2026 ICD-10-CM Diagnosis Code M84.445PPathological fracture, left finger(s), subsequent encounter for fracture with malunion

ICD-10-CM Codes›M00–M99›M80-M85›M84

ICD-10-CM M84.445P
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M84.445P is a billable ICD-10-CM diagnosis code for pathological fracture, left finger(s), 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 pathological fracture - hand. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Pathological fracture, subsequent encounter.

Code Identity

ICD-10-CM Code
M84.445P
Billable Status
Yes — Valid for Submission
Code Describes
Pathological fracture, left finger(s), subsequent encounter for fracture with malunion
Short Description
Path fracture, left finger(s), subs for fx w malunion
Parent Code
M84.445
Pathological fracture, left finger(s)

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM80-M85Disorders of bone density and structure
CategoryM84Disorder of continuity of bone
This CodeM84.445PPathological fracture, left finger(s), subsequent encounter for fracture with malunion

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Pathological fracture - hand
  • Pathological fracture of left hand
  • Pathological fracture of phalanx of finger
  • Pathological fracture of phalanx of finger of left hand

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

Finger Injuries and Disorders

You use your fingers and thumbs to do everything from grasping objects to playing musical instruments to typing. When there is something wrong with them, it can make life difficult. Common problems include:

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert M84.445P 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 M84.445POverview

Is M84.445P (Pathological fracture, left finger(s)) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report pathological fracture, left finger(s), 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 M84.445P mean?

The final character P reports a subsequent encounter where the pathological fracture, left finger(s) has healed in a faulty position, called a malunion.

What MS-DRG does M84.445P group to?

When pathological fracture, left finger(s), 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 M84.445P?

Under the General Equivalence Mappings, pathological fracture, left finger(s), 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] 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.