ModifiedUnitedHealthcarePolicy CS178PA.G

Facet Joint and Medial Branch Block Injections for Spinal Pain (for Pennsylvania Only)

Medical policy governing diagnostic and therapeutic facet joint injections and medial branch blocks for spinal pain in Pennsylvania; applies to Pennsylvania Community Plan requests and outlines medical necessity, exclusions, and coding guidance.

Policy Summary

PayerUnitedHealthcare

PolicyFacet Joint and Medial Branch Block Injections for Spinal Pain (for Pennsylvania Only)

Policy CodePolicy CS178PA.G

Change TypeClarified unproven/NOT medically necessary indications; added reimbursement reference

Effective DateFeb 1, 2026

Next Review Date

Key ActionObtain and document a minimum of four weeks of conservative therapy and prior authorization for listed procedure codes when billing for Pennsylvania members.

SourceLink

POLICY UPDATE CHANGES

Added language to clarify the listed circumstances are unproven and not medically necessary for Facet Joint Injections/Medial Branch Blocks due to insufficient evidence of efficacy.

Added reference link to the Reimbursement Policy titled Anesthesia Policy, Professional.

Updated Clinical Evidence and References sections to reflect current information.

Archived previous policy version CS178PA.F.

>=50%diagnostic positive threshold

4 weeksminimum conservative care

0.5 mlmax anesthetic volume

0213T–0218T, 64490–64495procedure codes listed

3–6 monthstypical follow-up

Coverage Criteria for Facet Joint and Medial Branch Injections

inv-01: Initial Diagnostic Injection

Covered when ALL of the following are met:

Initial diagnostic block criteria: Pain is exacerbated by facet-loading maneuvers on physical examination (e.g., hyperextension, rotation); and clinically significant improvement has not occurred (pain >=3/10) after a minimum of four weeks of conservative care (including but not limited to pharmacotherapy, exercise, or physical therapy); and clinical findings and imaging studies suggest no other cause of the pain (e.g., spinal stenosis with neurogenic claudication, disc herniation with radicular pain, infection, tumor, fracture, pain related to prior surgery); and the spinal motion segment is not fused; and a radiofrequency joint denervation/ablation procedure is being considered.

inv-02: Confirmatory Diagnostic Injection

A second diagnostic Facet Joint Injection/Medial Branch Block to confirm the initial response is covered when ALL of the following are met:

Second diagnostic block criteria: Administered at the same level and side as the initial block; and the initial diagnostic injection produced a positive response demonstrated by at least the expected minimum duration of the effect of the local anesthetic and functional improvement specific to the individual with demonstrable improvement in the physical functions previously limited by the facetogenic pain; and a radiofrequency joint denervation/ablation procedure is being considered.

inv-03: Coverage criteria — diagnostic vs therapeutic

Coverage stance and criteria reflect mixed evidence; include diagnostic uses with specific confirmatory requirements and limited support for therapeutic injections.

Diagnostic medial branch blocks - confirmation: Dual (two) diagnostic medial branch blocks are necessary to confirm facet-mediated pain due to high false-positive rates; a confirmatory block is indicated only if the first injection produces ≥80% relief and the onset/duration is consistent with the agent used.≥80% relief for confirmatory block

NASS and AANS/CNS recommendations

Positive prognostic block threshold: A ≥50% reduction in pain is considered positive by some societies for prognostic purposes, though higher thresholds (eg, ≥80%) are used for confirmatory diagnostic paradigms.≥50% or ≥80% depending on guideline

Society variability

Conservative therapy requirement:

inv-04: Therapeutic Medial Branch Blocks - Coverage stance

Policy statements and guideline conclusions presented in this section:

Therapeutic medial branch blocks are not supported by current evidence as a routine therapeutic intervention; interventions described as unproven are considered not medically necessary due to insufficient evidence of efficacy.

Policy revision clarifying unproven/not medically necessary status (02/01/2026)

Therapeutic facet joint injections and medial branch blocks at the cervical, thoracic, or lumbar levels are identified in the policy as unproven and not medically necessary when intended as a primary treatment rather than as part of a diagnostic pathway leading to radiofrequency ablation. The policy specifies that injections performed after two prior same-level/same-side blocks (considered therapeutic rather than diagnostic), injections when radiofrequency ablation is not being considered at the requested level(s), and therapeutic injections for chronic spinal pain lack sufficient evidence of safety and efficacy to support coverage.

