ICD-10-CM 2027
ICD-10 code for bone disorder
From the official ICD-10-CM alphabetic index entry “Disorder (of) › bone”. Page updated September 29, 2026.
About coding bone disorder
The ICD-10-CM code for bone disorder is M89.9 (Disorder of bone, unspecified). The official index lists 56 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on M89.9.
Within M89, choose M89.9 (Disorder of bone, unspecified) only when documentation doesn't support a more specific option: Algoneurodystrophy (M89.0), physeal arrest (M89.1), development and growth (M89.2), hypertrophy of bone (M89.3), other hypertrophic osteoarthropathy (M89.4), osteolysis (M89.5), osteopathy after poliomyelitis (M89.6), major osseous defect (M89.7) 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 564 (Other Musculoskeletal System and Connective Tissue Diagnoses with MCC, relative weight 1.4908), DRG 565 (Other Musculoskeletal System and Connective Tissue Diagnoses with CC, relative weight 0.9783) and DRG 566 (Other Musculoskeletal System and Connective Tissue Diagnoses without CC/MCC, relative weight 0.7378), 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 bone disorder codes (official index)
- continuity M84.9 — Disorder of continuity of bone, unspecified
- specified type NEC M84.80 — Other disorders of continuity of bone, unspecified site
- ankle M84.87 — Other disorders of continuity of bone, ankle and foot
- fibula M84.86 — Other disorders of continuity of bone, tibia and fibula
- foot M84.87 — Other disorders of continuity of bone, ankle and foot
- hand M84.84 — Other disorders of continuity of bone, hand
- humerus M84.82 — Other disorders of continuity of bone, humerus
- neck M84.88 — Other disorders of continuity of bone, other site
- pelvis M84.859 — Other disorders of continuity of bone, unspecified pelvic region and thigh
- radius M84.83 — Other disorders of continuity of bone, ulna and radius
- rib M84.88 — Other disorders of continuity of bone, other site
- shoulder M84.81 — Other disorders of continuity of bone, shoulder
- skull M84.88 — Other disorders of continuity of bone, other site
- thigh M84.85 — Other disorders of continuity of bone, pelvic region and thigh
- tibia M84.86 — Other disorders of continuity of bone, tibia and fibula
- ulna M84.83 — Other disorders of continuity of bone, ulna and radius
- vertebra M84.88 — Other disorders of continuity of bone, other site
- density and structure M85.9 — Disorder of bone density and structure, unspecified
- cyst
- aneurysmal
- solitary
- diffuse idiopathic skeletal hyperostosis
- fibrous dysplasia (monostotic)
- fluorosis
- hyperostosis of skull M85.2 — Hyperostosis of skull
- osteitis condensans
- specified type NEC M85.8 — Other specified disorders of bone density and structure
- ankle M85.87 — Other specified disorders of bone density and structure, ankle and foot
- foot M85.87 — Other specified disorders of bone density and structure, ankle and foot
- forearm M85.83 — Other specified disorders of bone density and structure, forearm
- hand M85.84 — Other specified disorders of bone density and structure, hand
- lower leg M85.86 — Other specified disorders of bone density and structure, lower leg
- multiple sites M85.89 — Other specified disorders of bone density and structure, multiple sites
- neck M85.88 — Other specified disorders of bone density and structure, other site
- rib M85.88 — Other specified disorders of bone density and structure, other site
- shoulder M85.81 — Other specified disorders of bone density and structure, shoulder
- skull M85.88 — Other specified disorders of bone density and structure, other site
- thigh M85.85 — Other specified disorders of bone density and structure, thigh
- upper arm M85.82 — Other specified disorders of bone density and structure, upper arm
- vertebra M85.88 — Other specified disorders of bone density and structure, other site
- development and growth NEC M89.20 — Other disorders of bone development and growth, unspecified site
- carpus M89.24 — Other disorders of bone development and growth, hand
- clavicle M89.21 — Other disorders of bone development and growth, shoulder
- femur M89.25 — Other disorders of bone development and growth, femur
- fibula M89.26 — Other disorders of bone development and growth, tibia and fibula
- finger M89.24 — Other disorders of bone development and growth, hand
- humerus M89.22 — Other disorders of bone development and growth, humerus
- ilium M89.28 — Other disorders of bone development and growth, other site
- ischium M89.28 — Other disorders of bone development and growth, other site
- metacarpus M89.24 — Other disorders of bone development and growth, hand
- metatarsus M89.27 — Other disorders of bone development and growth, ankle and foot
- multiple sites M89.29 — Other disorders of bone development and growth, multiple sites
- neck M89.28 — Other disorders of bone development and growth, other site
- radius M89.23 — Other disorders of bone development and growth, ulna and radius
- rib M89.28 — Other disorders of bone development and growth, other site
- scapula M89.21 — Other disorders of bone development and growth, shoulder
- skull M89.28 — Other disorders of bone development and growth, other site
- tarsus M89.27 — Other disorders of bone development and growth, ankle and foot
- tibia M89.26 — Other disorders of bone development and growth, tibia and fibula
- toe M89.27 — Other disorders of bone development and growth, ankle and foot
- ulna M89.23 — Other disorders of bone development and growth, ulna and radius
- vertebra M89.28 — Other disorders of bone development and growth, other site
- specified type NEC M89.8X — Other specified disorders of bone
Common questions about bone disorder ICD-10 codes
What is the ICD-10 code for bone disorder?
- M89.9 — Disorder of bone, unspecified. More specific codes apply when the documentation supports them: M84.9, M84.80, M84.87, M84.86 and others below.
What is the ICD-10 code for continuity bone disorder?
- M84.9 — Disorder of continuity of bone, unspecified.
What is the ICD-10 code for density and structure bone disorder?
- M85.9 — Disorder of bone density and structure, unspecified.
What is the ICD-10 code for development and growth nec bone disorder?
- M89.20 — Other disorders of bone development and growth, unspecified site.
Is M89.9 billable?
- Yes. M89.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M89.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M89.9 as a principal diagnosis.
Is M89.9 a CC or MCC?
- No. M89.9 is neither a CC nor an MCC under MS-DRG v44.0.