CurrentAmbetter NevadaPolicy CP.MP.164

Caudal or Interlaminar Epidural Steroid Injections

Defines medical necessity, coverage limits, and coding guidance for caudal and interlaminar epidural steroid injections for members/enrollees of Ambetter Nevada (Centene-affiliated health plans). Applies to physicians performing these invasive pain management procedures.

Policy Summary

PayerAmbetter Nevada

PolicyCaudal or Interlaminar Epidural Steroid Injections

Policy CodePolicy CP.MP.164

Change TypeNo material change

Effective DateN/A

Next Review DateN/A

Key ActionObtain prior authorization and document failure of required conservative therapy before requesting an initial ESI for chronic pain.

SourceLink

POLICY UPDATE CHANGES

No material clinical or coverage changes in this revision.

1/visitprocedure limit

≤4therapeutic injections/12mo

≥50%relief threshold

≥3 mochronic pain duration

≥4 wkconservative therapy duration

Medical Necessity and Coverage Criteria

inv-01: Acute pain indication

Covered when ALL of the following are met for acute pain (< 3 months).

Acute ESI (single injection): 1) Severe radicular pain that interferes substantially with activities of daily living (ADLs); 2) Severe pain persists after treatment with NSAIDs and/or opiates (both ≥ 3 days or contraindicated/not tolerated); 3) Member cannot tolerate chiropractic or physical therapy and the injection is intended as a bridge to therapy; 4) Only one procedure is performed per visit and imaging guidance is expected (exceptions allowed only in rare, documented instances)pain duration < 3 months

From policy I.A

inv-02: Initial ESI for chronic pain

Covered when ALL of the following are met for chronic pain.

Initial chronic ESI: 1) Request is for one caudal or interlaminar ESI at one level (cervical, thoracic, or lumbar); 2) Persistent radicular pain caused by spinal stenosis, disc herniation, or degenerative vertebral changes confirmed by physical exam and imaging; 3) Pain interferes with ADLs and has lasted ≥ 3 months; 4) Failed conservative therapy including: a) ≥ 4 weeks of chiropractic, physical therapy, or prescribed home exercise program; b) NSAID for ≥ 3 weeks or NSAID contraindicated/not tolerated; c) ≥ 4 weeks of activity modification

Policy Summary

PayerAmbetter Nevada

PolicyCaudal or Interlaminar Epidural Steroid Injections

Policy CodePolicy CP.MP.164

Change TypeNo material change

Effective DateN/A

Next Review DateN/A

Key ActionObtain prior authorization and document failure of required conservative therapy before requesting an initial ESI for chronic pain.

SourceLink

On This Page

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pain duration ≥ 3 months

From policy I.B and I.B.4.a-c

inv-03: Second ESI after no improvement

Covered when ALL of the following are met for a second ESI after an ineffective first ESI.

Second ESI after failed first: 1) Request is for an ESI at one level (cervical, thoracic, or lumbar); 2) At least 2 weeks have passed since the first ESI≥ 2 weeks since prior injection

From policy I.C

inv-04: Subsequent ESI after prior improvement

Covered when ALL of the following are met for subsequent ESI after prior improvement.

Subsequent ESI for recurrence: 1) Initial injection(s) produced ≥ 50% pain relief and functional improvement for at least 2 months; 2) At least 2 months have passed since the last ESI; 3) Fewer than 4 injections have been administered within 12 months; 4) Less than 12 months have elapsed since the initial injection at the level requested≥ 50% relief for ≥ 2 months; < 4 injections/12 months

From policy I.D

inv-05: Not medically necessary—limits and other indications

Not covered when ANY of the following apply.

Not medically necessary conditions: 1) A third or subsequent caudal or interlaminar ESI for chronic pain that did not improve from the first two ESIs (effectiveness not established); 2) Continuation of injections beyond 12 months or more than four therapeutic injections (effectiveness and safety not established); 3) Caudal or interlaminar ESI for any other indication or location not supported by effectiveness

From policy II, III, IV

Caudal or interlaminar epidural steroid injections (ESIs) for indications or anatomical locations other than those specifically addressed in this policy are considered not medically necessary. The policy states that effectiveness has not been established for other indications or locations, and such requests do not meet the medical necessity criteria described for acute or chronic radicular pain, recurrence after prior improvement, or second injections following a defined interval.

