Pain Management Billing Services / 2026 Coverage Brief

The number that decides your facet claim is 4. Not the note.

Medicare's harmonized facet joint LCDs cap therapeutic sessions per spinal region per year, gate radiofrequency ablation behind two positive diagnostic blocks, and bundle the fluoroscopy you keep billing separately. Miss one cap and the denial is automatic, no reviewer required.

LCD L38773 / L39240 / L38801 NCCI PTP Edits v2026 CMS CY2026 PFS Final Rule CPT 64490-64636

The short answer

Across every MAC, the Facet Joint Interventions LCDs converge on the same math. Medicare will pay for no more than four therapeutic facet joint sessions per spinal region per rolling 12 months, no more than two regions treated in a single session, and radiofrequency ablation only after two diagnostic medial branch blocks each produced at least 80% relief. Repeat ablation of the same region is not payable sooner than six months, and never more than twice a year. When a payer denies a facet line, the cause is almost always one of those numbers, or an NCCI bundle you can see coming a mile away. This brief lays the caps out so your team can scrub the claim before the clearinghouse does.

01 / The caps, in numbers

Six figures your scrubber should enforce on day one

These thresholds are stated across the harmonized multi-MAC facet LCDs (Novitas L38773, Palmetto GBA L39240, NGS L38801, First Coast L38803, and the CGS and WPS equivalents). Cervical or thoracic and lumbar or sacral count as separate regions.

4 Max therapeutic sessions Per spinal region, per rolling 12 months. Session five denies on frequency.

2 Diagnostic blocks before RFA Dual medial branch blocks required to establish the target before ablation.

80% Relief threshold Each diagnostic block must document at least 80% concordant pain relief.

2 Regions per session No more than two facet joint regions may be treated on the same day.

6 Months between RFAs Repeat ablation of a region is not payable sooner than six months, max twice a year.

$0 Separate fluoro payment Imaging guidance is bundled into 64490-64495. Billing 77003 alongside is a PTP hit.

02 / The compliant pathway

What a payable facet-to-ablation sequence actually looks like

The LCDs do not just cap volume, they dictate order. Ablation billed without a documented pair of diagnostic blocks is the single most common medical-necessity denial in the space.

Visit 1 / Diagnostic block one

First medial branch block

Report the paravertebral facet nerve injection: 64490-64492 cervical/thoracic or 64493-64495 lumbar/sacral. Document baseline pain, then post-procedure relief. Below 80% relief, the pathway stops here.

Visit 2 / Diagnostic block two

Confirmatory second block

A second block on the same targets, again documenting at least 80% concordant relief. Two positive blocks are the coverage key that unlocks ablation. One block on file is not enough.

Visit 3 / Therapy

Radiofrequency ablation

Now bill the neurotomy: 64633-64634 cervical/thoracic or 64635-64636 lumbar/sacral. Same-day intraarticular injection of that joint will not be separately paid.

Month 6+ / Repeat

Repeat ablation, if indicated

Only after six months, only with documented return of at least 50% relief for a meaningful duration, and never more than twice per region per year. Attach the relief duration to the note or expect a frequency edit.

03 / Code map and MUE reality

The add-on levels are where units quietly overshoot

The third-and-beyond level codes (64492, 64495) are reported once per day regardless of how many additional levels you inject. Bilateral is modifier 50, not doubled units. Medically Unlikely Edits do the rest.

CPT	Service	Region	Watch-out
64490	Facet nerve injection, single level	Cervical / thoracic	MUE 1 Use mod 50 for bilateral
+64491	Second level (add-on)	Cervical / thoracic	MUE 1 Add-on only
+64492	Third and any additional levels	Cervical / thoracic	Once per day Regardless of level count
64493	Facet nerve injection, single level	Lumbar / sacral	MUE 1 Use mod 50 for bilateral
+64494	Second level (add-on)	Lumbar / sacral	MUE 1 Add-on only
+64495	Third and any additional levels	Lumbar / sacral	Once per day Regardless of level count
64633 / +64634	RF ablation, first / additional level	Cervical / thoracic	2 / region / yr Needs 2 prior blocks
64635 / +64636	RF ablation, first / additional level	Lumbar / sacral	2 / region / yr Needs 2 prior blocks
62321 / 62323	Epidural injection with imaging	Cervical / lumbar	Imaging already included, do not add 77003

04 / The bundles that deny you

NCCI already assumed the guidance is in the injection

The frequency caps get the attention, but a large share of preventable facet denials are Procedure-to-Procedure edits, not medical necessity. The fluoroscopy is the classic one.

What you billed

64493 lumbar facet injection
77003 fluoroscopic guidance
Both on the same date, same session

→PTP edit,
column two

What Medicare pays

64493 only. Guidance is bundled.
77003 denies as a component of the column-one code.
No modifier bypass. It is not a separate service.

Same logic catches intraarticular injection billed with same-level ablation, epidural steroid injection paired with a facet injection at the identical level, and paravertebral blocks stacked past their once-per-day add-on. NCCI edits carry modifier indicators, and a modifier 59 or an X-series modifier is only defensible when the documentation genuinely supports a separate site or session. On a facet claim, it rarely does.

05 / Denial autopsy

Four denials you can retire before they happen

CO-151 / Frequency

Fifth session in twelve months

Your rolling counter needs to track by region, not by patient. Session four in the lumbar region and session two in the cervical region can coexist. Session five in either does not.

CO-50 / Not medically necessary

Ablation without two documented blocks

The two 80% blocks must live in the record and be retrievable on audit. If the second block was done elsewhere, get the outside note before you bill the RFA.

CO-97 / Bundled

Fluoroscopy billed alongside

77003 with 64490-64495 is a component denial every time. Drop the guidance line at charge entry, not at appeal.

CO-B15 / Sequencing

Three regions in one session

Two regions per date is the ceiling. A third region on the same day is not payable and cannot be rescued with a modifier.

06 / Why the caps sting more in 2026

Lower conversion, same denials, thinner margin for rework

The CY2026 Medicare Physician Fee Schedule final rule finalized separate conversion factors for qualifying APM participants and everyone else, and interventional pain values move with the RVU updates in the same rule. When each facet line is worth a little less, a denied session you have to rework costs proportionally more of your margin to recover. The cheapest denial is the one your team never submits. Front-end frequency logic and NCCI scrubbing are where that gets won.

Turn the LCD caps into rules your claims obey automatically

ASP-RCM Solutions builds region-aware frequency tracking, dual-block validation, and NCCI edit logic into pain management billing workflows so facet and medial branch claims go out clean the first time. Let us scrub a sample of your denials and show you what is recoverable.

Book a facet denial review

Sources referenced: Medicare Local Coverage Determinations for Facet Joint Interventions for Pain Management (Novitas L38773, Palmetto GBA L39240, National Government Services L38801, First Coast Service Options L38803, and the corresponding CGS and WPS policies) and their billing and coding articles; the National Correct Coding Initiative (NCCI) Procedure-to-Procedure edits and MUE tables effective 2026; the CMS Calendar Year 2026 Medicare Physician Fee Schedule final rule; and AMA CPT descriptors for codes 64490-64636 and 62320-62327. Coverage terms vary by MAC jurisdiction and are updated periodically. Confirm the active LCD, article revision, and edit file for your region and date of service before billing. This brief is coding and reimbursement guidance, not clinical or legal advice.