CurrentevicorePolicy CMM-209

Regional Sympathetic Blocks

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Medical necessity and coverage criteria for regional sympathetic blocks (stellate ganglion and lumbar sympathetic chain blocks) for management of sympathetically mediated pain, primarily CRPS, applied to Cigna health benefit plans administered by eviCore.

Policy Summary

Payerevicore (for Cigna-administered plans)

PolicyRegional Sympathetic Blocks

Policy CodePolicy CMM-209

Change TypeNo material change

Effective DateAug 4, 2026

Next Review Date

Key ActionDocument that diagnostic criteria for CRPS are met (symptoms in ≥3 categories and signs in ≥2 categories) and that initial diagnostic block provided ≥50% pain relief before additional diagnostic blocks are performed.

SourceLink

POLICY UPDATE CHANGES

No material clinical or coverage changes in this revision.

4max diagnostic blocks in 2 weeks

6max therapeutic blocks per 12 months

10max total per 12 months

7dtherapeutic interval

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CurrentevicorePolicy CMM-209

Regional Sympathetic Blocks

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Policy Summary

Payerevicore (for Cigna-administered plans)

PolicyRegional Sympathetic Blocks

Policy CodePolicy CMM-209

Change TypeNo material change

Effective DateAug 4, 2026

Next Review Date

SourceLink

POLICY UPDATE CHANGES

No material clinical or coverage changes in this revision.

4max diagnostic blocks in 2 weeks

6max therapeutic blocks per 12 months

10max total per 12 months

7dtherapeutic interval

Initial + up to 3additional diagnostic allowed

Coverage Criteria for Regional Sympathetic Blocks

Initial Diagnostic Regional Sympathetic Block

Initial diagnostic regional sympathetic block is considered medically necessary when ALL of the following are met:

Performed to establish diagnosis: Performed to establish the presence or absence of sympathetically mediated complex regional pain syndrome (CRPS).

Continuing disproportionate pain: Presence of continuing pain that is disproportionate to any inciting event.

Symptoms: Patient reports at least one symptom in at least THREE (3) of the following categories: Sensory (hyperesthesia and/or allodynia); Vasomotor (temperature asymmetry, skin color changes/asymmetry); Sudomotor/edema (edema, sweating changes/asymmetry); Motor/trophic (decreased range of motion, motor dysfunction, trophic changes).>=1 symptom in >=3 categories

Categories defined in policy.

Signs: Must display at least one sign on physical exam at the time of evaluation in at least TWO (2) of the following categories: Sensory (hyperalgesia and/or allodynia); Vasomotor (temperature asymmetry, skin color changes/asymmetry); Sudomotor/edema (edema, sweating changes/asymmetry); Motor/trophic (decreased range of motion, motor dysfunction, trophic changes).>=1 sign in >=2 categories

Signs defined in policy.

Exclude other diagnoses: No other medical or psychological diagnoses concordant with the presenting symptoms, signs, and results of relevant studies (e.g., imaging, electrodiagnostic testing, laboratory testing).

Anatomic limitation: Diagnosis limited to the extremities only; not to the head, face, neck, trunk, perineum, pelvis, or abdominal viscera.

Initial Diagnostic Regional Sympathetic Block (alternate listing)

An initial diagnostic regional sympathetic block is considered medically necessary when BOTH of the following criteria have been met:

Purpose and diagnostic criteria

Pain: Presence of continuing pain disproportionate to any inciting event.
Symptoms: Patient reports at least one symptom in at least THREE (3) categories: Sensory (hyperesthesia and/or allodynia); Vasomotor (temperature asymmetry, skin color changes/asymmetry); Sudomotor/edema (edema, sweating changes/asymmetry); Motor/trophic (decreased range of motion, motor dysfunction, trophic changes).>=3 categories
Signs: Displays at least one sign on physical exam at the time of evaluation in at least TWO (2) categories: Sensory (hyperalgesia and/or allodynia); Vasomotor (temperature asymmetry, skin color changes/asymmetry); Sudomotor/edema (edema, sweating changes/asymmetry); Motor/trophic (decreased range of motion, motor dysfunction, trophic changes).

