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  6. 2024 ICD-10-CM Code M77
Version 2024
Non-Billable Code

2024 ICD-10-CM Diagnosis Code M77

Other enthesopathies

ICD-10-CM Code:
M77
ICD-10 Code for:
Other enthesopathies
Is Billable?
Not Valid for Submission
Code Navigator:

Code Classification

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

M77 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of other enthesopathies. The code is not specific and is NOT valid for the year 2024 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Specific Coding Applicable to Other enthesopathies

Non-specific codes like M77 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10-CM codes with a higher level of specificity when coding for other enthesopathies:

  • M77.0 for Medial epicondylitis - NON-BILLABLE CODE

  • Use M77.00 for Medial epicondylitis, unspecified elbow - BILLABLE CODE

  • Use M77.01 for Medial epicondylitis, right elbow - BILLABLE CODE

  • Use M77.02 for Medial epicondylitis, left elbow - BILLABLE CODE

  • M77.1 for Lateral epicondylitis - NON-BILLABLE CODE

  • Use M77.10 for Lateral epicondylitis, unspecified elbow - BILLABLE CODE

  • Use M77.11 for Lateral epicondylitis, right elbow - BILLABLE CODE

  • Use M77.12 for Lateral epicondylitis, left elbow - BILLABLE CODE

  • M77.2 for Periarthritis of wrist - NON-BILLABLE CODE

  • Use M77.20 for Periarthritis, unspecified wrist - BILLABLE CODE

  • Use M77.21 for Periarthritis, right wrist - BILLABLE CODE

  • Use M77.22 for Periarthritis, left wrist - BILLABLE CODE

  • M77.3 for Calcaneal spur - NON-BILLABLE CODE

  • Use M77.30 for Calcaneal spur, unspecified foot - BILLABLE CODE

  • Use M77.31 for Calcaneal spur, right foot - BILLABLE CODE

  • Use M77.32 for Calcaneal spur, left foot - BILLABLE CODE

  • M77.4 for Metatarsalgia - NON-BILLABLE CODE

  • Use M77.40 for Metatarsalgia, unspecified foot - BILLABLE CODE

  • Use M77.41 for Metatarsalgia, right foot - BILLABLE CODE

  • Use M77.42 for Metatarsalgia, left foot - BILLABLE CODE

  • M77.5 for Other enthesopathy of foot and ankle - NON-BILLABLE CODE

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

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

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

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

  • Use M77.9 for Enthesopathy, unspecified - BILLABLE CODE

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.


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

Patient Education


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


[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.