2026 ICD-10-CM Diagnosis Code M84.751KIncomplete atypical femoral fracture, right leg, subsequent encounter for fracture with nonunion
M84.751K is a billable ICD-10-CM diagnosis code for incomplete atypical femoral fracture, right leg, 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 521 through 522, 564 through 566. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Atypical fracture, subsequent encounter.
Code Identity
Code Classification
Present on Admission (POA)Billing
M84.751K is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Fractures
A fracture is a break in a bone. Fractures are usually caused by injuries. Since they can sometimes be serious, it's important to get medical care right away if you think you have a fracture.
The full article covers:
- What is a fracture?
- What are the different types of fractures?
- What causes fractures?
- What are the symptoms of a fracture?
- How are fractures diagnosed?
- What are the treatments for fractures?
- Can fractures be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert M84.751K to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code History & ChangesHistory
Replacement M84.751K replaces the following previously assigned code(s):
- S72.8X1K - Oth fracture of right femur, subs for clos fx w nonunion
- S72.8X2K - Oth fracture of left femur, subs for clos fx w nonunion
- S72.8X9K - Oth fracture of unsp femur, subs for clos fx w nonunion
Questions About M84.751KOverview
Is M84.751K (Incomplete atypical femoral fracture, right leg) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report incomplete atypical femoral fracture, right leg, 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 M84.751K mean?
The final character K reports a subsequent encounter where the incomplete atypical femoral fracture, right leg has failed to heal, called a nonunion.
What MS-DRG does M84.751K group to?
When incomplete atypical femoral fracture, right leg, subsequent encounter for fracture with nonunion is the principal diagnosis on an inpatient stay, it groups to MS-DRG 521, 522, 564, 565, 566, with relative weights from 0.7493 to 2.8702 depending on complications. Higher weights mean higher Medicare reimbursement.
Is M84.751K exempt from POA reporting?
Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for incomplete atypical femoral fracture, right leg, subsequent encounter for fracture with nonunion on inpatient claims.
What is the ICD-9 equivalent of M84.751K?
Under the General Equivalence Mappings, incomplete atypical femoral fracture, right leg, 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] 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.