Additional Diagnostic Regional Sympathetic Blocks

Up to three (3) additional regional sympathetic blocks are considered medically necessary to diagnose the individual's pain when BOTH of the following have been met:

Initial positive diagnostic response: The initial diagnostic regional sympathetic block resulted in a positive response with documented pain relief of at least 50% and documented concomitant increase in function for the duration of the local anesthetic used.>=50% pain relief

Document increased function during effect of anesthetic.

Timing of additional blocks: Additional diagnostic regional sympathetic blocks are performed within the first two (2) weeks following the initial diagnostic regional sympathetic block.<=2 weeks

Limit up to 3 additional blocks.

Frequency cap: No more than four (4) diagnostic regional sympathetic blocks are considered medically necessary within two (2) weeks (initial plus up to three additional).

Therapeutic Regional Sympathetic Blocks

Therapeutic regional sympathetic blocks are considered medically necessary when ALL of the following criteria have been met:

Prior therapeutic response: A prior therapeutic regional sympathetic block resulted in a positive response evidenced by ALL of the following: decreased use of pain medication; increased functional ability (e.g., increased range of motion, strength, and use of the extremity in activities of daily living); and increased tolerance to touch (decreased allodynia).

Document objective functional improvement and medication reduction when possible.

Conservative care and rehabilitation: Therapeutic regional sympathetic blocks are provided as part of a comprehensive pain management program AND the individual has ongoing participation in an active rehabilitation/functional restoration program.

Blocks alone are insufficient to alter long-term outcomes; intent is to facilitate rehabilitation.

Frequency interval: Therapeutic regional sympathetic blocks are considered medically necessary no more frequent than once every seven (7) days.>=7 days between therapeutic blocks

The guideline criteria explicitly exclude procedures directed at other autonomic nerves. The listed examples include the sphenopalatine ganglion, carotid sinus, superior hypogastric plexus, celiac plexus, Gasserian (trigeminal) ganglion, splanchnic nerve, Ganglion of Impar, and rami communicans. These injections/blocks are not applicable under this policy and should be considered outside the scope of the regional sympathetic block coverage criteria.

Regional sympathetic blocks for a diagnosis of Complex Regional Pain Syndrome (CRPS) are limited anatomically to the extremities. Procedures performed for CRPS diagnoses affecting the head, face, neck, trunk, perineum, pelvis, or abdominal viscera are considered not medically necessary and are excluded from coverage under this policy.

Several citation sections in the policy provide literature references and supporting bibliography related to CRPS and regional sympathetic block techniques. These bibliographic chunks supply background and evidence context but do not themselves state explicit coverage exclusions or policy coverage rules.

Regional sympathetic blocks performed as isolated treatments — i.e., without an intent to facilitate participation in an active rehabilitation or functional restoration program — are insufficiently supported to change long-term outcomes in recalcitrant CRPS. Therefore, such isolated blocks should be performed with integration into an active rehabilitation/functional restoration plan and documentation reflecting that intent.

Procedures that do not meet the policy Definitions, General Guidelines, and Indications are considered not medically necessary. In addition, regional sympathetic procedures performed using radiofrequency ablation (RFA) or chemical neurolysis (phenol or ethyl alcohol) are classified as experimental, investigational, or unproven and are therefore not medically necessary under this policy.

The bibliography and reference lists included in the cited chunks provide evidence sources and background on CRPS and sympathetic blockade but do not contain standalone declarations that specific services are not medically necessary. Explicit not-medically-necessary statements appear elsewhere in the policy text rather than in these bibliographic entries.

