S33.140 Subluxation of L4/L5 lumbar vertebra

ICD-10-CM Code S33.140: Subluxation of L4/L5 lumbar vertebra

ICD-10-CM code S33.140 is an active terminology record with the preferred name subluxation of L4/L5 lumbar vertebra. It is assigned the semantic type of injury or poisoning and has no narrower child concepts. The code appears in a Medicare lumbar spinal fusion billing article alongside encounter variants. 1 3 4

Plain-language overview

The active terminology record for S33.140 carries the preferred name subluxation of L4/L5 lumbar vertebra and is assigned the semantic type of injury or poisoning within ICD-10-CM version 2026. 1 4

What this code represents

Code S33.140 represents subluxation of L4/L5 lumbar vertebra and exists as a concept with no narrower child concepts under the parent concept S33.14 for subluxation and dislocation of L4/L5 lumbar vertebra. 1

Coding details

A Medicare billing article for lumbar spinal fusion lists S33.140D for an initial encounter and S33.140S for a subsequent encounter as extensions of the subluxation of L4/L5 lumbar vertebra code. 3

Documentation considerations

A Medicare billing article for lumbar spinal fusion lists S33.140D for an initial encounter and S33.140S for a subsequent encounter, providing specific extension variants for the base S33.140 code. 3

Coverage and utilization context

The S33.140D and S33.140S variants appear within a Medicare article titled Billing and Coding: Lumbar Spinal Fusion, situating the diagnosis code within an administrative payment and coding document. 3

Clinical context

Clinical literature describes degenerative lumbar spondylolisthesis as an acquired condition associated with age-related degenerative changes but no defect or disruption in the vertebral ring. 2

In symptomatic patients with degenerative lumbar spondylolisthesis, the clinical presentation can vary and includes a combination of lower back pain, lower limb radiculopathy, and neurogenic claudication. 2

What the sources add

Terminology records from the National Cancer Institute and EVS Explore establish the official preferred name, active status, and parent concept for S33.140, while a Medicare billing article lists its encounter extensions. 1 3 4

The terminology record assigns S33.140 the semantic type of injury or poisoning, whereas the clinical literature source describes the presentation and acquired nature of degenerative lumbar spondylolisthesis. 1 2

Sources

1. ICD-10-CM S33.140 terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Management of symptomatic degenerative low-grade lumbar spondylolisthesis — pmc.ncbi.nlm.nih.gov; accessed 2026-07-27.
3. Article - Billing and Coding: Lumbar Spinal Fusion (A56396) — cms.gov; accessed 2026-07-27.
4. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-27.