2026 ICD-10-CM Diagnosis Code M84.522SPathological fracture in neoplastic disease, left humerus, sequela
ICD-10-CM Codes›M00–M99›M80-M85›M84
- Billable — Valid for Submission
- 7th Character S — Sequela
- Chronic Condition
M84.522S is a billable ICD-10-CM diagnosis code for pathological fracture in neoplastic disease, left humerus, sequela. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. 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 pathological fracture - upper arm. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Pathological, stress and atypical fractures, sequela.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Pathological fracture - upper arm
- Pathological fracture of left humerus
- Pathological fracture of left humerus due to neoplasm
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 M84.522S to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About M84.522SOverview
Is M84.522S (Pathological fracture in neoplastic disease, left humerus) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report pathological fracture in neoplastic disease, left humerus, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in M84.522S mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the pathological fracture in neoplastic disease, left humerus itself has resolved, not the original event.
What MS-DRG does M84.522S group to?
When pathological fracture in neoplastic disease, left humerus, sequela 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 M84.522S?
Under the General Equivalence Mappings, pathological fracture in neoplastic disease, left humerus, sequela converts to ICD-9-CM 905.2 (late effect arm fx). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:
- The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
- The condition places limitations on self-care, independent living, and social interactions.
