2026 ICD-10-CM Diagnosis Code M84.550PPathological fracture in neoplastic disease, pelvis, subsequent encounter for fracture with malunion

ICD-10-CM Codes›M00–M99›M80-M85›M84

ICD-10-CM M84.550P
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M84.550P is a billable ICD-10-CM diagnosis code for pathological fracture in neoplastic disease, pelvis, subsequent encounter for fracture with malunion. The 7th character P reports a subsequent encounter for a fracture that has healed in a faulty position, called a malunion. 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. Coders also document this condition as pathologic fracture of pelvis at site of neoplasm. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Pathological fracture, subsequent encounter.

Code Identity

ICD-10-CM Code
M84.550P
Billable Status
Yes — Valid for Submission
Code Describes
Pathological fracture in neoplastic disease, pelvis, subsequent encounter for fracture with malunion
Short Description
Path fx in neopltc disease, pelvis, subs for fx w malunion
Parent Code
M84.550
Pathological fracture in neoplastic disease, pelvis

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM80-M85Disorders of bone density and structure
CategoryM84Disorder of continuity of bone
This CodeM84.550PPathological fracture in neoplastic disease, pelvis, subsequent encounter for fracture with malunion

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Pathologic fracture of pelvis at site of neoplasm
  • Pathological fracture of pelvis

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 M84.550P to ICD-9-CMHistory

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

ICD-9-CM
733.81 Malunion of fracture
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 M84.550POverview

Is M84.550P (Pathological fracture in neoplastic disease, pelvis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report pathological fracture in neoplastic disease, pelvis, subsequent encounter for fracture with malunion on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character P in M84.550P mean?

The final character P reports a subsequent encounter where the pathological fracture in neoplastic disease, pelvis has healed in a faulty position, called a malunion.

What MS-DRG does M84.550P group to?

When pathological fracture in neoplastic disease, pelvis, subsequent encounter for fracture with malunion 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 M84.550P?

Under the General Equivalence Mappings, pathological fracture in neoplastic disease, pelvis, subsequent encounter for fracture with malunion converts to ICD-9-CM 733.81 (malunion 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.