The policy notes that ultrasound guidance has not demonstrated an overall health benefit compared with fluoroscopy or CT guidance for spinal facet procedures. Comparative studies and systematic reviews report higher rates of incorrect needle placement with ultrasound guidance (pooled analyses showing an approximately 11–13% risk difference), and clinical guidelines do not recommend ultrasound as the preferred modality for facet joint or medial branch injections without documented operator expertise or justification.

Where the document lists specific therapeutic indications and procedural variations (for example, therapeutic medial branch blocks, repeat intra‑articular steroid injections, ultrasound‑guided injections, or injections when radiofrequency ablation is not being considered), these circumstances are described as unproven and not medically necessary due to insufficient evidence of clinical benefit and durability.

Therapeutic facet joint injections and medial branch blocks performed specifically to treat chronic spinal pain are considered unproven and not medically necessary because the available studies are low quality or inconsistent and do not establish sustained efficacy or safety for long‑term management.

The policy states that routine use of therapeutic medial branch blocks and repeat intra‑articular steroid facet joint injections is not supported by current evidence and is regarded as not medically necessary. Guideline summaries reference limited or low‑quality data and report at best variable short‑term benefit (often limited to 3–6 months) without consistent long‑term improvement.

Several specific therapeutic uses and procedural approaches are explicitly identified as unproven and not medically necessary in this policy, including injections when radiofrequency ablation is not being considered, therapeutic injections after diagnostic testing is complete, injections exceeding recommended local anesthetic volumes for medial branch blocks, and ultrasound‑guided injections in the absence of documented expertise or justification.

Procedure and Diagnosis Codes

Applicable Procedure CodesCPT

0213T	Injection(s), diagnostic or therapeutic agent, paravertebral facet (zygapophyseal) joint (or nerves innervating that joint) with ultrasound guidance, cervical or thoracic; single level.
0214T	Injection(s), diagnostic or therapeutic agent, paravertebral facet (zygapophyseal) joint (or nerves innervating that joint) with ultrasound guidance, cervical or thoracic; second level (List separately in addition to code for primary procedure).
0215T	Injection(s), diagnostic or therapeutic agent, paravertebral facet (zygapophyseal) joint (or nerves innervating that joint) with ultrasound guidance, cervical or thoracic; third and any additional level(s) (List separately in addition to code for primary procedure).
0216T	Injection(s), diagnostic or therapeutic agent, paravertebral facet (zygapophyseal) joint (or nerves innervating that joint) with ultrasound guidance, lumbar or sacral; single level.
0217T	Injection(s), diagnostic or therapeutic agent, paravertebral facet (zygapophyseal) joint (or nerves innervating that joint) with ultrasound guidance, lumbar or sacral; second level (List separately in addition to code for primary procedure).
0218T	Injection(s), diagnostic or therapeutic agent, paravertebral facet (zygapophyseal) joint (or nerves innervating that joint) with ultrasound guidance, lumbar or sacral; third and any additional level(s) (List separately in addition to code for primary procedure).
64490	Injection(s), diagnostic or therapeutic agent, paravertebral facet (zygapophyseal) joint (or nerves innervating that joint) with image guidance (fluoroscopy or CT), cervical or thoracic; single level.
64491	Injection(s), diagnostic or therapeutic agent, paravertebral facet (zygapophyseal) joint (or nerves innervating that joint) with image guidance (fluoroscopy or CT), cervical or thoracic; second level (List separately in addition to code for primary procedure).
64492	Injection(s), diagnostic or therapeutic agent, paravertebral facet (zygapophyseal) joint (or nerves innervating that joint) with image guidance (fluoroscopy or CT), cervical or thoracic; third and any additional level(s) (List separately in addition to code for primary procedure).
64493	Injection(s), diagnostic or therapeutic agent, paravertebral facet (zygapophyseal) joint (or nerves innervating that joint) with image guidance (fluoroscopy or CT), lumbar or sacral; single level.

1–10 of 12

1/2

Applicable Diagnosis Codes (ICD-10)ICD-10

M47.812	Spondylosis without myelopathy or radiculopathy, cervical region.
M47.813	Spondylosis without myelopathy or radiculopathy, cervicothoracic region.
M47.814	Spondylosis without myelopathy or radiculopathy, thoracic region.
M47.815	Spondylosis without myelopathy or radiculopathy, thoracolumbar region.
M47.816	Spondylosis without myelopathy or radiculopathy, lumbar region.
M47.817	Spondylosis without myelopathy or radiculopathy, lumbosacral region.
M47.819	Spondylosis without myelopathy or radiculopathy, site unspecified.
M47.892	Other spondylosis, cervical region.
M47.893	Other spondylosis, cervicothoracic region.
M47.894	Other spondylosis, thoracic region.

