M77.8 – Other enthesopathies, not elsewhere classified

ICD-10-CM 2027 diagnosis code · Other soft tissue disorders

Billable code

ICD-10-CM code M77.8

Code: M77.8 (claims format: M778)
Description: Other enthesopathies, not elsewhere classified
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 13. Diseases of the musculoskeletal system and connective tissue (M00-M99)
Block: M70-M79 Other soft tissue disorders
Parent codes: M77

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

M77 – Other enthesopathies

Excludes1 (not coded here):

bursitis NOS (M71.9-)

Excludes2 (not included here):

bursitis due to use, overuse and pressure (M70.-)
osteophyte (M25.7)
spinal enthesopathy (M46.0-)

Index terms for M77.8

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in M77

M77.0 – Medial epicondylitisHeader
M77.1 – Lateral epicondylitisHeader
M77.2 – Periarthritis of wristHeader
M77.3 – Calcaneal spurHeader
M77.4 – MetatarsalgiaHeader
M77.5 – Other enthesopathy of foot and ankleHeader
M77.9 – Enthesopathy, unspecifiedBillable

Frequently asked questions

What is ICD-10 code M77.8?

M77.8 is the ICD-10-CM code for other enthesopathies, not elsewhere classified, in the block M70-M79 (Other soft tissue disorders).

Is M77.8 a billable code?

Yes. M77.8 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does M77.8 belong to?

It belongs to category M77 – Other enthesopathies.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.