ICD-10-CM diagnosis code
M84.329K Stress fracture, 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 M84
928 complete codes in this category.
- M84.322KStress fracture, left humerus, subsequent encounter for fracture with nonunion
- M84.322PStress fracture, left humerus, subsequent encounter for fracture with malunion
- M84.322SStress fracture, left humerus, sequela
- M84.329AStress fracture, unspecified humerus, initial encounter for fracture
- M84.329DStress fracture, unspecified humerus, subsequent encounter for fracture with routine healing
- M84.329GStress fracture, unspecified humerus, subsequent encounter for fracture with delayed healing
- M84.329KStress fracture, unspecified humerus, subsequent encounter for fracture with nonunion
- M84.329PStress fracture, unspecified humerus, subsequent encounter for fracture with malunion
- M84.329SStress fracture, unspecified humerus, sequela
- M84.331AStress fracture, right ulna, initial encounter for fracture
- M84.331DStress fracture, right ulna, subsequent encounter for fracture with routine healing
- M84.331GStress fracture, right ulna, subsequent encounter for fracture with delayed healing
Documentation tips
- Make sure the note supports every element of the title, “Stress fracture, 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 M84.
The international WHO ICD-10 also has M84, 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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