1–10 of 15

1/2

Diagnostic block positive threshold

Diagnostic positive threshold>= 50% pain relief for at least the expected minimum duration of the local anesthetic

Duration requirementRelief must persist for at least the expected minimum duration of the local anesthetic used

Documentation elementRecord magnitude and duration of pain relief and functional improvement specific to previously limited activities

Positive prognostic block threshold

Common prognostic threshold>= 50% reduction in pain is considered a positive prognostic block by several societies

Confirmatory threshold per NASS/AANS

Provider Requirements, Authorization, and Documentation

Prior Authorization

Prior Authorization Required

Prior authorization is required for the listed facet injection and medial branch block procedure codes.

Prior authorization required for listed procedure codes (see Applicable Codes).

Documentation Required

Documentation for Diagnostic Blocks

Document the level(s) and side(s) of the diagnostic block, the magnitude of pain relief (expressed as a percentage), and the duration of pain relief. A diagnostic block is considered positive when there is ≥ 50% relief for at least the expected minimum duration of effect of the local anesthetic used; some guidance sources use ≥ 80% relief when a confirmatory dual block is required prior to radiofrequency ablation.

For diagnostic blocks, document level and side.

Conservative Therapy Prior to Procedures

inv-36: Required prior to diagnostic injection — >= 4 weeks

Required prior to diagnostic injection:

Minimum conservative care: Documented failure of at least four weeks of conservative therapy (e.g., pharmacotherapy, exercise, physical therapy) prior to performing a diagnostic facet joint injection or medial branch block.>= 4 weeks

Documentation should specify therapies tried and lack of clinically significant improvement.

inv-37: Documented trial prior to prognostic/therapeutic facet procedures — generally 3 months for lumbar; at least 6 weeks for cervical

Documented trial prior to prognostic/therapeutic facet procedures:

Lumbar conservative trial: A trial of conservative therapies is recommended generally for 3 months prior to prognostic or therapeutic facet procedures for the lumbar spine.

Frequency Guidance and Limits

Facet joint/medial branch block confirmation and therapeutic repeats

Second diagnostic block purposeA second diagnostic block is allowed only to confirm the validity of an initial positive clinical response

Administration requirementSecond block must be administered at the same level and side as the initial block

Therapeutic classificationAfter two injections at same level/side, further injections are considered therapeutic rather than diagnostic

Frequency guidance (numeric limits not specified)

Numeric frequency limitsNo specific numeric frequency limits provided in this policy excerpt; emphasis is on diagnostic paradigms and conservative therapy prerequisites

Diagnostic vs therapeutic distinction

Imaging Guidance and Preferences

Billing Rule

Fluoroscopy or CT preferred; ultrasound guidance not supported

Fluoroscopy or CT guidance is the preferred imaging modality for facet joint and medial branch injections; ultrasound-guided injections are not supported for coverage without justification.

Ultrasound guidance is listed in codes but the policy states procedures performed under ultrasound guidance are considered unproven and not medically necessary.

Billing Rule

Fluoroscopy/CT preferred for cervical MBB and AO/AA planning (CT or MRI)

For cervical medial branch blocks and AO/AA joint injections use fluoroscopy or CT guidance as preferred; obtain pre-procedural advanced imaging (CT or MRI) for AO/AA planning as recommended.

Cervical MBB volumes should be ≤0.3 mL and cervical IA injections ≤1 mL as per ASRA recommendations.

Key Definitions

Facet Joint Injections (FJIs)

DefinitionInjection of a local anesthetic and/or corticosteroid into the facet joint capsule

Diagnostic roleCan be used to diagnose facet joint pain, though medial branch blocks are generally considered more appropriate for diagnosis

Diagnostic positive criterion>= 50% relief of pain for at least the expected minimum duration of the local anesthetic to be considered positive

Medial Branch Block (MBB)

DefinitionInjection of a local anesthetic and/or corticosteroid along the nerves supplying the facet joints (medial branch nerves)

Diagnostic purposeAnesthetic injection to assess whether the facet joint is the pain generator

Background and Clinical Context

Facet joint injections and medial branch blocks are used primarily as diagnostic tools to identify facetogenic sources of spinal pain and to select patients for definitive procedures such as radiofrequency denervation. Diagnostic blocks aim to reproduce the patient’s typical pain and demonstrate significant short‑term pain relief with a local anesthetic; when diagnostic criteria are met and confirmed, patients may be considered for neurotomy. Therapeutic injections are performed in a similar technical manner but, according to guideline and evidence summaries cited in the policy, lack robust evidence for long‑term benefit.

