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M84.321Non-billableSave

M84.321 - Stress fracture, right humerus

ICD-10-CM Chapter 13: Diseases of the musculoskeletal system and connective tissue · M80-M85 Disorders of bone density and structure (M80-M85) · Subcategory of M84.32 · FY2027

Coding Guidance

M84.321 requires a 7th character. Report the code below that matches the documentation, for example A for initial encounter for fracture, D for subsequent encounter for fracture with routine healing, G for subsequent encounter for fracture with delayed healing.

7th Character

The appropriate 7th character is to be added to each code from subcategory M84.3:

Includes, Excludes and Coding Notes

Excludes 1 — Not Coded HereFrom M84.3

Mutually exclusive: these conditions are never reported together with this code.

  • pathological fracture NOS (M84.4.-)
  • pathological fracture due to osteoporosis (M80.-)
  • traumatic fracture (S12.-, S22.-, S32.-, S42.-, S52.-, S62.-, S72.-, S82.-, S92.-)
Excludes 2 — Not Included HereFrom M84.3

Not part of this code; report both codes when the patient has both conditions.

  • personal history of (healed) stress (fatigue) fracture (Z87.312)
  • stress fracture of vertebra (M48.4-)
Use Additional CodeFrom M84.3

Add a secondary code to identify the associated condition or cause when it is documented.

  • external cause code(s) to identify the cause of the stress fracture
Excludes 2 — Not Included HereFrom M84

Not part of this code; report both codes when the patient has both conditions.

  • traumatic fracture of bone-see fracture, by site
Excludes 2 — Not Included HereFrom Chapter M00-M99

Not part of this code; report both codes when the patient has both conditions.

  • arthropathic psoriasis (L40.5-)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • compartment syndrome (traumatic) (T79.A-)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
NotesFrom Chapter M00-M99

Instructional notes from the ICD-10-CM tabular list.

  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

More Specific Codes (6)

M84.321AStress fracture, right humerus, initial encounter for fracture→M84.321DStress fracture, right humerus, subsequent encounter for fracture with routine healing→M84.321GStress fracture, right humerus, subsequent encounter for fracture with delayed healing→M84.321KStress fracture, right humerus, subsequent encounter for fracture with nonunion→M84.321PStress fracture, right humerus, subsequent encounter for fracture with malunion→M84.321SStress fracture, right humerus, sequela→

Related condition guides

Documentation requirements, coding pitfalls and FAQs for conditions coded with M84.321.