2023 ICD-10-CM Diagnosis Code M77.9

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Enthesopathy, unspecified

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
  • M77.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2023 edition of ICD-10-CM M77.9 became effective on October 1, 2022.
  • This is the American ICD-10-CM version of M77.9 - other international versions of ICD-10 M77.9 may differ.
Applicable To
  • Bone spur NOS
  • Capsulitis NOS
  • Periarthritis NOS
  • Tendinitis NOS
The following code(s) above M77.9 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to M77.9:
  • M00-M99
    2023 ICD-10-CM Range M00-M99

    Diseases of the musculoskeletal system and connective tissue

    • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition
    Type 2 Excludes
    • 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)
    Diseases of the musculoskeletal system and connective tissue
  • M77
    ICD-10-CM Diagnosis Code M77

    Other enthesopathies

      2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
    Type 1 Excludes
    Type 2 Excludes
    • bursitis due to use, overuse and pressure (M70.-)
    • osteophyte (M25.7)
    • spinal enthesopathy (M46.0-)
    Other enthesopathies
Approximate Synonyms
  • Bilateral tendonitis of wrists
  • Bone spur of bilateral ankles
  • Bone spur of bilateral feet
  • Bone spur of bilateral hands
  • Capsulitis
  • Capsulitis of bilateral ankles
  • Capsulitis of bilateral metatarsophalangeal joints
  • Capsulitis of bilateral mtp joint
  • Capsulitis of bilateral tarsi
  • Capsulitis of bilateral tarsus
  • Capsulitis of left ankle
  • Capsulitis of left metatarsophalangeal joint
  • Capsulitis of left mtp joint
  • Capsulitis of left tarsus
  • Capsulitis of metatarsophalangeal joint
  • Capsulitis of metatarsophalangeal joint of left foot
  • Capsulitis of metatarsophalangeal joint of right foot
  • Capsulitis of right ankle
  • Capsulitis of right metatarsophalangeal joint
  • Capsulitis of right mtp joint
  • Capsulitis of right tarsus
  • Enthesopathy
  • Enthesopathy of ankle
  • Enthesopathy of bilateral ankles
  • Enthesopathy of bilateral elbows
  • Enthesopathy of bilateral feet
  • Enthesopathy of bilateral fingers
  • Enthesopathy of bilateral hands
  • Enthesopathy of bilateral toes
  • Enthesopathy of finger
  • Enthesopathy of foot or toes
  • Enthesopathy of foot region
  • Enthesopathy of hand
  • Enthesopathy of hip region
  • Enthesopathy of left ankle
  • Enthesopathy of left finger
  • Enthesopathy of left foot
  • Enthesopathy of left hand
  • Enthesopathy of left toe
  • Enthesopathy of left wrist
  • Enthesopathy of right ankle
  • Enthesopathy of right finger
  • Enthesopathy of right foot
  • Enthesopathy of right hand
  • Enthesopathy of right toe
  • Enthesopathy of right wrist
  • Enthesopathy of tarsus
  • Enthesopathy of toe
  • Periarthritis
  • Tendinitis
  • Tendinitis and/or tenosynovitis of the ankle region
  • Tendinitis of bilateral ankles
  • Tendinitis of bilateral elbows
  • Tendinitis of bilateral feet
  • Tendinitis of bilateral fingers
  • Tendinitis of bilateral forearms
  • Tendinitis of bilateral hand extensor tendons
  • Tendinitis of bilateral hand flexor tendons
  • Tendinitis of bilateral hands
  • Tendinitis of bilateral hips
  • Tendinitis of bilateral second metatarsophalangeal joints
  • Tendinitis of bilateral second mtp joint
  • Tendinitis of bilateral wrists
  • Tendinitis of extensor tendon of hand
  • Tendinitis of extensor tendon of left hand
  • Tendinitis of extensor tendon of right hand
  • Tendinitis of finger
  • Tendinitis of finger of left hand
  • Tendinitis of flexor tendon of hand
  • Tendinitis of flexor tendon of left hand
  • Tendinitis of flexor tendon of right hand
  • Tendinitis of foot
  • Tendinitis of forearm
  • Tendinitis of hand
  • Tendinitis of left ankle
  • Tendinitis of left elbow
  • Tendinitis of left finger
  • Tendinitis of left foot
  • Tendinitis of left forearm
