2026 ICD-10-CM Diagnosis Code M80.839POther osteoporosis with current pathological fracture, unspecified forearm, subsequent encounter for fracture with malunion

ICD-10-CM Codes›M00–M99›M80-M85›M80

ICD-10-CM M80.839P
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M80.839P is a billable ICD-10-CM diagnosis code for other osteoporosis with current pathological fracture, unspecified forearm, 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. The code is flagged as an unspecified code, since codes identifying laterality exist in the same family and exempt from POA reporting. Coders also document this condition as osteoporotic fracture of radius. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Pathological fracture, subsequent encounter.

Code Identity

ICD-10-CM Code
M80.839P
Billable Status
Yes — Valid for Submission
Code Describes
Other osteoporosis with current pathological fracture, unspecified forearm, subsequent encounter for fracture with malunion
Short Description
Oth osteopor w crnt path fx, unsp forearm, 7thP
Parent Code
M80.839
Other osteoporosis with current pathological fracture, unspecified forearm

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM80-M85Disorders of bone density and structure
CategoryM80Osteoporosis with current pathological fracture
This CodeM80.839POther osteoporosis with current pathological fracture, unspecified forearm, subsequent encounter for fracture with malunion

Code EditsBilling

Medicare Code Editor checks that affect claim validity for M80.839P.

Unspecified codes
Unspecified codes exist in the ICD-10-CM classification for circumstances when documentation in the medical record does not provide the level of detail needed to support reporting a more specific code. However, in the inpatient setting, there should generally be very limited and rare circumstances for which the laterality (right, left, bilateral) of a condition is unable to be documented and reported. The following pages contain the list of unspecified ICD-10-CM diagnosis codes for which there is a more specific code to identify laterality (right, left, bilateral) within that code family.

Present on Admission (POA)Billing

M80.839P is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Osteoporotic fracture of radius
  • Osteoporotic fracture of ulna
  • Secondary osteoporotic fracture of radius
  • Secondary osteoporotic fracture of ulna
  • Stress fracture of radius
  • Stress fracture of ulna

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

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 M80.839P 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 M80.839POverview

Is M80.839P a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other osteoporosis with current pathological fracture, unspecified forearm, 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 M80.839P mean?

The final character P reports a subsequent encounter where the other osteoporosis with current pathological fracture, unspecified forearm has healed in a faulty position, called a malunion.

What MS-DRG does M80.839P group to?

When other osteoporosis with current pathological fracture, unspecified forearm, 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.

Is M80.839P 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 other osteoporosis with current pathological fracture, unspecified forearm, subsequent encounter for fracture with malunion on inpatient claims.

What is the ICD-9 equivalent of M80.839P?

Under the General Equivalence Mappings, other osteoporosis with current pathological fracture, unspecified forearm, 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.