Codes and Coding Notes

Codes listed in policyCPT

64510	Injection, anesthetic agent; stellate ganglion (cervical sympathetic)
64520	Injection, anesthetic agent; lumbar or thoracic (paravertebral sympathetic)

Additional diagnostic block threshold

Pain relief threshold for additional diagnostic blocks>= 50% documented pain relief with increased function for duration of local anesthetic

Provider Requirements, Authorization, and Documentation

Prior Authorization

Follow eviCore/Cigna and benefit‑plan prior authorization processes

Coverage determinations are made according to the terms of the applicable benefit plan; follow eviCore/Cigna prior authorization processes and any plan-specific management details where required.

In the absence of federal/state mandates, the Certificate of Coverage or Evidence of Coverage governs benefits.
In the event of conflict, the member's benefit plan document supersedes this policy.

Prior Authorization

Prior authorization may be required for CPT 64510 and 64520

Prior authorization may be required per the applicable health plan for the CPT codes listed in this policy (CPT 64510, 64520); inclusion in the code table does not guarantee coverage and does not by itself trigger authorization—refer to the applicable plan for management details.

Codes listed: 64510 (stellate ganglion injection), 64520 (lumbar/thoracic paravertebral sympathetic injection).
Prior authorization of a code is not a guarantee of payment; check the member’s Certificate of Coverage or Evidence of Coverage.

Background and Clinical Context

Complex Regional Pain Syndrome (CRPS) is described as a painful condition often following injury, with a regional distribution and pain that is disproportionate to any inciting event. It can be associated with motor impairment and variable progression. Regional sympathetic blocks—typically injection of local anesthetic near sympathetic ganglia such as the stellate ganglion or lumbar sympathetic chain under image guidance—may be used diagnostically or therapeutically to reduce sympathetic activity and to help determine whether pain is sympathetically mediated.

Definitions

Regional Sympathetic Blocks (definition)

DefinitionInjection of local anesthetic along the sympathetic ganglia (e.g., stellate ganglion, lumbar sympathetic chain) using image guidance to reduce sympathetic nervous system activity.

Common proceduresStellate ganglion block; lumbar sympathetic chain block

PurposeDiagnostic to establish sympathetically mediated CRPS or therapeutic to reduce sympathetic activity and improve function

Complex Regional Pain Syndrome (CRPS)

DefinitionA variety of painful conditions following injury with distal predominance of abnormal findings, pain disproportionate to the inciting event, possible motor impairment, and variable progression; may also follow medical disorders.

Typical distributionRegional with distal predominance, limited to the extremities for purposes of this policy

Conservative Treatment and Rehabilitation Requirements

Frequency and Quantity Limits

Diagnostic regional sympathetic blocks - frequency

Diagnostic block frequency limitNo more than 4 diagnostic regional sympathetic blocks within 2 weeks

Same-day proceduresOnly one invasive modality or procedure on the same date of service is considered medically necessary

ContextApplies when diagnostic criteria have been met

Therapeutic regional sympathetic blocks - interval

Therapeutic block intervalTherapeutic regional sympathetic blocks no more frequent than once every 7 days

Annual total considerationTherapeutic blocks count toward the total rolling 12-month limit of 10 procedures

Image Guidance and Technique Requirements

Documentation Required

Use image guidance per policy: stellate (fluoroscopy or ultrasound); lumbar (fluoroscopy)

Stellate ganglion blocks require fluoroscopic- or ultrasound-guidance and lumbar sympathetic chain blocks require fluoroscopic-guidance when criteria are met; follow image-guidance requirements in the policy when performing these procedures.

Stellate: fluoroscopy or ultrasound
Lumbar sympathetic chain: fluoroscopy

Documentation Required

Perform blocks using accepted imaging-guided techniques

References within the policy discuss and support the use of imaging-guided techniques for sympathetic blocks; perform procedures consistent with accepted interventional pain imaging guidance.

Note

Not Covered / Experimental Procedures

Not covered under this policy are procedures outside the defined regional sympathetic block indications: other autonomic nerve blocks listed in the exclusions (see the exclusion list above). In addition, the policy designates radiofrequency ablation for regional sympathetic targets and chemical neurolysis (phenol or ethyl alcohol) as experimental/investigational and therefore not covered.

