S43.419A Sprain of unspecified coracohumeral (ligament), initial encounter

ICD-10-CM S43.419A: Sprain of unspecified coracohumeral (ligament), initial encounter

ICD-10-CM code S43.419A identifies an initial encounter for a sprain of an unspecified coracohumeral ligament, classified as an injury or poisoning concept. This reference synthesizes official terminology records and clinical literature to explain the code's structure, its parent hierarchy, and general clinical context regarding ligament injuries. 1 2

Plain-language overview

Code S43.419A is an active ICD-10-CM terminology record representing a sprain of an unspecified coracohumeral ligament during an initial encounter, providing a standardized label for this specific injury. 1

What this code represents

The semantic type assigned to S43.419A is Injury or Poisoning, and the code belongs to the parent concept S43.419 for a sprain of an unspecified coracohumeral ligament. 1

The terminology record for S43.419A includes an abbreviation noting an initial encounter and indicates that this concept has narrower concepts within the ICD-10-CM terminology. 1

Clinical context

Clinical literature establishes that tendon and ligament injuries occur frequently in the general population, contributing to high health care costs and patient morbidity. 2

Anatomical literature notes that the coracohumeral ligament, identified as the comma sign, retracts in junction with the supero-lateral border of the retracted subscapularis tendon. 2

Documentation considerations

A Medicare billing article lists related coracohumeral ligament sprain codes, including S43.412S for a left subsequent encounter and S43.421A for a right rotator sprain, providing context for differentiating specific injuries. 3

Coverage and utilization context

A Medicare billing and coding article includes coracohumeral ligament sprain codes within a broader list addressing injections for tendons, ligaments, ganglion cysts, tunnel syndromes, and Morton's neuroma. 3

What the sources add

While the official terminology record provides the exact code hierarchy and label for S43.419A, the clinical literature provides general anatomical context regarding the coracohumeral ligament without defining the target code. 1 2

The Medicare article provides operational billing context by listing related coracohumeral sprain codes, whereas the official terminology record confirms the exact active status and parent concept for S43.419A. 1 3

Sources

1. ICD-10-CM S43.419A terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Advances in Muscles, Ligaments and Tendons — 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.