ICD-10-CM 2027
ICD-10 code for major osseous defect
From the official ICD-10-CM alphabetic index entry “Defect, defective › major osseous”. Page updated September 29, 2026.
About coding major osseous defect
The ICD-10-CM code for major osseous defect is M89.70 (Major osseous defect, unspecified site). The official index lists 25 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on M89.70.
Within M89.7, choose M89.70 (unspecified site) only when documentation doesn't support a more specific option: shoulder region (M89.71), humerus (M89.72), forearm (M89.73), hand (M89.74), pelvic region and thigh (M89.75), lower leg (M89.76), ankle and foot (M89.77), other site (M89.78) and 1 more.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 553 (Bone Diseases and Arthropathies with MCC, relative weight 1.2494) and DRG 554 (Bone Diseases and Arthropathies without MCC, relative weight 0.8331), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific major osseous defect codes (official index)
- ankle M89.77 — Major osseous defect, ankle and foot
- carpus M89.74 — Major osseous defect, hand
- clavicle M89.71 — Major osseous defect, shoulder region
- femur M89.75 — Major osseous defect, pelvic region and thigh
- fibula M89.76 — Major osseous defect, lower leg
- fingers M89.74 — Major osseous defect, hand
- foot M89.77 — Major osseous defect, ankle and foot
- forearm M89.73 — Major osseous defect, forearm
- hand M89.74 — Major osseous defect, hand
- humerus M89.72 — Major osseous defect, humerus
- lower leg M89.76 — Major osseous defect, lower leg
- metacarpus M89.74 — Major osseous defect, hand
- metatarsus M89.77 — Major osseous defect, ankle and foot
- multiple sites M89.79 — Major osseous defect, multiple sites
- pelvic region M89.75 — Major osseous defect, pelvic region and thigh
- pelvis M89.75 — Major osseous defect, pelvic region and thigh
- radius M89.73 — Major osseous defect, forearm
- scapula M89.71 — Major osseous defect, shoulder region
- shoulder region M89.71 — Major osseous defect, shoulder region
- specified NEC M89.78 — Major osseous defect, other site
- tarsus M89.77 — Major osseous defect, ankle and foot
- thigh M89.75 — Major osseous defect, pelvic region and thigh
- tibia M89.76 — Major osseous defect, lower leg
- toes M89.77 — Major osseous defect, ankle and foot
- ulna M89.73 — Major osseous defect, forearm
Common questions about major osseous defect ICD-10 codes
What is the ICD-10 code for major osseous defect?
- M89.70 — Major osseous defect, unspecified site. More specific codes apply when the documentation supports them: M89.77, M89.74, M89.71, M89.75 and others below.
What is the ICD-10 code for ankle major osseous defect?
- M89.77 — Major osseous defect, ankle and foot (header code; choose a more specific subcode).
What is the ICD-10 code for carpus major osseous defect?
- M89.74 — Major osseous defect, hand (header code; choose a more specific subcode).
What is the ICD-10 code for clavicle major osseous defect?
- M89.71 — Major osseous defect, shoulder region (header code; choose a more specific subcode).
What is the ICD-10 code for femur major osseous defect?
- M89.75 — Major osseous defect, pelvic region and thigh (header code; choose a more specific subcode).
What is the ICD-10 code for fibula major osseous defect?
- M89.76 — Major osseous defect, lower leg (header code; choose a more specific subcode).
What is the ICD-10 code for fingers major osseous defect?
- M89.74 — Major osseous defect, hand (header code; choose a more specific subcode).
Is M89.70 billable?
- Yes. M89.70 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M89.70 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M89.70 as a principal diagnosis.
Is M89.70 a CC or MCC?
- No. M89.70 is neither a CC nor an MCC under MS-DRG v44.0.