2026 ICD-10-CM Diagnosis Code M77Other enthesopathies

ICD-10-CM Codes›M00–M99›M70-M79›M77

ICD-10-CM M77
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M77 is a non-billable ICD-10-CM category code for other enthesopathies, so it cannot be submitted on claims. Use a more specific code from this category instead, such as M77.00, M77.01, M77.02, and M77.10.

Code Identity

ICD-10-CM Code
M77
Billable Status
No — Non-Billable Category
Code Describes
Other enthesopathies
Short Description
Other enthesopathies
Same as the full description in the CMS dataset.
Chapter
M70-M79
Other soft tissue disorders

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM70-M79Other soft tissue disorders
CategoryM77Other enthesopathies
This CodeM77Other enthesopathies

Specific Coding for Other enthesopathiesOverview

Non-specific codes like M77 require more characters. Use one of these billable codes instead:

  • M77.0 for Medial epicondylitis

  • Use M77.00 for Medial epicondylitis, unspecified elbow

  • Use M77.01 for Medial epicondylitis, right elbow

  • Use M77.02 for Medial epicondylitis, left elbow

  • M77.1 for Lateral epicondylitis

  • Use M77.10 for Lateral epicondylitis, unspecified elbow

  • Use M77.11 for Lateral epicondylitis, right elbow

  • Use M77.12 for Lateral epicondylitis, left elbow

  • M77.2 for Periarthritis of wrist

  • Use M77.20 for Periarthritis, unspecified wrist

  • Use M77.21 for Periarthritis, right wrist

  • Use M77.22 for Periarthritis, left wrist

  • M77.3 for Calcaneal spur

  • Use M77.30 for Calcaneal spur, unspecified foot

  • Use M77.31 for Calcaneal spur, right foot

  • Use M77.32 for Calcaneal spur, left foot

  • M77.4 for Metatarsalgia

  • Use M77.40 for Metatarsalgia, unspecified foot

  • Use M77.41 for Metatarsalgia, right foot

  • Use M77.42 for Metatarsalgia, left foot

  • M77.5 for Other enthesopathy of foot and ankle

  • Use M77.50 for Other enthesopathy of unspecified foot and ankle

  • Use M77.51 for Other enthesopathy of right foot and ankle

  • Use M77.52 for Other enthesopathy of left foot and ankle

  • Use M77.8 for Other enthesopathies, not elsewhere classified

  • Use M77.9 for Enthesopathy, unspecified

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Type 1 Excludes

Type 2 Excludes

  • bursitis due to use, overuse and pressure M70
  • osteophyte M25.7
  • spinal enthesopathy M46.0

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.

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 M77Overview

Is M77 (Other enthesopathies) a billable code?

No. This is a category header that groups the codes for other enthesopathies, and headers cannot be submitted on claims. Claims for other enthesopathies need a more specific code from this category, such as M77.00, M77.01, and M77.02.