Facet joint interventions covered include diagnostic and therapeutic intraarticular (IA) facet joint injections, medial branch blocks (MBB), radiofrequency ablations (RFA), and facet cyst rupture/aspiration. Coverage context is defined by the Local Coverage Determination (LCD) L38773 (version 30) and CMS Article A58364 (version 32). Procedures must be performed with CT or fluoroscopic image guidance; ultrasound, MRI, or unguided injections are not covered. Relevant CPT codes include 64490-64495 (facet injections), 64633-64636 (facet joint nerve neurolytic destruction), and designated modifiers for bilateral procedures (-50). The KX modifier is required on diagnostic injection claims.

Covered ICD-10 diagnoses support chronic moderate to severe axial neck or low back pain lasting at least 3 months, with pain scales and disability assessments documented at baseline and after procedures. There must be documented failure or intolerance to noninvasive conservative management. Absence of untreated radiculopathy or neurogenic claudication is required except radiculopathy caused by facet joint synovial cyst. Imaging must exclude alternate non-facet pathology such as fracture, tumor, infection, or significant deformity.

Medical necessity for diagnostic procedures requires intent to use results to guide RFA treatment. A second confirmatory diagnostic block at the same level is allowed after a minimum 2-week interval, documenting at least 80% pain relief from the first procedure. Frequency limits for diagnostic blocks are no more than four sessions per spinal region in any 12-month rolling period. Therapeutic injections require prior successful diagnostic blocks (each with ≥80% relief), with subsequent therapeutic injections demonstrating at least 50% consistent pain relief or functional improvement lasting at least 3 months. Therapeutic facet joint procedures are limited to four sessions per spinal region per 12 months.

Facet joint denervation (RFA) coverage requires at least two diagnostic MBBs with documented 80% pain relief. Repeat RFA may be performed if there is consistent ≥50% pain relief or functional improvement for at least 6 months. Frequency is limited to two RFA sessions per spinal region per rolling 12 months.

Facet cyst aspiration/rupture is covered when advanced imaging confirms nerve root compression or displacement by cyst and symptoms correlate. Frequency is limited to one repeat aspiration per cyst if ≥50% pain relief is obtained for at least 3 months.

One to two facet levels per spinal region, unilateral or bilateral, are allowed per session; procedures that involve three or more levels per session are noncovered. Bilateral procedures must use modifier 50 for physician billing; ambulatory surgery centers report separate lines with RT and LT modifiers. Multiple types of blocks on the same day are generally not recommended unless clearly documented for medical necessity.

Moderate or deep sedation, general anesthesia, and monitored anesthesia care (MAC) are not routinely covered for facet injections. Sedation may be considered for RFA or cyst aspiration only with strong medical necessity documentation due to patient inability to cooperate or medical contraindications. Anxiety or patient preference alone does not justify sedation.

Noncovered services and denial risk factors include intraarticular and extraarticular prolotherapy, non-thermal denervation techniques such as chemical neurolysis or pulsed radiofrequency, intra-facet implants, procedures after anterior lumbar interbody fusion (ALIF), diagnostic injections at levels previously successfully treated by RFA, and procedures performed without required image guidance.

Documentation must include detailed assessment related to the patient’s complaint, relevant history, test and procedure results, signed and dated office or operative notes, and consistent use of accepted pain and disability scales (e.g., NRS, VAS, Oswestry Disability Index). Claims lacking valid ICD-10 diagnosis codes will be returned as incomplete.

Providers must be appropriately trained and credentialed, with proficiency in anatomy, pharmacodynamics, diagnostic and procedural techniques, and use of imaging. Non-physician practitioners must operate within state scope of practice. Providers should consult AMA CPT guidelines and CMS National Correct Coding Initiative (NCCI) and OPPS packaging edits before billing.

Summary references: CMS Medicare Benefit Policy Manual Pub 100-02 Chapter 15 Section 50; Medicare NCD Manual Pub 100-03 Sections 30.3, 150.7, 220.1; Medicare Claims Processing Manual Pub 100-04 Chapters 13 Sections 10.1 and 20; Medicare Program Integrity Manual Pub 100-08 Chapter 13 Section 13.5.4; LCD L38773 Version 30; Article A58364 Version 32.

Not clearly stated in source: Specific minimum documentation requirements for conservative care progression details; exact imaging modality preferences beyond CT/fluoroscopy; precise definition of “functional deficit” scale threshold.