2026 ICD-10-CM Diagnosis Code M76.31Iliotibial band syndrome, right leg

ICD-10-CM Codes›M00–M99›M70-M79›M76

ICD-10-CM M76.31
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M76.31 is a billable ICD-10-CM diagnosis code for iliotibial band syndrome, right leg. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 557 through 558. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified connective tissue disease.

Code Identity

ICD-10-CM Code
M76.31
Billable Status
Yes — Valid for Submission
Code Describes
Iliotibial band syndrome, right leg
Short Description
Iliotibial band syndrome, right leg
Same as the full description in the CMS dataset.
Parent Code
M76.3
Iliotibial band syndrome

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM70-M79Other soft tissue disorders
CategoryM76Enthesopathies, lower limb, excluding foot
This CodeM76.31Iliotibial band syndrome, right leg

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bilateral iliotibial band friction syndrome of knees
  • Iliotibial band friction syndrome
  • Iliotibial band friction syndrome of left knee
  • Iliotibial band friction syndrome of right knee
  • Inflammatory pain
  • Pain of bilateral knee regions
  • Pain of bilateral thighs
  • Pain of left knee region
  • Pain of right knee region

Clinical ClassificationClinical

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

CCSR MUS025
Other specified connective tissue disease
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Iliotibial Band Syndrome

    an overuse injury causing lateral knee pain that results from repetitive friction of the iliotibial band over the lateral femoral epicondyle.

Patient EducationClinical

Knee Injuries and Disorders

Your knee joint is made up of bone, cartilage, ligaments and fluid. Muscles and tendons help the knee joint move. When any of these structures is hurt or diseased, you have knee problems. Knee problems can cause pain and difficulty walking.

Read the full article at MedlinePlus

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

Convert M76.31 to ICD-9-CMHistory

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

ICD-9-CM
726.5 Enthesopathy of hip
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 M76.31Overview

Is M76.31 (Iliotibial band syndrome) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report iliotibial band syndrome, right leg on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M76.31 group to?

When iliotibial band syndrome, right leg is the principal diagnosis on an inpatient stay, it groups to MS-DRG 557, 558, with relative weights from 0.8932 to 1.4869 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M76.31?

Under the General Equivalence Mappings, iliotibial band syndrome, right leg converts to ICD-9-CM 726.5 (enthesopathy of hip). 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.