2026 ICD-10-CM Diagnosis Code M84.329DStress fracture, unspecified humerus, subsequent encounter for fracture with routine healing
M84.329D is a billable ICD-10-CM diagnosis code for stress fracture, unspecified humerus, subsequent encounter for fracture with routine healing. The 7th character D marks it as a subsequent encounter code, used during routine care in the healing or recovery phase. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 559 through 561. Coders also document this condition as stress fracture of humerus. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Stress fracture, subsequent encounter.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Stress fracture of humerus
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Arm Injuries and Disorders
Of the 206 bones in your body, three of them are in your arm: the humerus, radius, and ulna. Your arms are also made up of muscles, joints, tendons, and other connective tissue. Injuries to any of these parts of the arm can occur during sports, a fall, or an accident.
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Convert M84.329D to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About M84.329DOverview
Is M84.329D (Stress fracture, unspecified humerus) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report stress fracture, unspecified humerus, subsequent encounter for fracture with routine healing on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character D in M84.329D mean?
The final character D marks a subsequent encounter: use it for routine care while the stress fracture, unspecified humerus is healing, after active treatment has ended.
What MS-DRG does M84.329D group to?
When stress fracture, unspecified humerus, subsequent encounter for fracture with routine healing is the principal diagnosis on an inpatient stay, it groups to MS-DRG 559, 560, 561, with relative weights from 0.8039 to 1.8649 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of M84.329D?
Under the General Equivalence Mappings, stress fracture, unspecified humerus, subsequent encounter for fracture with routine healing converts to ICD-9-CM V54.21 (aftercare path fx up arm). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