Not Covered / Not Medically Necessary

The policy lists as not covered: therapeutic facet joint or medial branch block injections at any spinal level (cervical, thoracic, lumbar) and related scenarios described as unproven or not medically necessary — for example, therapeutic injections when radiofrequency ablation is not being considered, injections after two prior same‑level/same‑side blocks, medial branch blocks with local anesthetic volume >0.5 ml, and ultrasound‑guided injections performed without documented justification.

Policy Revision History

2026-02-01policy_revisionLatest

Policy updated to add a reference link to the Anesthesia Policy, Professional; clarified that listed circumstances are unproven and not medically necessary for facet joint injections/medial branch blocks due to insufficient evidence of efficacy; supporting information, clinical evidence, and references were updated; prior version CS178PA.F was archived.

Policy Summary

PayerUnitedHealthcare

PolicyFacet Joint and Medial Branch Block Injections for Spinal Pain (for Pennsylvania Only)

Policy CodePolicy CS178PA.G

Change TypeClarified unproven/NOT medically necessary indications; added reimbursement reference

Effective DateFeb 1, 2026

Next Review Date

Key ActionObtain and document a minimum of four weeks of conservative therapy and prior authorization for listed procedure codes when billing for Pennsylvania members.

SourceLink

On This Page

Recommend a trial of conservative therapies prior to facet joint interventions: commonly 3 months for lumbar and at least 6 weeks (personalized) for cervical cases; conservative care may include medications, physical therapy, integrative treatments.

3 months (lumbar) / ≥6 weeks (cervical individualized)

ASRA, NASS, consensus

Therapeutic facet injections: Current evidence does not support routine use of therapeutic medial branch blocks or intra-articular steroid injections for long-term management; evidence for short-term pain/function improvement is variable and often limited to 3–6 month follow-up in trials.limited durability (3–6 months)

Systematic reviews and guideline summaries

>= 80% relief is required for a confirmatory (second) diagnostic medial branch block

Society variabilityThresholds vary by guideline; some endorse 50% for prognostic use and 80% for confirmatory diagnostic paradigms

Report percent pain relief and duration (e.g., ≥50% relief for expected anesthetic duration; confirmatory criteria may require ≥80% for some pathways).

Document functional improvement specific to activities previously limited by the facetogenic pain.

Documentation Required

Second Diagnostic Block Requests

Requests for a second diagnostic block are allowable only when the initial diagnostic block produced a positive response and confirmation is needed per clinical guidance. A second confirmatory block should be at the same level and side as the initial block unless a different level is suspected to be the pain generator. A second diagnostic block is not medically necessary if the initial injection did not confirm the joint as the source of pain.

Second diagnostic block permitted when initial block produced a positive response and confirmation is required (same level/side).
Second block may be at a different/additional level if initial block relief was <80% and a different joint is suspected.
Second diagnostic block is not medically necessary when the initial injection did not confirm the joint as the pain source.

Documentation Required

Clinical Documentation to Support Indication

Clinical documentation must support that the targeted facet joint or medial branch meets diagnostic criteria before proceeding with repeat diagnostic procedures or radiofrequency ablation. This includes: facet-loading physical exam maneuvers reproducing pain, appropriate imaging excluding alternate pain generators, documentation of conservative therapy trials, and clear rationale that RFA is being considered.

Document facet-loading physical exam maneuvers (e.g., hyperextension, rotation) with reproduction of pain.
Provide imaging findings and clinical assessment excluding other causes (e.g., disc herniation, spinal stenosis with neurogenic claudication, infection, tumor, fracture, post-surgical pain).
State that a radiofrequency joint denervation/ablation procedure is being considered.
Document level and side of suspected joint and correlate with clinical findings.

Documentation Required

Conservative Therapy and Failure Documentation

Conservative therapy must be documented and shown to have failed prior to diagnostic injections: typically a minimum of 4 weeks for general conservative care, commonly 3 months for lumbar pain, and at least 6 weeks (personalized) for cervical pain per specialty guidance. Documentation must describe therapies tried (medication, physical therapy, exercise, etc.) and lack of adequate clinical improvement.

