2026 ICD-10-CM Diagnosis Code M84.339GStress fracture, unspecified ulna and radius, subsequent encounter for fracture with delayed healing

ICD-10-CM Codes›M00–M99›M80-M85›M84

ICD-10-CM M84.339G
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M84.339G is a billable ICD-10-CM diagnosis code for stress fracture, unspecified ulna and radius, subsequent encounter for fracture with delayed healing. The 7th character G reports a subsequent encounter for a fracture that is healing more slowly than expected. 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 stress fracture of radius. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Stress fracture, subsequent encounter.

Code Identity

ICD-10-CM Code
M84.339G
Billable Status
Yes — Valid for Submission
Code Describes
Stress fracture, unspecified ulna and radius, subsequent encounter for fracture with delayed healing
Short Description
Stress fx, unsp ulna and radius, subs for fx w delay heal
Parent Code
M84.339
Stress fracture, unspecified ulna and radius

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM80-M85Disorders of bone density and structure
CategoryM84Disorder of continuity of bone
This CodeM84.339GStress fracture, unspecified ulna and radius, subsequent encounter for fracture with delayed healing

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Stress fracture of radius
  • Stress fracture of ulna

Clinical ClassificationClinical

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

CCSR MUS017
Stress fracture, subsequent encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Arm Injuries and Disorders

Of the 206 bones in your body, three of them are in your arm: the humerus, radius, and ulna. Your arms are also made up of muscles, joints, tendons, and other connective tissue. Injuries to any of these parts of the arm can occur during sports, a fall, or an accident.

Read the full article at MedlinePlus

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

Convert M84.339G to ICD-9-CMHistory

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

ICD-9-CM
V54.22 Aftrcare path fx low arm
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 M84.339GOverview

Is M84.339G (Stress fracture, unspecified ulna and radius) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report stress fracture, unspecified ulna and radius, subsequent encounter for fracture with delayed healing on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character G in M84.339G mean?

The final character G reports a subsequent encounter where the stress fracture, unspecified ulna and radius is healing more slowly than expected.

What MS-DRG does M84.339G group to?

When stress fracture, unspecified ulna and radius, subsequent encounter for fracture with delayed 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 M84.339G?

Under the General Equivalence Mappings, stress fracture, unspecified ulna and radius, subsequent encounter for fracture with delayed healing converts to ICD-9-CM V54.22 (aftrcare path fx low arm). 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.