Policy Summary

Payerevicore (for Cigna-administered plans)

PolicyRegional Sympathetic Blocks

Policy CodePolicy CMM-209

Change TypeNo material change

Effective DateAug 4, 2026

Next Review Date

SourceLink

On This Page

Exclusion of other diagnoses: No other medical or psychological diagnoses concordant with presenting symptoms, signs, and relevant studies.

Anatomic limitation: Diagnosis limited to the extremities; not to head, face, neck, trunk, perineum, pelvis, or abdominal viscera.

(Redundant top-level placeholder removed)

Concurrent invasive procedures: Only one invasive modality or procedure performed on the same date of service is considered medically necessary.

Annual total limit: Up to a total of 10 regional sympathetic blocks (4 diagnostic and 6 therapeutic combined) are considered medically necessary during a rolling 12-month period.<=10 per 12 months

Technical requirements: When criteria are met, blocks must be performed with appropriate injectates (anesthetic, corticosteroid, and/or contrast) and with image guidance as indicated: stellate ganglion blocks require fluoroscopic- or ultrasound-guidance; lumbar sympathetic chain blocks require fluoroscopic-guidance.

Note

Reference sections do not specify prior‑authorization codes

Certain sections of the document (bibliography and references) do not list CPT/HCPCS codes or explicit prior authorization requirements and serve as supporting literature rather than authorization guidance.

Step Therapy

Perform blocks to facilitate active rehabilitation/functional restoration

Regional sympathetic blocks for recalcitrant CRPS should be performed with the intent to facilitate involvement in an active rehabilitation/functional restoration program; blocks alone are considered insufficient to alter long‑term outcomes.

Perform blocks to support progression in an active rehabilitation or functional restoration program.
Use blocks as part of a strategy to enable participation in therapy rather than as isolated treatment.

Step Therapy

Therapeutic blocks require participation in comprehensive pain management and rehab

Therapeutic regional sympathetic blocks must be provided as part of a comprehensive pain management program with ongoing participation in an active rehabilitation/functional restoration program.

Documentation of ongoing participation in active rehabilitation/functional restoration is required for therapeutic blocks.
Therapeutic blocks require evidence of integration into a broader comprehensive pain management plan.

Step Therapy

No formal step‑therapy algorithm specified

The policy does not describe any step‑therapy sequencing requirements beyond integration with rehabilitation and comprehensive pain management; no formal step‑therapy algorithm is specified in the cited sections.

Documentation Required

Document CRPS diagnostic criteria and exclusion of other diagnoses

Documentation must support that diagnostic criteria for CRPS were met, including continuing pain disproportionate to any inciting event, patient‑reported symptoms in at least three categories, signs on exam in at least two categories, exclusion of other diagnoses, and limitation of the diagnosis to the extremities.

Symptoms required: ≥1 symptom in ≥3 categories (sensory, vasomotor, sudomotor/edema, motor/trophic).
Signs required: ≥1 sign on exam in ≥2 categories (sensory, vasomotor, sudomotor/edema, motor/trophic).
Exclude other medical or psychological diagnoses concordant with presentation and relevant studies (imaging, electrodiagnostics, labs).
Confirm diagnosis limited to the extremities (not head/face/neck/trunk/perineum/pelvis/abdominal viscera).

Documentation Required

Document response thresholds for additional diagnostic and therapeutic blocks

Documentation should demonstrate that: the initial diagnostic block produced ≥50% pain relief with increased function for the duration of the local anesthetic; additional diagnostic blocks (if performed) were within two weeks of the initial block; and for therapeutic blocks, prior positive response (decreased pain medication, increased function, decreased allodynia) and ongoing participation in rehabilitation are present.

