M89.78 – Major osseous defect, other site
ICD-10-CM 2027 diagnosis code · Other osteopathies
ICD-10-CM code
M89.78
- Code
M89.78(claims format:M8978)- Description
- Major osseous defect, other site
- 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
- M86-M90 Other osteopathies
- Parent codes
- M89 › M89.7
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 M89.78
Entries in the ICD-10-CM alphabetic index that lead to this code:
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
- M89.77 – Major osseous defect, ankle and footHeader
- M89.79 – Major osseous defect, multiple sitesBillable
Frequently asked questions
What is ICD-10 code M89.78?
M89.78 is the ICD-10-CM code for major osseous defect, other site, in the block M86-M90 (Other osteopathies).
Is M89.78 a billable code?
Yes. M89.78 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does M89.78 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.