Glossary · Clinical
PLIF (posterior lumbar interbody fusion)
PLIF (posterior lumbar interbody fusion) is a spinal fusion technique in which the surgeon accesses the lumbar disc space from the back of the spine, removes the damaged disc, and inserts an interbody spacer or cage to fuse two adjacent vertebrae into a single solid segment.
Verified May 8, 2026 · 9 sources ↓
Definition
Source · Editorial summary grounded in 9 cited references ↓
In a PLIF, the surgeon makes a midline posterior incision, removes the lamina to gain access to the spinal canal, and retracts the nerve roots to reach the disc space. The damaged disc is excised, the vertebral endplates are prepared, and one or two interbody cages—made of metal, PEEK plastic, or bone—are impacted into the cleared space. Bone graft material packed around or inside the cage promotes osseous healing across the interspace. Pedicle screws and connecting rods are typically added to stabilize the construct while fusion occurs.
PLIF is one of five main lumbar interbody fusion approaches alongside TLIF, ALIF, LLIF, and OLIF. Its defining characteristic is bilateral nerve root retraction, which gives the surgeon direct midline access to the full disc space but also carries a somewhat higher risk of nerve root manipulation compared with the more lateral transforaminal (TLIF) corridor. No approach has demonstrated clear superiority in fusion or clinical outcomes; choice is driven by patient anatomy, pathology, and surgeon experience.
Common indications include degenerative disc disease, spondylolisthesis, spinal stenosis, recurrent disc herniation, and spinal instability causing mechanical low back pain or radiculopathy that has not responded to conservative management. CMS LCD L37848 recognizes these indications for Medicare coverage when documentation supports medical necessity.
Why it matters
Accurate identification of PLIF versus TLIF determines which CPT code anchors the claim: 22630 (posterior interbody arthrodesis, single lumbar interspace) for a PLIF, versus 22633 (combined posterior/posterolateral with posterior interbody, single interspace) when a posterolateral component is bundled in. Using the wrong primary code—or failing to add the correct add-on codes (e.g., +22632 for each additional interspace, +22840 or +22842 for instrumentation, +22853 for an interbody cage with integrated fixation)—results in undercoding, overbilling, or NCCI edit denials. Medicare's NCCI policy further bundles the decompression (laminectomy) work into the interbody fusion code, meaning separately billing 63047 alongside 22630 without a valid modifier 59 will trigger an automatic edit and payment reduction. Getting the procedure type right is the first step in building a defensible, fully reimbursed claim.
Common mistakes
Where people most often go wrong with this concept.
Source · Editorial brief grounded in cited references ↓
- Billing CPT 22633 instead of 22630 when the operative report documents only a posterior interbody approach without a distinct posterolateral arthrodesis component.
- Reporting laminectomy code 63047 alongside 22630 without modifier 59 when the laminotomy was performed solely to access the disc space—NCCI bundles this work into the fusion code.
- Using modifier 59 on the decompression code when the laminectomy is not a separately identifiable decompression performed at a different level or for a different clinical purpose; this does not overcome the NCCI bundle and may trigger an audit.
- Forgetting add-on code +22632 when fusion is performed at more than one lumbar interspace during the same session.
- Omitting or mis-selecting the instrumentation add-on (e.g., using +22840 for non-segmental when segmental pedicle screw fixation across the fused interspace requires +22842).
- Failing to document that non-operative treatment was tried and failed before surgery, which is required to meet medical necessity under CMS LCD L37848 and most commercial LCDs.
- Conflating PLIF with TLIF in the operative note summary—coders must read the body of the operative report to confirm bilateral versus unilateral disc access before selecting the CPT code.
Related codes
Codes commonly involved when this concept appears in practice.
CPT
- 22630 $1,510.72Posterior interbody arthrodesis of a single lumbar interspace, including laminectomy and/or discectomy performed to prepare the interspace for fusion rather than for decompression.
- 22632 $287.58Add-on code for posterior interbody lumbar arthrodesis at each additional interspace beyond the first, including any laminectomy or discectomy needed to prepare the interspace.
- 22633 $1,700.11Single-level lumbar arthrodesis combining posterior or posterolateral technique with posterior interbody technique, including laminectomy and/or discectomy sufficient to prepare the interspace — performed as one surgical session at one lumbar interspace.
- 22614 $349.37Add-on code for each additional interspace treated by posterior or posterolateral arthrodesis beyond the first level billed with a primary fusion code.
- 22840 $668.35Posterior non-segmental instrumentation placed during spinal surgery, using rods, hooks, or wires that span multiple vertebral levels without anchoring at each intervening segment.
- 22842 $680.04Posterior segmental spinal instrumentation spanning 3 to 6 vertebral segments, reported as an add-on to the primary spinal procedure code.
- 22853 $228.80Add-on code for inserting an interbody biomechanical device (e.g., synthetic cage or mesh) with integral anterior anchoring instrumentation into an intervertebral disc space, performed alongside interbody arthrodesis, reported once per interspace.
- 63047 $1,065.49Lumbar laminectomy at a single vertebral segment that also includes facetectomy and foraminotomy for decompression of the spinal cord, cauda equina, and/or nerve roots — unilateral or bilateral.
Frequently asked questions
Source · Generated from the editorial pipeline, verified against 9 cited references ↓
01What is the difference between PLIF and TLIF?