Initial diagnostic positive response: ≥50% pain relief and concomitant increase in function for duration of local anesthetic.
Additional diagnostic blocks must be performed within 2 weeks of the initial diagnostic block (limit up to 3 additional).
Therapeutic block documentation: prior positive response (decreased medication use, increased function, decreased allodynia) and active rehab participation.

Note

Reference sections do not add documentation requirements

The bibliography and reference sections contain literature support but do not specify additional documentation requirements beyond those in the main criteria and documentation sections.

Denial Risk

Medical necessity is determined case‑by‑case; failure to meet criteria may lead to denial

Medical necessity determinations are individualized and procedures may be denied if the policy criteria are not met on a case‑by‑case basis.

The determination of medical necessity is always made on a case‑by‑case basis.
Follow plan terms and documented clinical criteria when seeking authorization to avoid denials.

Denial Risk

Procedures not meeting policy criteria may be denied as not medically necessary

Regional sympathetic blocks performed without meeting the Definitions, General Guidelines, and Indications sections are considered not medically necessary and may be denied.

Ensure all Definitions, General Guidelines, and Indications criteria are met before performing or billing for blocks.
Blocks performed outside the documented criteria risk denial as not medically necessary.

Denial Risk

Do not perform/seek coverage for blocks outside extremities (anatomic exclusions)

Regional sympathetic blocks performed for CRPS of the head, face, neck, trunk, perineum, pelvis, or abdominal viscera are excluded from coverage and are considered not medically necessary.

Limit indications and coding to procedures addressing extremity CRPS only.
Do not seek coverage for blocks aimed at the excluded anatomic sites under this policy.

Note

References do not specify additional authorization or documentation triggers

The bibliography/reference chunks do not include explicit authorization triggers, required documentation elements, or prior authorization codes; they provide supporting citations for the clinical context.

Clinical impactOften results in significant impairment of motor function and prolonged symptoms beyond expected course

Diagnostic criteria for CRPS (policy use)

Core diagnostic requirementContinuing pain disproportionate to any inciting event

Symptom thresholdAt least one symptom reported in ≥3 categories: Sensory, Vasomotor, Sudomotor/edema, Motor/trophic

Sign thresholdAt least one sign on physical exam in ≥2 categories: Sensory, Vasomotor, Sudomotor/edema, Motor/trophic

Exclusion and anatomic limitNo other medical/psychological diagnosis explains presentation; diagnosis limited to extremities

CRPS bibliographic definition note

Bibliographic noteCRPS is a chronic pain condition extensively referenced; citations include classification, mechanisms, and treatment studies and reviews (e.g., Cochrane reviews, clinical series).

Key referencesIncludes systematic reviews and clinical studies such as Cochrane reviews of local anesthetic sympathetic blockade and sympathectomy

ScopeReferences support clinical context but do not define coverage criteria themselves

Applies when therapeutic criteria and program participation requirements have been met

Regional sympathetic blocks - rolling 12-month total

Total annual limitUp to 10 total regional sympathetic blocks (4 diagnostic + 6 therapeutic) during a rolling 12-month period

CompositionIncludes a maximum of 4 diagnostic and up to 6 therapeutic blocks within the 10-total limit

Applies whenCriteria and technical requirements have been met

Additional diagnostic blocks allowance

Additional diagnostic allowanceUp to 3 additional diagnostic regional sympathetic blocks may be performed following a positive initial diagnostic block

Timing requirementAdditional blocks must be performed within the first 2 weeks after the initial diagnostic block

Positive response requirementInitial block must have documented ≥50% pain relief and increased function for the duration of the local anesthetic

Bibliography frequency note

Bibliography frequency noteThe cited reference sections provide supporting literature for CRPS and sympathetic block techniques but do not specify additional frequency limits beyond the policy statements.

Nature of contentReferences include systematic reviews, clinical series, and consensus reports relevant to CRPS management

UseInformative support rather than prescriptive coverage rules

Bibliography sections do not add imaging requirements

Bibliography chunks do not state imaging requirements themselves; they serve as supporting references for clinical context and evidence.