2027 ICD-10-CM Diagnosis Code M80.852KOther osteoporosis with current pathological fracture, left femur, subsequent encounter for fracture with nonunion
ICD-10-CM Codes›M00–M99›M80-M85›M80
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- POA Exempt
- 7th Character K — Subsequent, Nonunion
- Chronic Condition
M80.852K is a billable ICD-10-CM diagnosis code for other osteoporosis with current pathological fracture, left femur, 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 5,561 closely related codes. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Pathological fracture, subsequent encounter.
Code Identity
Code Classification
Present on Admission (POA)Billing
M80.852K 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).
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Osteoporotic fracture of bone of hip region
- Osteoporotic fracture of femur
- Osteoporotic fracture of proximal femur
- Pathological fracture of left femur
- Pathological fracture of left femur due to osteoporosis
- Pathological fracture of left femur due to secondary osteoporosis
- Secondary osteoporotic fracture of femur
- Secondary osteoporotic fracture of hip joint region
- Secondary osteoporotic fracture of proximal end of left femur
- Secondary osteoporotic fracture of proximal femur
- Stress fracture of left femur
- Stress fracture of left hip
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to M80.852K: its own notes plus those printed at M80.8, 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.
- 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.
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.
- personal history of (healed) osteoporosis fracture (Z87.310)
- 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)
Notes
General instructions on how these codes are used.
- 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.
- The appropriate 7th character is to be added to each code from category M80:
- 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 M80.852K, its category, or a range that includes it.
Excludes1 10
These codes carry an Excludes1 note naming M80.852K: they are not reported together with it, unless the two conditions are unrelated.
- E55 Vitamin D deficiencyosteoporosis (M80.-) names M80.-, which includes this code
- E83.3 Disorders of phosphorus metabolism and phosphatasesosteoporosis (M80.-) names M80.-, which includes this code
- K91.2 Postsurgical malabsorption, not elsewhere classifiedmalabsorption osteoporosis, postsurgical (M80.8-, M81.8) names M80.8-, which includes this code
- M43 Other deforming dorsopathiesspinal curvature in osteoporosis (M80.-) names M80.-, which includes this code
- M48.4 Fatigue fracture of vertebrapathological fracture of vertebra due to osteoporosis (M80.-) names M80.-, which includes this code
- M48.5 Collapsed vertebra, not elsewhere classifiedpathological fracture of vertebra due to osteoporosis (M80.-) names M80.-, which includes this code
- M81 Osteoporosis without current pathological fractureosteoporosis with current pathological fracture (M80.-) names M80.-, which includes this code
- M84.3 Stress fracturepathological fracture due to osteoporosis (M80.-) names M80.-, which includes this code
- M84.4 Pathological fracture, not elsewhere classifiedpathological fracture in osteoporosis (M80.-) names M80.-, which includes this code
- M84.6 Pathological fracture in other diseasepathological fracture in osteoporosis (M80.-) names M80.-, which includes this code
Excludes2 2
These codes carry an Excludes2 note naming M80.852K: 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 classifieddisorders associated with osteoporosis (M80) names M80, which includes this code
- N99 Intraoperative and postprocedural complications and disorders of genitourinary system, not elsewhere classifiedpostoophorectomy osteoporosis with current pathological fracture (M80.8-) names M80.8-, which includes this code
Code First 1
These codes say to code first a condition named in the note, and M80.852K is one of the conditions named.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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.
Convert M80.852K to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About M80.852KOverview
Is M80.852K a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other osteoporosis with current pathological fracture, left femur, 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 M80.852K mean?
The final character K reports a subsequent encounter where the other osteoporosis with current pathological fracture, left femur 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 M80.852K group to?
When other osteoporosis with current pathological fracture, left femur, 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 M80.852K a CC or MCC?
CMS lists M80.852K 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 5,561 closely related codes in its exclusion list.
Is M80.852K 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, left femur, subsequent encounter for fracture with nonunion on inpatient claims. The code appears in the Disorders of bone density and structure (M80-M85) range of the CMS exempt list.
