2026 ICD-10-CM Diagnosis Code M84.571KPathological fracture in neoplastic disease, right ankle, subsequent encounter for fracture with nonunion
ICD-10-CM Codes›M00–M99›M80-M85›M84
- Billable — Valid for Submission
- 7th Character K — Subsequent, Nonunion
- Chronic Condition
M84.571K is a billable ICD-10-CM diagnosis code for pathological fracture in neoplastic disease, right ankle, subsequent encounter for fracture with nonunion. The 7th character K reports a subsequent encounter for a fracture that has failed to heal, called a nonunion. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 564 through 566. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Pathological fracture, subsequent encounter.
Code Identity
Code Classification
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Ankle Injuries and Disorders
Your ankle bone and the ends of your two lower leg bones make up the ankle joint. Your ligaments, which connect bones to one another, stabilize and support it. Your muscles and tendons move it.
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Convert M84.571K to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About M84.571KOverview
Is M84.571K (Pathological fracture in neoplastic disease, right ankle) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report pathological fracture in neoplastic disease, right ankle, subsequent encounter for fracture with nonunion on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character K in M84.571K mean?
The final character K reports a subsequent encounter where the pathological fracture in neoplastic disease, right ankle has failed to heal, called a nonunion.
What MS-DRG does M84.571K group to?
When pathological fracture in neoplastic disease, right ankle, subsequent encounter for fracture with nonunion is the principal diagnosis on an inpatient stay, it groups to MS-DRG 564, 565, 566, with relative weights from 0.7493 to 1.5436 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of M84.571K?
Under the General Equivalence Mappings, pathological fracture in neoplastic disease, right ankle, subsequent encounter for fracture with nonunion converts to ICD-9-CM 733.82 (nonunion of fracture). 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.
