2026 ICD-10-CM Diagnosis Code M84.374AStress fracture, right foot, initial encounter for fracture

ICD-10-CM Codes›M00–M99›M80-M85›M84

ICD-10-CM M84.374A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M84.374A is a billable ICD-10-CM diagnosis code for stress fracture, right foot, initial encounter for fracture. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 542 through 544. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Stress fracture, initial encounter.

Code Identity

ICD-10-CM Code
M84.374A
Billable Status
Yes — Valid for Submission
Code Describes
Stress fracture, right foot, initial encounter for fracture
Short Description
Stress fracture, right foot, initial encounter for fracture
Same as the full description in the CMS dataset.
Parent Code
M84.374
Stress fracture, right foot

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM80-M85Disorders of bone density and structure
CategoryM84Disorder of continuity of bone
This CodeM84.374AStress fracture, right foot, initial encounter for fracture

Quality Payment Program MeasuresBilling

Medicare quality measures that can apply when M84.374A 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 six months after the fracture.

View Measure

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Fracture of navicular
  • Fracture of right calcaneum
  • Stress fracture of calcaneus
  • Stress fracture of metatarsal bone
  • Stress fracture of metatarsal bone of right foot
  • Stress fracture of navicular bone of foot
  • Stress fracture of navicular bone of right foot
  • Stress fracture of right calcaneus
  • Stress fracture of right foot
  • Stress fracture of right tarsus
  • Stress fracture of tarsal bone

Clinical ClassificationClinical

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

CCSR MUS016
Stress fracture, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Foot Injuries and Disorders

Each of your feet has 26 bones, 33 joints, and more than 100 tendons, muscles, and ligaments. No wonder a lot of things can go wrong. Here are a few common problems:

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert M84.374A to ICD-9-CMHistory

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

ICD-9-CM
733.94 Stress fx metatarsals
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 M84.374AOverview

Is M84.374A (Stress fracture, right foot) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report stress fracture, right foot, initial encounter for fracture on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in M84.374A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for stress fracture, right foot, such as an emergency visit or first evaluation.

What MS-DRG does M84.374A group to?

When stress fracture, right foot, initial encounter for fracture is the principal diagnosis on an inpatient stay, it groups to MS-DRG 542, 543, 544, with relative weights from 0.7546 to 1.7665 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M84.374A?

Under the General Equivalence Mappings, stress fracture, right foot, initial encounter for fracture converts to ICD-9-CM 733.94 (stress fx metatarsals). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.