Minimum 4 weeks of conservative care generally required; lumbar commonly 3 months; cervical at least 6 weeks with personalization.
List specific therapies attempted and dates/duration (e.g., NSAIDs, PT, exercise).
Document persistent pain level (e.g., ≥3/10) and functional limitations despite conservative care.

Denial Risk

Denial for Unproven / Not Medically Necessary Indications

Denials may be issued for requests that are unproven or not medically necessary. Examples include therapeutic facet joint or medial branch injections (not diagnostic), repeat therapeutic injections after two diagnostic blocks, second diagnostic blocks when the initial block was negative, injections when RFA is not being considered, injection volumes exceeding recommended limits, and procedures performed under ultrasound guidance when not supported.

Denial for therapeutic facet injections/medial branch blocks for chronic spinal pain (not diagnostic).
Denial for second diagnostic block if initial injection did not confirm pain source.
Denial when RFA is not being considered at the requested level(s).
Denial when recommended injectate volumes are exceeded (e.g., MBB >0.5 mL lumbar; cervical MBB >0.3 mL; IA lumbar >1.5 mL).
Denial for procedures performed under ultrasound guidance when policy deems them not supported.

Cervical conservative trial: For cervical procedures, document at least a 6-week trial of conservative therapy individualized to the patient; many guidelines recommend up to 3 months based on clinical judgment.>= 6 weeks (personalized)

Consensus practice guidelines and ASRA statements.

Guidance limits repeated injections: second confirmatory diagnostic block allowed only when initial response meets criteria; repeat therapeutic injections after two diagnostic blocks are considered therapeutic

Conservative therapy prerequisiteMinimum of four weeks of conservative care required prior to diagnostic injection; longer conservative trials commonly recommended before prognostic/therapeutic procedures

Facet joint/medial branch injection frequency (document excerpt)

Frequency numeric limits absentNo explicit numeric frequency limits for facet joint injections or medial branch blocks are provided in this excerpt

Repeated injections classificationInjections after two prior same-level/same-side blocks are considered therapeutic and are listed as unproven/not medically necessary

Ultrasound and volume exclusionsPolicy lists other procedural limits (eg, medial branch block volume >0.5 mL and ultrasound-guided procedures) which affect coverage but do not define frequency

Note

Comparative effectiveness notes on ultrasound vs fluoroscopy/CT guidance

Comparative-effectiveness literature is referenced regarding ultrasound versus fluoroscopy/CT guidance; note that meta-analyses have evaluated ultrasound guidance effectiveness and potential increased risk of incorrect needle placement.

Providers should document rationale and operator expertise if deviating from fluoroscopy/CT guidance given mixed comparative evidence.

Positive threshold>= 50% relief for at least the expected minimum duration of the anesthetic to be considered a positive diagnostic medial branch block

Conservative Therapy

DefinitionConservative Therapy consists of medication (eg, NSAIDs, analgesics) plus physical therapy, spinal manipulation, cognitive behavioral therapy, or other individualized interventions

Recommended trial before diagnostic injectionMinimum of four weeks of conservative care is required prior to diagnostic injection

Recommended duration before prognostic/therapeutic proceduresCommonly 3 months for lumbar interventions and at least 6 weeks (personalized) for cervical cases

Diagnostic medial branch block (MBB) and confirmatory blocks

DefinitionAn anesthetic injection targeting medial branch nerves to assess whether the facet joint is the pain generator

Dual/confirmatory block rationaleDual (two) diagnostic medial branch blocks are recommended to confirm diagnosis due to high false-positive rate

Confirmatory criteriaA second confirmatory injection is indicated only if the first injection produces >= 80% relief and the onset/duration is consistent with the anesthetic used

Therapeutic medial branch block or intra-articular injection

DefinitionAn injection intended to provide longer-term pain relief, often including steroid (intra-articular or perineural), intended as therapeutic rather than diagnostic

Evidence statementCurrent evidence does not robustly support routine therapeutic use of medial branch blocks or intra-articular steroid injections for long-term management

Use considerationsMay be considered in select patients (eg, high risk for RFA complications) but generally recommended against as routine therapy

Therapeutic MBBs — practice and evidence

Practice similarityTherapeutic MBBs are performed in the same manner as diagnostic MBBs but are intended for long-term pain management

Evidence limitationCurrent evidence does not support therapeutic MBBs as an effective long-term intervention

Guideline positionSociety guidelines and this policy identify therapeutic MBBs as unproven and not medically necessary for routine use