02Which CPT code represents a single-level PLIF?
03Can laminectomy and PLIF be billed together?
04What ICD-10 codes most commonly support PLIF medical necessity?
05Does Medicare cover PLIF for degenerative disc disease without spondylolisthesis?
06How should the interbody cage be coded for a PLIF?
Sources & references
Editorial content was developed using the following public sources. Last verified May 8, 2026.
- 01orthoinfo.aaos.orghttps://orthoinfo.aaos.org/en/treatment/spinal-fusion-plif-tlif/
- 02cms.govhttps://www.cms.gov/medicare-coverage-database/view/lcd.aspx?lcdid=37848&ver=18
- 03cms.govhttps://www.cms.gov/medicare-coverage-database/view/article.aspx?articleid=56396
- 04pmc.ncbi.nlm.nih.govhttps://pmc.ncbi.nlm.nih.gov/articles/PMC5039869/
- 05aapc.comhttps://www.aapc.com/blog/35437-spine-surgery-quandary-posterior-lumbar-interbody-fusion/
- 06gohealthcarellc.comhttps://www.gohealthcarellc.com/blog/billing-and-coding-lumbar-spinal-fusion-plif-tlif-alif-dlif-olif-and-instrumentation
- 07healthcareinspiredllc.comhttps://healthcareinspiredllc.com/fusion-confusion-cpt-coding-made-simple-for-spinal-fusions/
- 08CMS NCCI Policy Manual, Chapter 8 (effective Jan. 1, 2015)
- 09Mobbs RJ et al. J Spine Surg. 2015;1(1):2-18 (cited in CMS LCD L37848)
Mira AI Scribe
When Mira detects PLIF language in an operative note, it flags the following documentation and code-selection checkpoints: 1. APPROACH CONFIRMATION — Confirm the note describes a posterior midline incision with bilateral nerve root retraction and direct midline disc access. If the disc was reached through the foramen (unilateral retraction), the correct code is 22633-series (TLIF), not 22630. 2. INTERSPACE COUNT — Count distinct disc levels treated. Report 22630 for the first interspace; append +22632 for each additional interspace at the same session. 3. DECOMPRESSION BUNDLING — If laminotomy/laminectomy was performed solely to expose the disc for fusion, it is bundled into 22630 per NCCI policy. Do not separately report 63047 unless a distinct, separately documented decompression was performed at a different level for neural decompression independent of the fusion approach. 4. CAGE / INTERBODY DEVICE — Report +22853 if the operative note documents placement of a stand-alone interbody device with integrated fixation. For a standard cage without integral instrumentation, the device is captured within 22630; confirm with payer policy. 5. INSTRUMENTATION — Add +22842 (segmental pedicle screw fixation, 3–6 vertebral segments) or +22840 (non-segmental) based on the number of fixation points documented. Do not select by assumption—read the implant count in the operative report. 6. BONE GRAFT — Autograft harvested from a separate iliac crest site adds +20937 or +20938; local autograft (lamina/spinous process) and allograft are typically bundled. 7. MEDICAL NECESSITY ANCHOR — Attach the ICD-10 code that reflects the primary pathology driving surgery (e.g., M51.16 for lumbar disc degeneration, M43.16 for lumbar spondylolisthesis). Ensure the diagnosis is supported by imaging findings and documented failure of conservative care per LCD L37848.
See Mira's approachRelated terms
TLIF (transforaminal lumbar interbody fusion) is a posterior spinal surgery in which the surgeon accesses the disc space through the foramen to remove disc material and pack a cage with bone graft between two lumbar vertebrae, achieving both decompression and fusion from a single posterior approach. It is reported primarily with CPT 22630 for a single interspace, with add-on codes for each additional level.
ALIF (anterior lumbar interbody fusion) is a spinal fusion procedure that accesses the lumbar disc space through an incision in the abdomen, removes the damaged disc, and packs the interspace with bone graft or an interbody device to promote vertebral fusion. It is coded primarily with CPT 22558 and ICD-10-PCS 0SG00A0 for single-level lumbar fusion via open anterior approach.
OLIF (oblique lumbar interbody fusion) is a minimally invasive spinal fusion technique that approaches the lumbar disc space through an oblique, anterolateral corridor between the abdominal vessels and the psoas muscle, avoiding direct muscle splitting and reducing nerve-injury risk compared with purely lateral or posterior approaches.
A laminectomy is the surgical removal of all or most of the lamina (the posterior arch of a vertebra) to decompress the spinal cord or nerve roots. It is more extensive than a laminotomy, which removes only a portion of the lamina.
Discectomy is a surgical procedure that removes all or part of a herniated or damaged intervertebral disc to relieve pressure on spinal nerve roots or the spinal cord. In coding, the correct CPT code depends on spinal level, approach, and whether decompression is performed beyond what is intrinsic to an associated fusion procedure.
Spinal stenosis is narrowing of the spinal canal, lateral recesses, or neural foramina that compresses the spinal cord or nerve roots. In ICD-10-CM, the condition is captured under the M48.0– category, with lumbar-region codes further split by the presence or absence of neurogenic claudication.
Spondylolisthesis is a spinal condition in which one vertebra slips forward (anterolisthesis) or, less commonly, backward (retrolisthesis) relative to the vertebra below it. It most often occurs at L4–L5 or L5–S1 and ranges in severity from mild instability to frank neurologic compromise.