2026 ICD-10-CM Diagnosis Code M84.451DPathological fracture, right femur, subsequent encounter for fracture with routine healing

ICD-10-CM Codes›M00–M99›M80-M85›M84

ICD-10-CM M84.451D
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M84.451D is a billable ICD-10-CM diagnosis code for pathological fracture, right femur, 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 fracture of midcervical section of neck of right femur. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Pathological fracture, subsequent encounter.

Code Identity

ICD-10-CM Code
M84.451D
Billable Status
Yes — Valid for Submission
Code Describes
Pathological fracture, right femur, subsequent encounter for fracture with routine healing
Short Description
Pathological fracture, right femur, subs for fx w routn heal
Parent Code
M84.451
Pathological fracture, right femur

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM80-M85Disorders of bone density and structure
CategoryM84Disorder of continuity of bone
This CodeM84.451DPathological fracture, right femur, subsequent encounter for fracture with routine healing

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Fracture of midcervical section of neck of right femur
  • Fracture of neck of right femur
  • Midcervical fracture of neck of femur
  • Pathological fracture of neck of femur
  • Pathological fracture of neck of right femur
  • Pathological fracture of proximal end of femur
  • Pathological fracture of right femur
  • Pathological fracture of right hip

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MUS015
Pathological fracture, subsequent encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

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 M84.451D to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
V54.25 Aftrcare path fx up leg
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About M84.451DOverview

Is M84.451D (Pathological fracture, right femur) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report pathological fracture, right femur, 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 M84.451D mean?

The final character D marks a subsequent encounter: use it for routine care while the pathological fracture, right femur is healing, after active treatment has ended.

What MS-DRG does M84.451D group to?

When pathological fracture, right femur, 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 M84.451D?

Under the General Equivalence Mappings, pathological fracture, right femur, subsequent encounter for fracture with routine healing converts to ICD-9-CM V54.25 (aftrcare path fx up leg). 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.