriate, and analgesics 
Daily exercise 
Activity lifestyle modification 
Weight reduction as appropriate Supervised PT [ADLs diminished despite completing a plan of care] 

OR 

Unsuccessful improvement after completion of intense multidisciplinary rehabilitation (IMR). IMR is defined as onsite program that includes supervised PT, cognitive behavior component, and other coordinated interventions by health care professionals. 
Failure of non-surgical medical management can be historical and does not have to be under the direction of the operating surgeon. 

5. Lumbar fusion following prior spinal surgery for the following: 

Recurrent disc herniation despite clinically appropriate post-operative nonsurgical medical management (post-operative case specific conservative therapy is prescribed as clinically appropriate in addition to documentation of pain and functional impairment). 
Adjacent segment degeneration or disc herniation despite clinically appropriate post-operative nonsurgical medical management (post-operative case specific conservative therapy is prescribed as clinically appropriate in addition to documentation of pain and functional impairment). 
Associated spondylolisthesis (for example anterolisthesis) after prior spinal surgery with ALL the following as clinically appropriate: 
Recurrent symptoms consistent with neurological compromise 
Significant functional impairment 
Neural compression is documented by recent post-operative imaging 
Unsuccessful improvement despite 3 months of clinically appropriate post-operative nonsurgical medical management (post-operative case specific conservative therapy is prescribed as clinically appropriate in addition to documentation of pain and functional impairment) Instability is documented by appropriate imaging 
Patient had some relief of pain symptoms following the prior spinal surgery 

6. Treatment of pseudoarthrosis (i.e., nonunion of prior fusion) at the same level after 12 months from prior surgery and ALL of the following are met (unless imaging demonstrates failed spinal instrumentation [for example, fractured rod or loosened screw]): 

Imaging studies confirm evidence of pseudoarthrosis (e.g., radiographs, CT) 
Unsuccessful improvement despite 3 months of clinically appropriate post-operative nonsurgical medical management (post-operative case specific conservative therapy is prescribed as clinically appropriate in addition to documentation of pain and functional impairment) 
Patient had some relief of pain symptoms following the prior spinal surgery 

Limitations: 

Lumbar spinal fusion for the following conditions is not considered medically necessary and is noncovered: 

When performed with initial primary laminectomy/discectomy for nerve root decompression or spinal stenosis, without documented spondylolisthesis or documentation of instability (e.g., documented intraoperative iatrogenic instability). 
Lumbar fusion at multi-levels (2 or more) for pure DDD unless case specific indications for two level or the rare three or more level planned fusion procedure is directly addressed in the pre-procedure record. 

Any major procedure has significant benefit and risk (injury or death) that the treating physician discusses with the patient. To meet the reasonable and necessary (R&N) threshold for coverage of a procedure, the physician's documentation for the case should clearly support both the diagnostic criteria for the indication (standard test results and/or clinical findings as applicable) and the medical need (the procedure does not exceed the medical need and is at least as beneficial as existing alternatives & the procedure is furnished with accepted standards of medical practice in a setting appropriate for the patient's medical needs and condition). Lacking compelling arguments for an exception in the supporting documentation, the hospital (FISS claim) and physician services (MCS claim) can be denied. If in certain circumstances the patient does not meet all of the required criteria outlined in the local coverage determination (LCD) for a procedure, but the treating physician feels that the procedure is a covered procedure given the current standards of care, then the documentation must clearly outline the patient's episode of care that supports the major procedure and must clearly address the reason(s) for coverage. For example, if clinical findings (or lack of) for an indication are not consistent with the LCD criteria, it should be directly addressed in the pre-procedure documentation. For example, if certain conservative therapies are not necessary for a given patient, it should be directly noted in the pre-procedure documentation. For example, if lumbar fusion for multiple levels for pure DDD is the planned intervention, the pre-procedure documentation should address this debated indication. The clinical judgment of the treating physician is always a consideration if clearly addressed in the pre-procedure record and if consistent with the episode of care for the patient as documented in patient records and claim history. 

The hospital records are the primary source of information for the audit of hospital/procedure services. Therefore, any historical data supporting the medical necessity for the fusion (for example, duration and outcomes of physiotherapy, injection therapy, anatomic factors influencing the decision for surgery, etc.) must be included in the inpatient medical record as noted in the history and physical examination, operative note and/or copies of office notes. For example, fusion of iatrogenic instability (i.e., surgical resection of facet as essential portion of the required decompression rendering an unstable segment) should be documented in a pre-operative note and/or an operative note. 

You can find this information in Medicare's Local Coverage Determination (LCD): Lumbar Spinal Fusion for Instability and Degenerative Disc Conditions (L33382).

If you want to read these Medicare rules, you can go to this website www.medicareappeal.com.