Prior authorization required for initial and second diagnostic blocks

Initial and second diagnostic facet joint injections/medial branch nerve blocks submitted for authorization must include documentation that all coverage criteria are met (see clinical criteria for initial and second diagnostic blocks).

• Initial diagnostic block: documentation that pain is predominantly axial (C2-3 to L5-S1), duration ≥3 months, and ≥4 weeks of conservative care in prior 3 months or documented contraindication
• Second diagnostic block: administered at same level(s) as initial block and intended to confirm validity of the initial positive response

Prior authorization when therapeutic injection used instead of RFA

When therapeutic facet joint/medial branch injections are proposed as an alternative to radiofrequency ablation, prior authorization must document that the individual is not a candidate for RFA (specific contraindications) and that criteria for therapeutic alternative are met.

• Document a contraindication to RFA such as established spinal pseudoarthrosis at the intended level or presence of an implanted electrical device (e.g., pacemaker, defibrillator, dorsal column stimulator, DRG stimulator, peripheral neurostimulator, cranial neurostimulator, implantable programmable drug pump)
• Provide documentation of two sequential diagnostic blocks at the same level(s) showing positive response (≥80% relief for expected anesthetic duration)

Limit of two diagnostic injections at same level(s)

Only two diagnostic facet joint injections/medial branch nerve blocks are permitted at the same level(s); prior response(s) must be documented before requesting additional diagnostic procedures at the same level.

• More than two injections at the same level/side are considered therapeutic rather than diagnostic and must meet therapeutic criteria
• Authorization requests for additional diagnostic injections at the same level should include documentation of prior responses

Prior authorization may be required for listed CPT codes

CPT codes for facet joint/medial branch injections are listed in the policy and coverage may be subject to product-specific prior authorization processes; use the codes appropriate to guidance modality and levels treated when requesting authorization.

• Codes include 0213T–0218T (ultrasound E/I) and 64490–64495 (image guidance fluoroscopy/CT); product coverage may determine whether medical policy criteria apply

Therapeutic blocks allowed only if RFA is contraindicated

Therapeutic facet joint/medial branch blocks will be considered only when radiofrequency ablation/neurotomy is contraindicated and that contraindication is documented.

• Examples of contraindications that must be documented: established spinal pseudoarthrosis at the intended level or implanted electrical devices

Therapeutic alternative requires two sequential positive diagnostic blocks

Therapeutic injections as an alternative to RFA are permitted only after two sequential diagnostic blocks at the same level(s) demonstrating a positive response (defined by policy).

• A positive response is evidenced by at least 80% relief of facet‑mediated pain for at least the expected minimum duration of the local anesthetic
• Documentation of both sequential positive diagnostic blocks at the same level(s) must be included with the authorization request

Second diagnostic injection only if it will change management (RFA consideration)

A second diagnostic injection should be performed only when a successful result would lead to consideration of radiofrequency denervation/ablation at the diagnosed level(s).

• Intent to proceed to RFA if diagnostic is positive must be documented when requesting a second diagnostic block

Conservative treatment trial and documentation

Guideline-recommended conservative treatment should be documented; a 3-month trial of different conservative treatments is recommended before facet joint interventions.

• If conservative treatment is contraindicated, the reason(s) must be documented
• Policy also requires at least four weeks of appropriate conservative treatment in the prior three months (see initial diagnostic criteria)

Document level(s) treated and diagnostic response (≥80% relief)

Authorization requests must document the level(s) treated and the degree of pain relief after the initial diagnostic injection; a positive response is defined as at least 80% relief for the expected anesthetic duration.

• Document treated level(s) and the percent pain relief and expected duration of relief following the initial diagnostic block
• Second diagnostic block must be administered at the same level(s) as the initial block

Document two sequential positive diagnostic blocks for therapeutic alternative

When using therapeutic injections as an alternative to RFA, include documentation of two sequential diagnostic blocks at the same level(s) showing a positive response (≥80% relief for the expected anesthetic duration).

• Policy requires documentation that both sequential diagnostic blocks produced at least 80% relief for at least the expected minimum duration of the local anesthetic
• Include clinical notes demonstrating timing and measured pain relief for each diagnostic block

Synovial cyst aspiration requires advanced imaging and clinical correlation

When performing a facet joint injection with synovial cyst aspiration, provide advanced imaging (MRI, CT, or CT myelogram) confirming compression or displacement of the corresponding nerve root by the cyst and clinical correlation with radicular signs/symptoms.

• Include the diagnostic imaging study demonstrating nerve root compression/displacement by the synovial cyst
• Provide clinical correlation (history and physical exam) showing signs/symptoms of radicular pain or radiculopathy

Documentation required for repeat therapeutic injections (≥50% relief ≥12 weeks)

For repeat therapeutic facet joint injections/medial branch blocks, document that the prior injection produced ≥50% pain relief for at least 12 weeks before approving another therapeutic injection.

