Pain Management Billing Services

Facet and Epidural Injection Frequency Limits: The 2026 LCDs Pain Practices Cannot Ignore

Your Medicare Administrative Contractor does not pay by the calendar year. It pays by the anatomic region, by the rolling 12 months, and by whether the last block actually worked. Miss any one of those and the line denies.

The short answer: under the coordinated MAC Local Coverage Determinations for Facet Joint Interventions and Epidural Steroid Injections, a region gets 2 diagnostic facet sessions ever to qualify for ablation, no more than 2 levels per session, and no more than 4 epidural sessions per rolling 12 months. Everything past that ceiling is a write-off unless the chart proves response.

2Diagnostic facet sessions / region to earn RFA

2Levels reportable per session per region

4Epidural sessions / region / rolling 12 mo

≥50%Documented relief required before any repeat

Know the codes you are capping

The eleven codes the LCDs actually police

Facet joint nerve blocks and injections run 64490 to 64495. Interlaminar and caudal epidurals run 62321 to 62327. The add-on codes are where over-billing hides, because a third level is easy to append and hard to defend.

64490Cervical/thoracic facet, single level

64491Cervical/thoracic, second level

64492Cervical/thoracic, third+ (rarely covered)

64493Lumbar/sacral facet, single level

64494Lumbar/sacral, second level

64495Lumbar/sacral, third+ (rarely covered)

62321Cervical/thoracic interlaminar epidural, w/ imaging

62323Lumbar/sacral interlaminar/caudal, w/ imaging

62325Cervical/thoracic interlaminar, no imaging

62327Lumbar/sacral interlaminar/caudal, no imaging

The per-region, per-year checklist

Four cards. Check every box before the claim goes out.

The LCDs treat cervical-thoracic and lumbar-sacral as two separate regions, each with its own counters. Run this checklist per region, not per patient, before you bill.

Diagnostic Facet / Medial Branch

Dx block

64490 / 64491 / 64493 / 64494

No more than 2 diagnostic sessions per region, total, to establish a candidate for radiofrequency ablation.
No more than 2 levels reported per session per region. The third-level add-ons 64492 / 64495 are generally not reasonable and necessary.
Dual comparative blocks with ≥80% relief concordant with the anesthetized nerve is the ASIPP-aligned bar for a positive result.
Do not bill a therapeutic intra-articular facet injection as the repeat. The LCDs steer to block then ablate, not a standing injection series.

Radiofrequency Ablation Repeat

Therapeutic

64633 / 64634 / 64635 / 64636 pathway

RFA only after two positive diagnostic blocks in that region. No blocks on file, no ablation coverage.
Repeat ablation at the same level no sooner than 6 months, and no more than 2 per region per rolling 12 months.
Repeat requires documented ≥50% relief for at least 3 months from the prior ablation. Duration and percentage both in the note.
Do not report a diagnostic block and the ablation at the same level, same session. They collapse into one payable service.

Epidural Steroid Injection

Interlaminar / caudal

62321 / 62323 / 62325 / 62327

No more than 4 epidural sessions per region per rolling 12 months, all approaches combined.
One interlaminar or caudal epidural per session. Two same-day epidurals in one region is not a covered pattern.
A repeat is earned by ≥50% relief that is documented, not assumed. Response drives the next injection.
A pre-scheduled series of three without a measured response between injections is not reasonable and necessary.

Documentation That Holds Up

Chart gate

applies to every code above

Pre and post procedure pain scores, percent relief, and duration of relief for every repeat.
Failure of at least 4 weeks of conservative care before the first injection in the episode.
Imaging guidance is documented. 62321 and 62323 already include it, so do not stack a separate guidance code.
ICD-10 support that matches the covered diagnosis list in the paired Billing and Coding Article, per region.

The one covered pathway

Block, confirm, ablate. Not inject, inject, inject.

The facet LCDs describe a diagnostic-to-therapeutic sequence. Skip a gate and the whole downstream chain becomes non-covered, even when the ablation itself was clinically right.

First diagnostic block

Medial branch block, up to 2 levels in the region.

GATE: ≥80% concordant relief

Confirmatory block

Second block, the last diagnostic session this region will ever cover.

GATE: response repeated

Radiofrequency ablation

Neurotomy of the confirmed levels once the blocks agree.

GATE: ≥50% relief, 3+ mo

Third+ block or unearned repeat

No new blocks to re-qualify, no early re-ablation.

STOP: not covered

The ceiling on one page

Frequency limits at a glance

Service	Codes	Per-session limit	Rolling 12-month ceiling	Repeat condition
Diagnostic facet / MBB	64490-64494	2 levels per region	2 sessions per region (to qualify RFA)	Concordant relief on dual blocks
Third-level facet add-on	64492 / 64495	Generally not covered	0	Not reasonable and necessary
Radiofrequency ablation	64633-64636	Confirmed levels only	2 per region	≥50% relief for ≥3 months, ≥6 months apart
Interlaminar / caudal ESI	62321-62327	1 epidural per region	4 per region	Documented ≥50% relief from prior

Where the money leaks

The patterns that quietly cross the ceiling

A busy mid-size pain group, call them the archetype, rarely bills one wild claim. It bills the same small overage a hundred times.

The third level habit

64492 or 64495 appended out of routine. It is not a coding tweak, it is a non-covered level that drags the whole session into review.

Region counted as calendar

Counting a fifth epidural because it is a new year, when the rolling 12-month window is still open. The LCD clock does not reset in January.

Series billed on autopilot

A standing series of three epidurals with no relief documented between them. Injections two and three have no coverage footing.

Ablation without blocks

RFA billed where the two diagnostic blocks never made it into the record. Clinically defensible, contractually deniable.

Percentage without duration

Notes that say improved but never state ≥50% and how long it lasted. The repeat fails on documentation, not on care.

Guidance stacked twice

Billing imaging guidance separately alongside 62321 or 62323, which already bundle it. A clean unbundling flag.

Cited by name

What these limits actually come from

CMS MAC Local Coverage Determination: Facet Joint Interventions for Pain Management, the coordinated policy carried by Novitas Solutions, First Coast, CGS Administrators, Noridian Healthcare Solutions, National Government Services, Palmetto GBA, and WPS, with its paired Billing and Coding Article for utilization and ICD-10 support.
CMS MAC Local Coverage Determination: Epidural Steroid Injections for Pain Management, the matching multi-contractor policy governing 62321-62327 session frequency and the documented-response requirement for repeats.
ASIPP (American Society of Interventional Pain Physicians) evidence-based guidelines for facet joint interventions and epidural injections, the source of the dual-block, ≥80% concordant relief standard the LCDs echo.
CY 2026 Medicare Physician Fee Schedule Final Rule for the payment and RVU context that sits underneath every one of these codes.

MAC LCDs are contractor-specific and revised on their own schedule. Confirm the exact LCD number, effective date, and covered ICD-10 list for the contractor that processes your claims before you set an internal edit.

Stop billing past the covered ceiling

We build these per-region, per-year frequency edits straight into your pain-management billing workflow, so the third level, the reset calendar, and the unearned repeat get caught before submission, not after the denial. Fewer takebacks, cleaner post-pay audits, faster cash.

Get a facet and epidural billing review Talk to a pain-management RCM specialist

ASP-RCM Solutions // Pain Management Billing Services