ICD-10-CM diagnosis code
S42.409K Unspecified fracture of lower end of unspecified humerus, subsequent encounter for fracture with nonunion
- Billable
- Yes, a complete code (FY2026)
Encounter (7th character)
This code is for a subsequent encounter: active treatment is complete and the patient is being seen during healing or recovery (for example a cast change, medication adjustment or follow-up visit).
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Other codes in S42
1398 complete codes in this category.
- S42.402PUnspecified fracture of lower end of left humerus, subsequent encounter for fracture with malunion
- S42.402SUnspecified fracture of lower end of left humerus, sequela
- S42.409AUnspecified fracture of lower end of unspecified humerus, initial encounter for closed fracture
- S42.409BUnspecified fracture of lower end of unspecified humerus, initial encounter for open fracture
- S42.409DUnspecified fracture of lower end of unspecified humerus, subsequent encounter for fracture with routine healing
- S42.409GUnspecified fracture of lower end of unspecified humerus, subsequent encounter for fracture with delayed healing
- S42.409KUnspecified fracture of lower end of unspecified humerus, subsequent encounter for fracture with nonunion
- S42.409PUnspecified fracture of lower end of unspecified humerus, subsequent encounter for fracture with malunion
- S42.409SUnspecified fracture of lower end of unspecified humerus, sequela
- S42.411ADisplaced simple supracondylar fracture without intercondylar fracture of right humerus, initial encounter for closed fracture
- S42.411BDisplaced simple supracondylar fracture without intercondylar fracture of right humerus, initial encounter for open fracture
- S42.411DDisplaced simple supracondylar fracture without intercondylar fracture of right humerus, subsequent encounter for fracture with routine healing
Documentation tips
- Make sure the note supports every element of the title, “Unspecified fracture of lower end of unspecified humerus, subsequent encounter for fracture with nonunion”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to S42.
The international WHO ICD-10 also has S42, with its inclusion and exclusion notes; titles and detail can differ from ICD-10-CM.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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