  • Tendinitis of left hand
  • Tendinitis of left hand extensor tendon
  • Tendinitis of left hand flexor tendon
  • Tendinitis of left hip
  • Tendinitis of left second metatarsophalangeal joint
  • Tendinitis of left second mtp joint
  • Tendinitis of left wrist
  • Tendinitis of right ankle
  • Tendinitis of right elbow
  • Tendinitis of right finger
  • Tendinitis of right foot
  • Tendinitis of right forearm
  • Tendinitis of right hand
  • Tendinitis of right hand extensor tendon
  • Tendinitis of right hand flexor tendon
  • Tendinitis of right hip
  • Tendinitis of right second metatarsophalangeal joint
  • Tendinitis of right second mtp joint
  • Tendinitis of right wrist
  • Tendonitis
  • Tendonitis hand, extensor tendon
  • Tendonitis hand, flexor tendon
  • Tendonitis of ankle
  • Tendonitis of bilateral forearms
  • Tendonitis of finger
  • Tendonitis of finger of right hand
  • Tendonitis of foot
  • Tendonitis of hand
  • Tendonitis of left ankle
  • Tendonitis of left foot
  • Tendonitis of left wrist
  • Tendonitis of right ankle
  • Tendonitis of right foot
  • Tendonitis of right wrist
Clinical Information
  • Bony outgrowth usually found around joints and often seen in conditions such as arthritis.
  • Disorder occurring at the site of insertion of tendons or ligaments into bones or joint capsules
  • Inflammation of a tendon, usually resulting from an overuse injury. It is characterized by swelling of the tendon, tenderness around the inflamed tendon, and pain while moving the affected area of the body.
  • Inflammation of tendons. It is characterized by the degeneration of tendons accompanied by an inflammatory repair response, fibroblastic proliferation, and formation of granulation tissue. Tendinitis is not a clinical diagnosis and can be confirmed only by histopathological findings.
  • Inflammation of the tissues around a joint. (Dorland, 27th ed)
  • Tendons are the tough cords of tissue that attach muscles to bones. They help your muscles move your bones. Tendinitis means inflammation of a tendon. It causes pain and tenderness near a joint. It usually occurs in the shoulders, elbows, knees, hips, heels or wrists. Depending on where it happens, it may have a special name, such as tennis elbow.injuries and overuse are common causes of tendinitis. Cross-training, stretching and decreasing your intensity when you exercise might help prevent tendinitis. Certain diseases, such as rheumatoid arthritis, also can cause it. You can usually treat tendinitis with rest, ice and medicine to relieve pain and decrease swelling. Other treatments include ultrasound, physical therapy, steroid injections and surgery.
ICD-10-CM M77.9 is grouped within Diagnostic Related Group(s) (MS-DRG v40.0):
  • 557 Tendonitis, myositis and bursitis with mcc
  • 558 Tendonitis, myositis and bursitis without mcc

Convert M77.9 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change
Code annotations containing back-references to M77.9:
  • Type 1 Excludes: M67
    ICD-10-CM Diagnosis Code M67

    Other disorders of synovium and tendon

      2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • palmar fascial fibromatosis [Dupuytren] (M72.0)
    • tendinitis NOS (M77.9-)
    • xanthomatosis localized to tendons (E78.2)

Diagnosis Index entries containing back-references to M77.9:

ICD-10-CM Codes Adjacent To M77.9
M77.32 …… left foot
M77.4 Metatarsalgia
M77.40 …… unspecified foot
M77.41 …… right foot
M77.42 …… 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 Other enthesopathies, not elsewhere classified
M77.9 Enthesopathy, unspecified
M79 Other and unspecified soft tissue disorders, not elsewhere classified
M79.0 Rheumatism, unspecified
M79.1 Myalgia
M79.10 …… unspecified site
M79.11 …… of mastication muscle
M79.12 …… of auxiliary muscles, head and neck
M79.18 …… other site
M79.2 Neuralgia and neuritis, unspecified
M79.3 Panniculitis, unspecified
M79.4 Hypertrophy of (infrapatellar) fat pad

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.