2027 ICD-10-CM Diagnosis Code M77Other enthesopathies

ICD-10-CM Codes›M00–M99›M70-M79›M77

ICD-10-CM M77
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to M77: its own notes plus those printed at Chapter 13. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

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.

On M77 itself
  • bursitis due to use, overuse and pressure (M70.-)
  • osteophyte (M25.7)
  • spinal enthesopathy (M46.0-)
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

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

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name M77, its category, or a range that includes it.

Excludes1 2

These codes carry an Excludes1 note naming M77: they are not reported together with it, unless the two conditions are unrelated.

  • M65.2 Calcific tendinitis
    tendinitis as classified in M75-M77 names M75-M77, which includes this code
  • M71 Other bursopathies
    enthesopathies (M76-M77) names M76-M77, which includes this code

Excludes2 1

These codes carry an Excludes2 note naming M77: its condition is not part of those codes, and both may be reported when the patient has both.

  • M70 Soft tissue disorders related to use, overuse and pressure
    enthesopathies (M76-M77) names M76-M77, which includes this code

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About M77Overview

What is the ICD-10 code for other enthesopathies?

M77 is the ICD-10-CM category for other enthesopathies, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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.

Can M77 be reported with a code from M71.9?

Not as a rule. The Excludes1 note on M77 lists "bursitis NOS (M71.9-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).