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  3. M00–M99
  4. M70-M79
  5. Other enthesopathies (M77)

Other enthesopathies (M77)

The ICD-10 code section M77 covers various types of enthesopathies, which are disorders involving the attachment of tendons or ligaments to bone. These codes include specific conditions such as medial and lateral epicondylitis (commonly known as "tennis elbow" or "golfer's elbow"), periarthritis of the wrist, calcaneal spur (heel spur), metatarsalgia, and other enthesopathies affecting the foot, ankle, and upper limbs.

The detailed codes under M77 help specify the exact location and side for enthesopathy diagnoses. For example, M77.0 series relates to medial epicondylitis, often referred to simply as "epicondylitis," with subcodes identifying right (M77.01) or left elbow involvement (M77.02). Similarly, lateral epicondylitis is captured under M77.1, with distinctions for right and left elbows. Periarthritis codes (M77.2) focus on wrist inflammation, while calcaneal spur codes (M77.3) address heel bone spurs, a common cause of foot pain. Additionally, codes for metatarsalgia (M77.4) document pain in the ball of the foot. The broader category also includes less common enthesopathies of foot and ankle, or other regions like the shoulder and hand (M77.8 and M77.9), assisting medical coders in accurately classifying tendon-related disorders based on location and side. Using these codes ensures precise identification of conditions like "epicondylitis," "postcalcaneal bursitis," or "tendinitis," facilitating appropriate clinical documentation and treatment planning.

Instructional Notations

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

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 Terms

The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.

Enthesopathy

A disorder occurring at the site of insertion of TENDONS or LIGAMENTS into bones or JOINT CAPSULES.

Metatarsal Bones

The five long bones of the METATARSUS, articulating with the TARSAL BONES proximally and the PHALANGES OF TOES distally.

Metatarsalgia

Pain in the region of the METATARSUS. It can include pain in the METATARSAL BONES; METATARSOPHALANGEAL JOINT; and/or intermetatarsal joints (TARSAL JOINTS).

Morton Neuroma

A nerve inflammation in the foot caused by chronic compression of the plantar nerve between the METATARSAL BONES.

Periarthritis

Inflammation of the tissues around a joint. (Dorland, 27th ed)