M77 — Other enthesopathies
Is M77 billable?
No — M77 is a non-billable header code. M77 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 20 billable codes beneath M77.
Billable codes under this header
- M77.8Other enthesopathies, not elsewhere classified
- M77.9Enthesopathy, unspecified
- M77.00Medial epicondylitis, unspecified elbow
- M77.01Medial epicondylitis, right elbow
- M77.02Medial epicondylitis, left elbow
- M77.10Lateral epicondylitis, unspecified elbow
- M77.11Lateral epicondylitis, right elbow
- M77.12Lateral epicondylitis, left elbow
- M77.20Periarthritis, unspecified wrist
- M77.21Periarthritis, right wrist
- M77.22Periarthritis, left wrist
- M77.30Calcaneal spur, unspecified foot
- M77.31Calcaneal spur, right foot
- M77.32Calcaneal spur, left foot
- M77.40Metatarsalgia, unspecified foot
- M77.41Metatarsalgia, right foot
- M77.42Metatarsalgia, left foot
- M77.50Other enthesopathy of unspecified foot and ankle
- M77.51Other enthesopathy of right foot and ankle
- M77.52Other enthesopathy of left foot and ankle
M77 at a glance
| Code | M77 |
|---|---|
| Description | Other enthesopathies |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes1 — never code together
The conditions below can never be reported together with M77 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- bursitis NOS (M71.9-)
Excludes2 — not included here
The conditions below are not part of M77, but a patient may have both at the same time. When documentation supports it, M77 and the excluded code may both be reported.
Excludes2 — not included here — inherited from Chapter 13
The conditions below are not part of M77, but a patient may have both at the same time. When documentation supports it, M77 and the excluded code may both be reported.
- 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)
What codes fall under M77? (8)
- M77.0Medial epicondylitisnot billable
- M77.1Lateral epicondylitisnot billable
- M77.2Periarthritis of wristnot billable
- M77.3Calcaneal spurnot billable
- M77.4Metatarsalgianot billable
- M77.5Other enthesopathy of foot and anklenot billable
- M77.8Other enthesopathies, not elsewhere classified
- M77.9Enthesopathy, unspecified
How long has M77 existed?
M77 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with M77?
ICD-10-CM declares these codes mutually exclusive with M77 — exactly one of each pair can be correct for a given encounter.