A third or subsequent caudal or interlaminar ESI for chronic pain that did not improve from the first two ESIs is considered not medically necessary because effectiveness has not been established for repeated injections after two ineffective treatments.

Required Conservative Treatments Before ESI

inv-17: Documented failure or intolerance of specified conservative therapies

Documented failure or intolerance of the following conservative therapies is required before initial chronic ESI:

Conservative therapy requirements: 1) ≥ 4 weeks of chiropractic care, physical therapy, or a prescribed home exercise program; 2) NSAID trial for ≥ 3 weeks or documentation that NSAIDs are contraindicated or not tolerated; 3) ≥ 4 weeks of activity modification≥ 4 weeks (PT/home exercise/activity modification); ≥ 3 weeks (NSAID)

From policy I.B.4 and Conservative Treatment Requirements

Limits on Number and Frequency of Injections

Frequency limits — caudal or interlaminar ESI

Frequency limitCaudal or interlaminar epidural steroid injections (ESIs): ≤ 4 therapeutic injections per 12 months

Procedure-per-visitOne procedure per visit (only one injection per visit)

Duration windowLimit applies over a 12-month rolling period

Maximum therapeutic injections

Maximum injectionsMaximum of ≤ 4 therapeutic caudal or interlaminar injections per 12 months

Continuation restrictionContinuation beyond 12 months or more than four therapeutic injections is considered not medically necessary

Case-by-case exceptionWhen more definitive therapies cannot be tolerated or provided, consideration may be made on a case‑by‑case basis

Procedure and Billing Codes

Referenced CPT codes for caudal/interlaminar ESIsCPT

62320	Injection(s), of diagnostic or therapeutic substance(s) (eg, anesthetic, antispasmodic, opioid, steroid, other solution), not including neurolytic substances, including needle or catheter placement, interlaminar epidural or subarachnoid, cervical or thoracic; without imaging guidance.
62321	Injection(s), of diagnostic or therapeutic substance(s) (eg, anesthetic, antispasmodic, opioid, steroid, other solution), not including neurolytic substances, including needle or catheter placement, interlaminar epidural or subarachnoid, cervical or thoracic; with imaging guidance (i.e., fluoroscopy or CT).
62322	Injection(s), of diagnostic or therapeutic substance(s) (eg, anesthetic, antispasmodic, opioid, steroid, other solution), not including neurolytic substances, including needle or catheter placement, interlaminar epidural or subarachnoid, lumbar or sacral (caudal); without imaging guidance.
62323	Injection(s), of diagnostic or therapeutic substance(s) (eg, anesthetic, antispasmodic, opioid, steroid, other solution), not including neurolytic substances, including needle or catheter placement, interlaminar epidural or subarachnoid, lumbar or sacral (caudal); with imaging guidance (i.e., fluoroscopy or CT).
62324	Injection(s), including indwelling catheter placement, continuous infusion or intermittent bolus, of diagnostic or therapeutic substance(s) (eg, anesthetic, antispasmodic, opioid, steroid, other solution), not including neurolytic substances.
62325	Interlaminar epidural or subarachnoid, cervical or thoracic; without imaging guidance. Injection(s), including indwelling catheter placement, continuous infusion or intermittent bolus, of diagnostic or therapeutic substance(s) (eg, anesthetic, antispasmodic, opioid, steroid, other solution), not including neurolytic substances; with imaging guidance (i.e., fluoroscopy or CT).
62326	Injection(s), including indwelling catheter placement, continuous infusion or intermittent bolus, of diagnostic or therapeutic substance(s) (eg, anesthetic, antispasmodic, opioid, steroid, other solution), not including neurolytic substances, interlaminar epidural or subarachnoid, lumbar or sacral (caudal); without imaging guidance.
62327	Injection(s), including indwelling catheter placement, continuous infusion or intermittent bolus, of diagnostic or therapeutic substance(s) (eg, anesthetic, antispasmodic, opioid, steroid, other solution), not including neurolytic substances, interlaminar epidural or subarachnoid, lumbar or sacral (caudal); with imaging guidance (i.e., fluoroscopy or CT).

