Blue Cross NC Facet Joint Injection / Medial Branch Block prior authorization requirements (2026)

Medical-necessity criteria Blue Cross NC generally applies

Diagnostic Medial Branch Blocks with Local Anesthetic - "The primary utility of medial branch blocks (MBB) is to determine the suitability of the patient for a radiofrequency neurotomy of painful segmental levels in order to achieve long-term pain management. A positive response is defined as at least 80% relief of the primary (index) pain, with the onset and duration of relief being consistent with the agent employed." "The patient must be experiencing pain at the time of the injection (generally rated at least 3 out of 10 in intensity) ... Diagnostic medial branch blocks are to be performed with local anesthetic agents only. The concurrent use of steroids is not medically necessary." "Dual medial branch blocks, defined as injections performed in the same location(s) on two separate occasions at least one week apart, are necessary to confirm the diagnosis ... A confirmatory injection is considered medically necessary only if the first injection results in a positive response (defined as at least 80% or more relief in primary pain index)." Therapeutic Intraarticular Facet Joint Injections - "are generally considered not medically necessary for facetogenic axial low back pain. The preferred approach is thermal radiofrequency nerve ablation after positive dual diagnostic medial branch blocks." They "may be considered medically necessary when ALL Patient Requirements for facet injections are met AND ANY of the following conditions (1-3) are documented: There is suspected inflammatory facetogenic pain due to systemic inflammatory arthropathies clearly documented in the patient's history and assessment (e.g., rheumatoid arthritis); Denervation is contraindicated (e.g., young person ...; pacemaker-dependent patients ...); Evidence of nerve root compression due to a facet synovial cyst or large effusion" on MRI/CT within 12 months with moderate-to-severe radicular pain. [NEEDS CLINICAL SPOT-CHECK]

Commonly required documentation

• Pre- and post-procedure pain scores and provocative-maneuver findings for each diagnostic block
• documentation that local anesthetic only was used
• for therapeutic IA injections, the qualifying condition (inflammatory arthropathy, denervation contraindication, or synovial cyst on MRI/CT within 12 months)
• planned surgery or surgical consultation where a pars defect is the suspected generator.

Situations to verify before submitting

Blue Cross NC may not cover Facet Joint Injection / Medial Branch Block in these situations. Verify against the current policy rather than assuming a denial:

• {"text":"Exclusions: \"Diagnostic medial branch block at the same level as a previously successful radiofrequency ablation (RFA) procedure (exception: 2 years or more since the last RFA ...); Diagnostic intraarticular facet joint injection; Diagnostic medial branch blocks for reasons other than candidacy for RFA; Therapeutic medial branch block (use of corticosteroid with diagnostic medial branch block); Therapeutic intraarticular facet joint injection for any other indication not listed above; Diagnostic or therapeutic intraarticular injection, medial branch block, or RFA in the thoracic region with the exception of C7-T1 and T12-L1; ... Any facet joint interventions performed under ultrasound guidance; Intraarticular or extraarticular facet joint prolotherapy, or platelet-rich plasma injection; Facet joint procedures in more than one spinal region in a single session.\"","source":"https://guidelines.carelonmedicalbenefitsmanagement.com/interventional-pain-management-2026-06-14/"}

How to submit

• Method: Prior authorization is delegated to Carelon Medical Benefits Management for spine surgery, joint surgery, interventional pain management, and small joint surgery (Commercial Fully Insured since 2023-10-01; ASO groups only if the group elected the program, effective 2025-01-01 - verify by member ID on the Carelon portal or via the number on the member ID card). Submit through the Carelon Provider Portal via Blue e (24/7, real-time against Carelon clinical guidelines) or by phone at 866-455-8414, Monday-Friday 8 a.m.-6 p.m. ET. Applies in both outpatient and inpatient admission settings. Since 2025-07-01 (Fully Insured only; excludes Medicare Advantage, DSNP, EGWP, FEP and ASO), a request for a hospital-based OUTPATIENT setting for interventional pain or joint-arthroscopy/small-joint procedures gets an additional site-of-care review.
• Portal: Carelon Provider Portal (via Blue e)
• Typical turnaround: about 3 days

Sources & verification

• BindingSource - Carelon Clinical Appropriateness Guidelines: Interventional Pain Management (Interventional Pain Management 2026-06-14) · effective 2026-06-14.View
• BindingSource - Blue Cross NC Musculoskeletal Program and Interventional Pain Management effective October 1, 2023 (Carelon delegation) (Provider news 2023-10-01) · effective 2023-10-01.View

Binding = the payer's own policy. Proxy = a public, evidence-based clinical guideline the payer mirrors. Portal-only = the binding criteria are confirmed in the administrator's portal. Always confirm against the payer for the member's specific plan. Last verified 2026-09-20.

Frequently asked questions

Other Blue Cross NC prior authorization requirements

Related guides