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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 Facet Joint Interventions generally consist of four types of procedures: Intraarticular (IA) Facet Joint Injections, Medial Branch Blocks (MBB), Radiofrequency Ablations (RFA) and Facet cyst rupture/aspiration: Facet Joint Interventions are considered medically reasonable and necessary for the diagnosis and treatment of chronic pain in patients who meet ALL the following criteria: 
1. Moderate to severe chronic neck or low back pain, predominantly axial, that causes functional deficit measured on pain or disability scale* 
2. Pain present for minimum of 3 months with documented failure to respond to noninvasive conservative management (as tolerated) 
3. Absence of untreated radiculopathy or neurogenic claudication (except for radiculopathy caused by facet joint synovial cyst) 4. There is no non-facet pathology per clinical assessment or radiology studies that could explain the source of the patient's pain, including but not limited to fracture, tumor, infection, or significant deformity. 
*Pain assessment must be performed and documented at baseline, after each diagnostic procedure using the same pain scale for each assessment. A disability scale must also be obtained at baseline to be used for functional assessment (if patient qualifies for treatment). 
A. Diagnostic Facet Joint Procedures (IA or MBB): 
The primary indication of a diagnostic facet joint procedure is to diagnose whether the patient has facet syndrome. Intraarticular (IA) facet block(s) are considered reasonable and necessary as a diagnostic test only if medial branch blocks (MMB) cannot be performed due to specific documented anatomic restrictions or there is an indication to proceed with therapeutic intraarticular injections. These restrictions must be clearly documented in the medical record and made available upon request.
Diagnostic procedures should be performed with the intent that if successful, radiofrequency ablation (RFA) procedure would be considered the primary treatment goal at the diagnosed level(s). 
A second diagnostic facet procedure is considered medically necessary to confirm validity of the initial diagnostic facet procedure when administered at the same level. The second diagnostic procedure may only be performed a minimum of 2 weeks after the initial diagnostic procedure. Clinical circumstances that necessitate an exception to the two-week duration may be considered on an individual basis and must be clearly documented in the medical record. 
For the first diagnostic facet joint procedure: 
a. For the first diagnostic facet joint procedure to be considered medically reasonable and necessary, the patient must meet the criteria outlined under indications for facet joint interventions. 
b. A second confirmatory diagnostic facet joint procedure is considered medically reasonable and necessary in patients who meet ALL the following criteria: 
i. The patient meets the criteria for the first diagnostic procedure; AND 
ii. After the first diagnostic facet joint procedure, there must be a consistent positive response of at least 80% relief of primary (index) pain (with the duration of relief being consistent with the agent used) 
Frequency limitation: For each covered spinal region no more than four (4) diagnostic joint sessions will be reimbursed per rolling 12 months, in recognition that the pain generator cannot always be identified with the initial and confirmatory diagnostic procedure. 
B. Therapeutic Facet Joint Procedures (IA): 
Therapeutic facet joint procedures are considered medically reasonable and necessary for patients who meet ALL the following criteria: 
a. The patient has had two (2) medically reasonable and necessary diagnostic facet joint procedures with each one providing a consistent minimum of 80% relief of primary (index) pain (with the duration of relief being consistent with the agent used); AND b. Subsequent therapeutic facet joint procedures at the same anatomic site results in at least consistent 50% pain relief for at least three (3) months from the prior therapeutic procedure or at least 50% consistent improvement in the ability to perform previously painful movements and ADLs as compared to baseline measurement using the same scale; AND 
c. Documentation of why the patient is not a candidate for radiofrequency ablation (such as established spinal pseudarthrosis, implanted electrical device). 
Frequency Limitations: For each covered spinal region no more than four (4) therapeutic facet joint (IA) sessions will be reimbursed per rolling 12 months. 
You can find this information in the Local Coverage Determination (LCD) L34892.
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.