• Document magnitude of prior benefit (≥50%) and duration (≥12 weeks)
• Also confirm minimum interval of six months from the prior therapeutic injection when applicable

Required documentation: intent and prior injection responses (≥80% diagnostic response)

Authorization requests must clearly state the intent (diagnostic vs therapeutic), prior injection responses (positive response defined as ≥80% relief for expected anesthetic duration), and, when applicable, consideration of radiofrequency denervation if diagnostic block is successful.

• State whether the current request is diagnostic or therapeutic
• Provide documentation of prior injection responses; define positive diagnostic response as ≥80% relief for expected anesthetic duration
• When requesting injections contiguous to a fused segment, document prior negative blocks at the requested level if applicable

Documentation standard for diagnostic response (≥80% relief for expected duration)

Documented response to a diagnostic facet joint injection/medial branch block must be at least 80% relief of facet-mediated pain for at least the expected minimum duration of the local anesthetic; responses to the first two injections must be recorded.

• Record percent pain relief and the duration of relief consistent with the anesthetic used
• Ensure documentation shows the response to the first two diagnostic injections

Denial risk triggers and common denial reasons

Requests lacking documentation of at least four weeks of conservative treatment within the prior three months, procedures performed on more than three facet joint levels in the same session, performance on >3 contiguous levels, same-day invasive procedures without the allowed exception, or without required imaging guidance are at risk for denial.

• Missing documentation of ≥4 weeks conservative care in prior 3 months may trigger denial
• Injecting more than three facet joint levels in one session or >3 contiguous levels may be denied (exceptions for contiguous to posterior fusion apply)
• Same-day invasive procedures will be denied except the TFESI with synovial cyst aspiration exception
• Procedures performed without fluoroscopic or CT guidance are considered not medically necessary and may be denied

Imaging guidance required (fluoroscopy or CT)

Facet joint injections/medial branch nerve blocks performed without fluoroscopic or CT guidance are considered not medically necessary; authorization requests without image guidance documentation should be denied.

• Fluoroscopy or CT guidance must be documented for procedures; ultrasound guidance is listed as investigational in the policy

Same‑day invasive procedure restriction (denial risk)

Requests for facet joint injection or medial branch nerve block performed on the same day as another invasive procedure will be denied except when the facet injection is performed with a TFESI for synovial cyst aspiration (allowed exception).

• If same-day procedures are proposed, include justification and confirm whether the synovial cyst aspiration/TFESI exception applies

Contiguous level limit: >3 contiguous levels at risk for denial

Requests for procedures performed on more than three contiguous spinal levels are considered not medically necessary and may be denied; include documentation if the requested levels are contiguous with a posterior spinal fusion segment to support an exception.

• If requesting >3 contiguous levels, provide documentation that levels are contiguous with a posteriorly fused spinal motion segment to qualify for exception

Post‑ablation diagnostic injections are not routinely allowed

Additional diagnostic injections after a prior successful radiofrequency denervation/ablation at the requested level are considered not medically necessary and are at risk for denial.

• Provide documentation if prior RFA occurred and rationale if requesting additional diagnostic blocks at that level

Additional denial triggers and scheduling restrictions

Claims may be denied if procedures are performed above C2‑C3 or below L5‑S1, are scheduled as a series without evaluation of prior response, or when therapeutic injections are requested subsequent to the initial two diagnostic injections unless RFA is contraindicated.

• Procedures above C2‑C3 or below L5‑S1 are not medically necessary per policy
• Therapeutic injections after the initial two diagnostics are only allowed when RFA is contraindicated; otherwise at risk for denial
• Requests presenting series of injections without prior response data should include evaluation of prior injection outcomes to avoid denial

Verify contract/product coverage before authorization

Services are contract dependent; if a product does not cover a service, medical policy criteria do not apply and lack of product coverage may trigger denial.

• Verify product-level coverage before submitting authorization; if the product does not cover the service, do not rely on policy criteria to override product exclusions

Obtain imaging to exclude other causes before diagnostic injection

Clinical findings and imaging studies must suggest no other obvious cause of axial pain prior to diagnostic facet joint injection; imaging to exclude other causes is required.

MRI/CT/CT myelogram required for synovial cyst aspiration

Facet joint injection with synovial cyst aspiration requires advanced diagnostic imaging (MRI, CT, or CT myelogram) confirming compression or displacement of the corresponding nerve root and clinical correlation.

Use fluoroscopy or CT guidance for facet injections/MBB

Facet joint injections and medial branch nerve blocks must be performed with fluoroscopic or CT guidance.

Fluoroscopy is standard; ultrasound guidance is investigational

The policy treats fluoroscopic guidance as the expected standard and considers ultrasound guidance investigational (not acceptable per policy).

Select CPT code matching the image guidance modality used

Some listed CPT codes describe procedures with fluoroscopy/CT guidance and others with ultrasound guidance; use the code that corresponds to the guidance modality used when billing.

• Image-guided codes: 64490–64495 for fluoroscopy/CT; 0213T–0218T denote ultrasound E/I designations.