ICD-10-CM diagnosis code
S40.921S Unspecified superficial injury of right upper arm, sequela
- Billable
- Yes, a complete code (FY2026)
Encounter (7th character)
This code is for a sequela: a complication or condition that arises as a direct result of the injury. The sequela itself is usually coded first, followed by this code.
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Other codes in S40
144 complete codes in this category.
- S40.912SUnspecified superficial injury of left shoulder, sequela
- S40.919AUnspecified superficial injury of unspecified shoulder, initial encounter
- S40.919DUnspecified superficial injury of unspecified shoulder, subsequent encounter
- S40.919SUnspecified superficial injury of unspecified shoulder, sequela
- S40.921AUnspecified superficial injury of right upper arm, initial encounter
- S40.921DUnspecified superficial injury of right upper arm, subsequent encounter
- S40.921SUnspecified superficial injury of right upper arm, sequela
- S40.922AUnspecified superficial injury of left upper arm, initial encounter
- S40.922DUnspecified superficial injury of left upper arm, subsequent encounter
- S40.922SUnspecified superficial injury of left upper arm, sequela
- S40.929AUnspecified superficial injury of unspecified upper arm, initial encounter
- S40.929DUnspecified superficial injury of unspecified upper arm, subsequent encounter
Documentation tips
- Make sure the note supports every element of the title, “Unspecified superficial injury of right upper arm, sequela”: 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 S40.
The international WHO ICD-10 also has S40, 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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