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ICD-10-CM · FY 2026 APRIL UPDATE

S20.34

External constriction of front wall of thorax

Diagnosis reference

Nonbillable category

This entry is a category or subcategory. Choose the appropriate billable descendant based on the clinical documentation.

Effective periodOctober 1, 2026–September 30, 2027
SourceCMS ICD-10-CM order file
ClassificationDiagnosis · clinical modification

Related entries

Up to 30 descendants in this category

CODEDESCRIPTIONTYPE
S20.341External constriction of right front wall of thoraxCategory
S20.341AExternal constriction of right front wall of thorax, initial encounterBillable
S20.341DExternal constriction of right front wall of thorax, subsequent encounterBillable
S20.341SExternal constriction of right front wall of thorax, sequelaBillable
S20.342External constriction of left front wall of thoraxCategory
S20.342AExternal constriction of left front wall of thorax, initial encounterBillable
S20.342DExternal constriction of left front wall of thorax, subsequent encounterBillable
S20.342SExternal constriction of left front wall of thorax, sequelaBillable
S20.343External constriction of bilateral front wall of thoraxCategory
S20.343AExternal constriction of bilateral front wall of thorax, initial encounterBillable
S20.343DExternal constriction of bilateral front wall of thorax, subsequent encounterBillable
S20.343SExternal constriction of bilateral front wall of thorax, sequelaBillable
S20.344External constriction of middle front wall of thoraxCategory
S20.344AExternal constriction of middle front wall of thorax, initial encounterBillable
S20.344DExternal constriction of middle front wall of thorax, subsequent encounterBillable
S20.344SExternal constriction of middle front wall of thorax, sequelaBillable
S20.349External constriction of unspecified front wall of thoraxCategory
S20.349AExternal constriction of unspecified front wall of thorax, initial encounterBillable
S20.349DExternal constriction of unspecified front wall of thorax, subsequent encounterBillable
S20.349SExternal constriction of unspecified front wall of thorax, sequelaBillable

Use the complete reference

This reference does not reproduce the full tabular hierarchy, inclusion notes, Excludes1/2 notes, sequencing instructions, or seventh-character rules. Review the official tables and coding guidelines.

Open official CMS files

ICD-10-CM codes describe diagnoses. They do not have an independent Medicare PFS reimbursement amount, and billability alone does not establish coverage.