2027 ICD-10-CM Diagnosis Code M84.753AIncomplete atypical femoral fracture, unspecified leg, initial encounter for fracture

ICD-10-CM Codes›M00–M99›M80-M85›M84

ICD-10-CM M84.753A
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

M84.753A is a billable ICD-10-CM diagnosis code for incomplete atypical femoral fracture, unspecified leg, initial encounter for fracture. The 7th character A means initial encounter for fracture, used while the patient is receiving active treatment. 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, 542 through 544, 791, 793. 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 214 closely related codes. The code is flagged as an unspecified code, since codes identifying laterality exist in the same family. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Atypical fracture, initial encounter.

Code Identity

ICD-10-CM Code
M84.753A
Billable Status
Yes — Valid for Submission
Code Describes
Incomplete atypical femoral fracture, unspecified leg, initial encounter for fracture
Short Description
Incomplete atypical femoral fracture, unspecified leg, init
Parent Code
M84.753
Incomplete atypical femoral fracture, unspecified leg

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM80-M85Disorders of bone density and structure
CategoryM84Disorder of continuity of bone
This CodeM84.753AIncomplete atypical femoral fracture, unspecified leg, initial encounter for fracture

Code EditsBilling

Medicare Code Editor checks that affect claim validity for M84.753A.

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.

Quality Payment Program MeasuresBilling

Medicare quality measures that can apply when M84.753A is part of the patient record.

Communication with the Physician or Other Clinician Managing On-Going Care Post-Fracture for Men and Women Aged 50 Years and Older

High Priority: YES

Measure Type: Process

Submission Methods: Claims, Registry

Description: Percentage of patients aged 50 years and older treated for a fracture with documentation of communication, between the physician treating the fracture and the physician or other clinician managing the patient’s on-going care, that a fracture occurred and that the patient was or should be considered for osteoporosis treatment or testing. This measure is submitted by the physician who treats the fracture and who therefore is held accountable for the communication.

View Measure

Osteoporosis Management in Women Who Had a Fracture

High Priority: NO

Measure Type: Process

Submission Methods: Claims, Registry

Description: The percentage of women 50-85 years of age who suffered a fracture and who had either a bone mineral density (BMD) test or prescription for a drug to treat osteoporosis in the 180 days after the fracture.

View Measure

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to M84.753A: its own notes plus those printed at M84.75, M84, and Chapter 13. A note printed at a category, block or chapter applies to every code under it.

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 M84 Disorder of continuity of bone applies to 928 codes
  • traumatic fracture of bone-see fracture, by site
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)

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 M84.75 Atypical femoral fracture applies to 60 codes
  • The appropriate 7th character is to be added to each code from M84.75:
Values for category M84.75 Pathological Fracture Encounter
  • Ainitial encounter for fracture this code
  • Dsubsequent encounter for fracture with routine healing
  • Gsubsequent encounter for fracture with delayed healing
  • Ksubsequent encounter for fracture with nonunion
  • Psubsequent encounter for fracture with malunion
  • Ssequela

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

Clinical ClassificationClinical

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

CCSR MUS018
Atypical fracture, initial 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.

Convert M84.753A to ICD-9-CMHistory

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

ICD-9-CM
733.15 Path fx oth spcf prt fmr
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replacement M84.753A replaces the following previously assigned code(s):

  • S72.8X1A - Oth fracture of right femur, init encntr for closed fracture
  • S72.8X2A - Oth fracture of left femur, init encntr for closed fracture
  • S72.8X9A - Oth fracture of unsp femur, init encntr for closed fracture
FY 2019AddedAdded to the ICD-10-CM code setEffective October 1, 2018.
FY 2020–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About M84.753AOverview

Is M84.753A (Incomplete atypical femoral fracture, unspecified leg) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report incomplete atypical femoral fracture, unspecified leg, initial encounter for fracture on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What does the 7th character A in M84.753A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for incomplete atypical femoral fracture, unspecified leg, such as an emergency visit or first evaluation. In this category the CMS Tabular List defines A as "initial encounter for fracture".

What MS-DRG does M84.753A group to?

When incomplete atypical femoral fracture, unspecified leg, initial encounter for fracture is the principal diagnosis on an inpatient stay, it groups to MS-DRG 543, 793, 791, 521, 544, 522, 542, with relative weights from 0.7404 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.

Is M84.753A a CC or MCC?

CMS lists M84.753A 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 214 closely related codes in its exclusion list.

What is the ICD-9 equivalent of M84.753A?

Under the General Equivalence Mappings, incomplete atypical femoral fracture, unspecified leg, initial encounter for fracture converts to ICD-9-CM 733.15 (path fx oth spcf prt fmr). The mapping is approximate, so confirm the match fits the documentation.