FY2027 ICD-10-CM reference
M77: Other enthesopathies
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Other enthesopathies. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Nonbillable heading. Verified against the official FY2027 order file.
More specific FY2027 codes
- M77.0: Medial epicondylitisNonbillable heading
- M77.1: Lateral epicondylitisNonbillable heading
- M77.2: Periarthritis of wristNonbillable heading
- M77.3: Calcaneal spurNonbillable heading
- M77.4: MetatarsalgiaNonbillable heading
- M77.5: Other enthesopathy of foot and ankleNonbillable heading
- M77.8: Other enthesopathies, not elsewhere classifiedBillable code
- M77.9: Enthesopathy, unspecifiedBillable code
FY2027 Tabular instructions
Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.
Instructional note
Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition
Source: M00-M99 (chapter, inherited).
Excludes2
arthropathic psoriasis (L40.5-)
Source: M00-M99 (chapter, inherited).
Excludes2
certain conditions originating in the perinatal period (P04-P96)
Source: M00-M99 (chapter, inherited).
Excludes2
certain infectious and parasitic diseases (A00-B99)
Source: M00-M99 (chapter, inherited).
Excludes2
compartment syndrome (traumatic) (T79.A-)
Source: M00-M99 (chapter, inherited).
Excludes2
complications of pregnancy, childbirth and the puerperium (O00-O9A)
Source: M00-M99 (chapter, inherited).
Excludes2
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
Source: M00-M99 (chapter, inherited).
Excludes2
endocrine, nutritional and metabolic diseases (E00-E88)
Source: M00-M99 (chapter, inherited).
Excludes2
injury, poisoning and certain other consequences of external causes (S00-T88)
Source: M00-M99 (chapter, inherited).
Excludes2
neoplasms (C00-D49)
Source: M00-M99 (chapter, inherited).
Excludes2
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Source: M00-M99 (chapter, inherited).
Excludes1
bursitis NOS (M71.9-)
Source: M77 (category, direct).
Excludes2
bursitis due to use, overuse and pressure (M70.-)
Source: M77 (category, direct).
Excludes2
osteophyte (M25.7)
Source: M77 (category, direct).
Excludes2
spinal enthesopathy (M46.0-)
Source: M77 (category, direct).
Compare the FY2027 additions, removals and billable-status changes
What does M77 mean in FY2027?
The official ICD-10-CM descriptor is Other enthesopathies. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Is M77 billable in FY2027?
The FY2027 order file marks M77 as a nonbillable heading. Select a complete billable child code.
Does M77 map to an HCC?
Risk-model mapping is not applicable to this nonbillable heading. Check a complete billable child code.
Source: CMS FY2027 ICD-10-CM order file. Read the FY2027 Official Guidelines.
Review the FY2026 April edition