M84.321 (Stress fracture, right humerus) compared with M84.329 (Stress fracture, unspecified humerus), from the official CMS tabular data. M84.321 and M84.329 code the same condition on opposite sides. MedCoder-derived
Same condition; these differ only in which side is documented.
These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.
Source: ICD-10-CM tabular list (laterality variant derived from the code title)
Same condition, opposite side. M84.321 and M84.329 name the same condition on opposite sides of the body.
Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.
| M84.321Stress fracture, right humerus | M84.329Stress fracture, unspecified humerus | |
|---|---|---|
| Billing status | Non-billable header Report instead: M84.321A, M84.321D, M84.321G, M84.321K, M84.321P | Non-billable header Report instead: M84.329A, M84.329D, M84.329G, M84.329K, M84.329P |
| Classification | M00-M99 — Diseases of the musculoskeletal system and connective tissue | M00-M99 — Diseases of the musculoskeletal system and connective tissue |
| Definition | Stress fracture, right humerus is a non-billable ICD-10-CM category code (M84.321). | Stress fracture, unspecified humerus is a non-billable ICD-10-CM category code (M84.329). |
| 7th character | The appropriate 7th character is to be added to each code from subcategory M84.3: | The appropriate 7th character is to be added to each code from subcategory M84.3: |
| Use additional code | external cause code(s) to identify the cause of the stress fracture | external cause code(s) to identify the cause of the stress fracture |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources