M85
⚠ Non-billable
Other disorders of bone density and structure
ICD-10-CM · FY2026 · Diseases of the Musculoskeletal System and Connective Tissue
Code
M85
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Diseases of the Musculoskeletal System and Connective Tissue
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Official coding notes
From CMS's ICD-10-CM Tabular List.
Excludes1 — never code together
- osteogenesis imperfecta (Q78.0)
- osteopetrosis (Q78.2)
- osteopoikilosis (Q78.8)
- polyostotic fibrous dysplasia (Q78.1)
Frequently asked questions
What is ICD-10 code M85?
ICD-10-CM code M85 represents Other disorders of bone density and structure. It is a non-billable header code requiring a more specific subcategory in the Diseases of the Musculoskeletal System and Connective Tissue chapter, effective October 1, 2025 – September 30, 2026.
Is M85 billable?
No. M85 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is M85 in?
M85 belongs to the Diseases of the Musculoskeletal System and Connective Tissue chapter (M00–M99) of ICD-10-CM.
Related codes in the M85 category
M85.0
Fibrous dysplasia (monostotic)
Non-billable
M85.1
Skeletal fluorosis
Non-billable
M85.00
Fibrous dysplasia (monostotic), unspecified site
Billable
M85.01
Fibrous dysplasia (monostotic), shoulder
Non-billable
M85.02
Fibrous dysplasia (monostotic), upper arm
Non-billable
M85.03
Fibrous dysplasia (monostotic), forearm
Non-billable
M85.04
Fibrous dysplasia (monostotic), hand
Non-billable
M85.05
Fibrous dysplasia (monostotic), thigh
Non-billable
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