ICD-10-CM Code M77

Other enthesopathies

Version 2020 Non-Billable Code

Not Valid for Submission

M77 is a "header" nonspecific and non-billable code code, consider using a code with a higher level of specificity for a diagnosis of other enthesopathies. The code is NOT valid for the year 2020 for the submission of HIPAA-covered transactions.

ICD-10:M77
Short Description:Other enthesopathies
Long Description:Other enthesopathies

Consider the following ICD-10 codes with a higher level of specificity:

  • M77.0 - Medial epicondylitis
  • M77.00 - Medial epicondylitis, unspecified elbow
  • M77.01 - Medial epicondylitis, right elbow
  • M77.02 - Medial epicondylitis, left elbow
  • M77.1 - Lateral epicondylitis
  • M77.10 - Lateral epicondylitis, unspecified elbow
  • M77.11 - Lateral epicondylitis, right elbow
  • M77.12 - Lateral epicondylitis, left elbow
  • M77.2 - Periarthritis of wrist
  • M77.20 - Periarthritis, unspecified wrist
  • M77.21 - Periarthritis, right wrist
  • M77.22 - Periarthritis, left wrist
  • M77.3 - Calcaneal spur
  • M77.30 - Calcaneal spur, unspecified foot
  • M77.31 - Calcaneal spur, right foot
  • M77.32 - Calcaneal spur, left foot
  • M77.4 - Metatarsalgia
  • M77.40 - Metatarsalgia, unspecified foot
  • M77.41 - Metatarsalgia, right foot
  • M77.42 - Metatarsalgia, left foot
  • M77.5 - Other enthesopathy of foot and ankle
  • M77.50 - Other enthesopathy of unspecified foot and ankle
  • M77.51 - Other enthesopathy of right foot and ankle
  • M77.52 - Other enthesopathy of left foot and ankle
  • M77.8 - ... not elsewhere classified
  • M77.9 - Enthesopathy, unspecified

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code M77:

Type 1 Excludes

Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

Type 2 Excludes

Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
  • bursitis due to use, overuse and pressure M70
  • osteophyte M25.7
  • spinal enthesopathy M46.0

Clinical Information

  • ENTHESOPATHY-. a disorder occurring at the site of insertion of tendons or ligaments into bones or joint capsules.

Code Classification

  • Diseases of the musculoskeletal system and connective tissue (M00–M99)
    • Other soft tissue disorders (M70-M79)
      • Other enthesopathies (M77)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

Information for Patients


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.

Over 200 disorders that impact connective tissue. There are different types:

  • Genetic disorders, such as Ehlers-Danlos syndrome, Marfan syndrome, and osteogenesis imperfecta
  • Autoimmune disorders, such as lupus and scleroderma
  • Cancers, like some types of soft tissue sarcoma

Each disorder has its own symptoms and needs different treatment.

NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases


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