2026 ICD-10-CM Diagnosis Code M76.899Other specified enthesopathies of unspecified lower limb, excluding foot

ICD-10-CM Codes›M00–M99›M70-M79›M76

ICD-10-CM M76.899
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M76.899 is a billable ICD-10-CM diagnosis code for other specified enthesopathies of unspecified lower limb, excluding foot. 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 Tendon and synovial disorders.

Code Identity

ICD-10-CM Code
M76.899
Billable Status
Yes — Valid for Submission
Code Describes
Other specified enthesopathies of unspecified lower limb, excluding foot
Short Description
Oth enthesopathies of unspecified lower limb, excluding foot
Parent Code
M76.89
Other specified enthesopathies of lower limb, excluding foot

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM70-M79Other soft tissue disorders
CategoryM76Enthesopathies, lower limb, excluding foot
This CodeM76.899Other specified enthesopathies of unspecified lower limb, excluding foot

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Adductor tendinitis
  • Biceps femoris tendinitis
  • Bursitis of ankle region
  • Bursitis of bursa of ankle and/or foot
  • Enthesopathy of knee
  • Impingement syndrome of ankle
  • Pes anserinus bursitis
  • Pes anserinus tendinitis
  • Pes anserinus tendinitis and bursitis
  • Semimembranosus tendinitis
  • Tendinitis of hip

Clinical ClassificationClinical

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

CCSR MUS009
Tendon and synovial disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Connective Tissue Disorders

Your connective tissue supports many different parts of your body, such as your skin, eyes, and heart. It is like a "cellular glue" that gives your body parts their shape and helps keep them strong. It also helps some of your tissues do their work. It is made of many kinds of proteins. Cartilage and fat are types of connective tissue.

Read the full article at MedlinePlus

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

Convert M76.899 to ICD-9-CMHistory

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

ICD-9-CM
726.69 Enthesopathy of knee NEC
Approximate The match is approximate rather than exact.
ICD-9-CM
726.70 Ankle enthesopathy NOS
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 M76.899Overview

Is M76.899 (Other specified enthesopathies of lower limb, excluding foot) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other specified enthesopathies of unspecified lower limb, excluding foot on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M76.899 group to?

When other specified enthesopathies of unspecified lower limb, excluding foot 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 M76.899?

Under the General Equivalence Mappings, other specified enthesopathies of unspecified lower limb, excluding foot converts to ICD-9-CM 726.69 (enthesopathy of knee NEC) and 726.70 (ankle enthesopathy NOS). 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.