2026 ICD-10-CM Diagnosis Code M80.8AXKOther osteoporosis with current pathological fracture, other site, subsequent encounter for fracture with nonunion

ICD-10-CM Codes›M00–M99›M80-M85›M80

ICD-10-CM M80.8AXK
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M80.8AXK is a billable ICD-10-CM diagnosis code for other osteoporosis with current pathological fracture, other site, subsequent encounter for fracture with nonunion. The 7th character K reports a subsequent encounter for a fracture that has failed to heal, called a nonunion. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 521 through 522, 564 through 566. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Pathological fracture, subsequent encounter.

Code Identity

ICD-10-CM Code
M80.8AXK
Billable Status
Yes — Valid for Submission
Code Describes
Other osteoporosis with current pathological fracture, other site, subsequent encounter for fracture with nonunion
Short Description
Other osteopor with current path fracture, other site, 7thK
Parent Code
M80.8A
Other osteoporosis with current pathological fracture, other site

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM80-M85Disorders of bone density and structure
CategoryM80Osteoporosis with current pathological fracture
This CodeM80.8AXKOther osteoporosis with current pathological fracture, other site, subsequent encounter for fracture with nonunion

Present on Admission (POA)Billing

M80.8AXK is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

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

Code History & ChangesHistory

Replacement M80.8AXK replaces the following previously assigned code(s):

  • M80.80XK - Oth osteopor w crnt path fx, unsp site, 7thK
FY 2021AddedAdded to the ICD-10-CM code setEffective October 1, 2020.
FY 2022–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About M80.8AXKOverview

Is M80.8AXK a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other osteoporosis with current pathological fracture, other site, subsequent encounter for fracture with nonunion on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character K in M80.8AXK mean?

The final character K reports a subsequent encounter where the other osteoporosis with current pathological fracture, other site has failed to heal, called a nonunion.

What MS-DRG does M80.8AXK group to?

When other osteoporosis with current pathological fracture, other site, subsequent encounter for fracture with nonunion is the principal diagnosis on an inpatient stay, it groups to MS-DRG 521, 522, 564, 565, 566, with relative weights from 0.7493 to 2.8702 depending on complications. Higher weights mean higher Medicare reimbursement.

Is M80.8AXK 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, other site, subsequent encounter for fracture with nonunion on inpatient claims.

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.