S80.842 External constriction, left lower leg

ICD-10-CM Diagnosis Code S80.842: External constriction, left lower leg

ICD-10-CM code S80.842 identifies external constriction of the left lower leg and is classified under the broader parent concept for lower leg constriction. The concept is active for the 2026 version and is categorized as an injury or poisoning diagnosis. A CMS billing article lists a more specific initial encounter variant for this condition. 1 3

Plain-language overview

Code S80.842 identifies a diagnosis of external constriction specifically located on the left lower leg, and the terminology record is active for the 2026 version of the ICD-10-CM system. 1

What this code represents

The diagnosis S80.842 is assigned the semantic type of Injury or Poisoning, and it rolls up to the parent concept S80.84 for external constriction of the lower leg. 1

Coding details

The S80.842 terminology record indicates that this code has no narrower child concepts within the ICD-10-CM hierarchy, and its published abbreviation matches its preferred name. 1

A CMS billing and coding article identifies S80.842A as the initial encounter variant for external constriction of the left lower leg, adding encounter specificity to the base code. 3

Documentation considerations

Clinical documentation for the S80.842A variant specifies an initial encounter for external constriction of the left lower leg, as listed within a CMS wound care billing and coding article. 3

Clinical context

A clinical review distinguishes direct muscle injuries, often resulting from external forces, from indirect stretch-induced injuries occurring during a sudden forced lengthening over viscoelastic limits. 2

What the sources add

The terminology record establishes the code hierarchy and semantic type, while the CMS billing article includes the initial encounter variant of this diagnosis within a wound care article list. 1 3

A clinical review discusses lower limb muscle injuries and external forces, but the terminology record for S80.842 does not incorporate these clinical injury mechanisms into its code definition. 2 1

Coverage and utilization context

The S80.842A code appears in a CMS wound care billing and coding article, and the supplied source text does not specify payer coverage rules or reimbursement conditions for this diagnosis. 3

Sources

1. ICD-10-CM S80.842 terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Indirect Structural Muscle Injuries of Lower Limb: Rehabilitation and Therapeutic Exercise — pmc.ncbi.nlm.nih.gov; accessed 2026-07-27.
3. Article - Billing and Coding: Wound Care (A55909) — cms.gov; accessed 2026-07-27.