2027 ICD-10-CM Diagnosis Code M80.0AXKAge-related 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 M80.0AXK
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

M80.0AXK is a billable ICD-10-CM diagnosis code for age-related osteoporosis with current pathological fracture, other site, subsequent encounter for fracture with nonunion. The 7th character K means subsequent encounter for fracture with nonunion. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 521 through 522, 564 through 566. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 396 closely related codes. The code is restricted by the Medicare Code Editor to adult patients (age 15 through 124) and 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
M80.0AXK
Billable Status
Yes — Valid for Submission
Code Describes
Age-related osteoporosis with current pathological fracture, other site, subsequent encounter for fracture with nonunion
Short Description
Age-rel osteopor with current path fx, other site, 7thK
Parent Code
M80.0A
Age-related 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 CodeM80.0AXKAge-related osteoporosis with current pathological fracture, other site, subsequent encounter for fracture with nonunion

Code EditsBilling

Medicare Code Editor checks that affect claim validity for M80.0AXK.

Adult diagnoses
The Medicare Code Editor detects inconsistencies in adult cases by checking a patient's age and any diagnosis on the patient's record. The adult code edits apply to patients age range is 15–124 years inclusive (e.g., senile delirium, mature cataract).

Present on Admission (POA)Billing

M80.0AXK is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Disorders of bone density and structure (M80-M85).

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to M80.0AXK: its own notes plus those printed at M80 and Chapter 13. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From M80 Osteoporosis with current pathological fracture applies to 324 codes
  • osteoporosis with current fragility fracture

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From M80 Osteoporosis with current pathological fracture applies to 324 codes
  • collapsed vertebra NOS (M48.5)
  • pathological fracture NOS (M84.4)
  • wedging of vertebra NOS (M48.5)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From M80 Osteoporosis with current pathological fracture applies to 324 codes
  • personal history of (healed) osteoporosis fracture (Z87.310)
From Chapter 13 (M00-M99) Diseases of the musculoskeletal system and connective tissue applies to 6,687 codes
  • arthropathic psoriasis (L40.5-)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • compartment syndrome (traumatic) (T79.A-)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From M80 Osteoporosis with current pathological fracture applies to 324 codes
  • code to identify major osseous defect, if applicable (M89.7-)

Notes

General instructions on how these codes are used.

From Chapter 13 (M00-M99) Diseases of the musculoskeletal system and connective tissue applies to 6,687 codes
  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

7th Character

Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.

From M80 Osteoporosis with current pathological fracture applies to 324 codes
  • The appropriate 7th character is to be added to each code from category M80:
Values for category M80 Pathological Fracture Encounter
  • Ainitial encounter for fracture
  • Dsubsequent encounter for fracture with routine healing
  • Gsubsequent encounter for fracture with delayed healing
  • Ksubsequent encounter for fracture with nonunion this code
  • Psubsequent encounter for fracture with malunion
  • Ssequela

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name M80.0AXK, its category, or a range that includes it.

Excludes1 9

These codes carry an Excludes1 note naming M80.0AXK: they are not reported together with it, unless the two conditions are unrelated.

  • E55 Vitamin D deficiency
    osteoporosis (M80.-) names M80.-, which includes this code
  • E83.3 Disorders of phosphorus metabolism and phosphatases
    osteoporosis (M80.-) names M80.-, which includes this code
  • M43 Other deforming dorsopathies
    spinal curvature in osteoporosis (M80.-) names M80.-, which includes this code
  • M48.4 Fatigue fracture of vertebra
    pathological fracture of vertebra due to osteoporosis (M80.-) names M80.-, which includes this code
  • M48.5 Collapsed vertebra, not elsewhere classified
    pathological fracture of vertebra due to osteoporosis (M80.-) names M80.-, which includes this code
  • M81 Osteoporosis without current pathological fracture
    osteoporosis with current pathological fracture (M80.-) names M80.-, which includes this code
  • M84.3 Stress fracture
    pathological fracture due to osteoporosis (M80.-) names M80.-, which includes this code
  • M84.4 Pathological fracture, not elsewhere classified
    pathological fracture in osteoporosis (M80.-) names M80.-, which includes this code
  • M84.6 Pathological fracture in other disease
    pathological fracture in osteoporosis (M80.-) names M80.-, which includes this code

Excludes2 2

These codes carry an Excludes2 note naming M80.0AXK: its condition is not part of those codes, and both may be reported when the patient has both.

  • M96 Intraoperative and postprocedural complications and disorders of musculoskeletal system, not elsewhere classified
    disorders associated with osteoporosis (M80) names M80, which includes this code
  • N95 Menopausal and other perimenopausal disorders
    postmenopausal osteoporosis with current pathological fracture (M80.0-) names M80.0-, which includes this code

Code First 1

These codes say to code first a condition named in the note, and M80.0AXK is one of the conditions named.

  • M89.7 Major osseous defect
    osteoporosis (M80.-, M81.-) names M80.-, which includes this code

Code Also 1

These codes say M80.0AXK may also be needed to fully describe the condition. The note gives no sequencing direction.

  • Z91.B Personal risk factor of exposure to diethylstilbestrol
    osteoporosis (M80.-) names M80.-, which includes this code

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.

Code History & ChangesHistory

Replacement M80.0AXK replaces the following previously assigned code(s):

  • M80.00XK - Age-rel osteopor w crnt path fx, unsp site, 7thK
FY 2021AddedAdded to the ICD-10-CM code setEffective October 1, 2020.
FY 2022–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About M80.0AXKOverview

Is M80.0AXK a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report age-related osteoporosis with current pathological fracture, other site, subsequent encounter for fracture with nonunion on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What does the 7th character K in M80.0AXK mean?

The final character K reports a subsequent encounter where the age-related osteoporosis with current pathological fracture, other site has failed to heal, called a nonunion. In this category the CMS Tabular List defines K as "subsequent encounter for fracture with nonunion".

What MS-DRG does M80.0AXK group to?

When age-related 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 564, 521, 522, 566, 565, with relative weights from 0.7374 to 2.8516 depending on complications. Higher weights mean higher Medicare reimbursement.

Is M80.0AXK a CC or MCC?

CMS lists M80.0AXK as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 396 closely related codes in its exclusion list.

Who can M80.0AXK be reported for?

The Medicare Code Editor checks age-related osteoporosis with current pathological fracture, other site, subsequent encounter for fracture with nonunion against patient demographics: this code is intended for adult patients (age 15 through 124). Claims outside these limits are flagged as inconsistent.