M89.77 – Major osseous defect, ankle and foot
ICD-10-CM 2027 diagnosis code · Other osteopathies
ICD-10-CM code
M89.77
- Code
M89.77(claims format:M8977)- Description
- Major osseous defect, ankle and foot
- Billable
- No – use a more specific code below
- 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
- M86-M90 Other osteopathies
- Parent codes
- M89 › M89.7
Billable codes under M89.77
M89.77 is a header code and cannot be used on claims. Choose the most specific code:
Notes for M89.77
Applicable to:
- Major osseous defect of metatarsus, tarsus, toes
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
M89.7 – Major osseous defect
Code first:
Block M86-M90
Excludes1 (not coded here):
- postprocedural osteopathies (M96.-)
Index terms for M89.77
Entries in the ICD-10-CM alphabetic index that lead to this code:
- Defect, defective, major osseous, foot
- Defect, defective, major osseous, toes
- Defect, defective, major osseous, ankle
- Defect, defective, osseous, major, foot
- Defect, defective, osseous, major, toes
- Defect, defective, major osseous, tarsus
- Defect, defective, osseous, major, ankle
- Defect, defective, osseous, major, tarsus
- Defect, defective, major osseous, metatarsus
- Defect, defective, osseous, major, metatarsus
Related codes in M89.7
- M89.70 – Major osseous defect, unspecified siteBillable
- M89.71 – Major osseous defect, shoulder regionHeader
- M89.72 – Major osseous defect, humerusHeader
- M89.73 – Major osseous defect, forearmHeader
- M89.74 – Major osseous defect, handHeader
- M89.75 – Major osseous defect, pelvic region and thighHeader
- M89.76 – Major osseous defect, lower legHeader
- M89.78 – Major osseous defect, other siteBillable
- M89.79 – Major osseous defect, multiple sitesBillable
Frequently asked questions
What is ICD-10 code M89.77?
M89.77 is the ICD-10-CM code for major osseous defect, ankle and foot, in the block M86-M90 (Other osteopathies).
Is M89.77 a billable code?
No. M89.77 is a header code with more specific child codes; report one of the billable codes listed above.
What category does M89.77 belong to?
It belongs to category M89 – Other disorders of bone.
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.