S03.42XA Sprain of jaw, left side, initial encounter

ICD-10-CM S03.42XA: Sprain of jaw, left side, initial encounter

ICD-10-CM code S03.42XA identifies a sprain of the left jaw during an initial encounter, classified under the semantic type of injury or poisoning. This active terminology record is distinct from subsequent encounter and sequela codes, and it appears in payer billing articles alongside related jaw sprain codes. 1 3 5

Plain-language overview

ICD-10-CM code S03.42XA is an active terminology concept representing a sprain of the left side of the jaw during an initial encounter, providing a standardized label for this specific injury. 1

What this code represents

The code S03.42XA is assigned the semantic type of injury or poisoning and has a parent concept of S03.42, which denotes a general sprain of the left jaw without specifying the encounter. 1

Coding details

The S03.42XA code is distinct from S03.42XD for a subsequent encounter and S03.42XS for a sequela, establishing a specific timeline for the left jaw sprain. 4 5

While S03.42XA specifies a left jaw sprain initial encounter, the related code S03.41XD specifies a right jaw sprain subsequent encounter, demonstrating laterality distinctions within the coding structure. 3

Documentation considerations

Terminology records define S03.42XA as a sprain of the left side of the jaw, and billing articles list distinct codes for right-sided sprains, highlighting the necessity of laterality in code selection. 1 3

Clinical context

Goals for initial treatment of posttraumatic temporomandibular joint injuries include achieving pretraumatic function, restoring facial symmetry, and resolving pain. 2

Coverage and utilization context

The S03.42XA code appears in a Medicare billing and coding article for injections, demonstrating its operational use in payer documents alongside other sprain codes. 5

What the sources add

Terminology records establish the official active label and parent hierarchy for S03.42XA, while billing articles demonstrate the code's operational appearance alongside related right-sided and sequela codes. 1 3

A clinical source details functional problems from temporomandibular joint trauma, such as limited opening and deviation, whereas terminology sources strictly define the code without clinical symptoms. 1 2

Sources

1. ICD-10-CM S03.42XA terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Posttraumatic Temporomandibular Joint Disorders — pmc.ncbi.nlm.nih.gov; accessed 2026-07-27.
3. Article - Billing and Coding: Injections - Tendon, Ligament, Ganglion Cyst, Tunnel Syndromes and Morton's Neuroma (A57079) — cms.gov; accessed 2026-07-27.
4. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-27.
5. Article - Billing and Coding: Injections - Tendon, Ligament, Ganglion Cyst, Tunnel Syndromes and Morton's Neuroma (A57079) — cms.gov; accessed 2026-07-27.