Provider Requirements, Prior Authorization, and Documentation

Prior Authorization

Prior Authorization Required

Prior authorization is required for caudal or interlaminar epidural steroid injections (ESIs) that meet the medical necessity criteria in this policy. Submit documentation showing the indication (acute vs. chronic), specific spinal level, imaging confirmation, and that only one procedure will be performed per visit. Requests that do not include required documentation or that do not meet the clinical criteria may be denied.

Applies to caudal or interlaminar ESIs in cervical, thoracic, or lumbar regions
One procedure allowed per visit
Imaging guidance required except when rare, documented justification is provided
Prior authorization must reference policy CP.MP.164

Step Therapy

Conservative Therapy Required Before Chronic ESI

For chronic radicular pain, conservative therapy must be documented and failed before approving an initial therapeutic ESI. Documentation must include start and end dates, modalities tried, and response to therapy.

≥ 4 weeks of chiropractic care, supervised physical therapy, or prescribed home exercise program
NSAID therapy for ≥ 3 weeks unless contraindicated or not tolerated
≥ 4 weeks of activity modification
Evidence that pain has lasted ≥ 3 months and interferes with activities of daily living

Denial Risk

Exceeded Allowed Number or Duration

Requests for additional ESIs that exceed the policy limits are considered not medically necessary. A third or subsequent ESI for chronic pain that did not improve after two injections is not covered. Continuation beyond 12 months or more than four therapeutic injections in 12 months is not covered except in rare, case-by-case situations with strong justification.

Third or subsequent ESI after two unsuccessful ESIs for chronic pain: not medically necessary
More than four therapeutic injections within 12 months: not medically necessary
Continuation of injections beyond 12 months: not medically necessary
Exceptions may be considered only when more definitive therapies cannot be tolerated or provided and strong clinical justification is documented

Documentation Required

Required Clinical Documentation

Required clinical documentation must demonstrate the indication (acute vs. chronic), severity and functional impairment, imaging and physical exam findings, conservative therapies tried with dates and responses, date and result of prior ESIs (including percent pain relief and duration), and justification for any deviation from standard requirements.

Indication: acute (<3 months) vs chronic (≥3 months) with description of ADL impact
Physical exam and imaging confirming etiology (e.g., disc herniation, spinal stenosis, degenerative changes)
Conservative therapy records with start/end dates and response
If prior ESI(s) given: date(s), percent pain relief, duration of benefit, and reason for repeat request
If anticoagulation or antiplatelet therapy management deviates from standard, provide clinical justification

Imaging Guidance for Procedure

Billing Rule

CT or fluoroscopy generally required for caudal/interlaminar ESIs

Use imaging guidance (CT or standard fluoroscopy) for caudal or interlaminar ESIs; imaging guidance is expected except in rare instances with documented justification.

Key Definitions

Definition — Epidural steroid injection (ESI)

DefinitionEpidural steroid injection (ESI): administration of a glucocorticoid and/or anesthetic via a needle into the epidural space between the ligamentum flavum and the dura.

PurposeNon-surgical treatment intended to reduce inflammation and radicular pain

Imaging guidanceCT or standard fluoroscopy can be used during administration to provide guidance and anatomic detail

Approaches — caudal, interlaminar, transforaminal

Approaches includedCaudal and interlaminar approaches (policy scope covers these approaches)

Other approach notedTransforaminal approach is recognized in clinical description but is covered under a separate policy (CP.MP.165)

Imaging expectationImaging guidance (CT or fluoroscopy) is generally expected for administration

Background and Rationale

Epidural steroid injections deliver a glucocorticoid and/or anesthetic into the epidural space via approaches such as caudal and interlaminar techniques. These procedures are used for radicular symptoms or neurogenic claudication unresponsive to conservative measures and are typically performed with imaging guidance (CT or fluoroscopy). Evidence on long‑term efficacy is mixed; some short‑term pain improvement may occur, but durability and safety beyond specified limits are uncertain.

Services Considered Not Medically Necessary

The following scenarios are not covered: 1) Third or subsequent caudal or interlaminar ESI for chronic pain that did not improve from the first two ESIs; 2) Continuation of injections beyond 12 months or more than four therapeutic injections per 12 months; and 3) Any other indication or location for caudal or interlaminar ESI not supported by established effectiveness.