2026 ICD-10-CM Diagnosis Code M85Other disorders of bone density and structure

ICD-10-CM Codes›M00–M99›M80-M85›M85

ICD-10-CM M85
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M85 is a non-billable ICD-10-CM category code for other disorders of bone density and structure, so it cannot be submitted on claims. Use a more specific code from this category instead, such as M85.00, M85.011, M85.012, and M85.019.

Code Identity

ICD-10-CM Code
M85
Billable Status
No — Non-Billable Category
Code Describes
Other disorders of bone density and structure
Short Description
Other disorders of bone density and structure
Same as the full description in the CMS dataset.
Chapter
M80-M85
Disorders of bone density and structure

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM80-M85Disorders of bone density and structure
CategoryM85Other disorders of bone density and structure
This CodeM85Other disorders of bone density and structure

Specific Coding for Other disorders of bone density and structureOverview

Non-specific codes like M85 require more characters. Use one of these billable codes instead:

  • M85.0 for Fibrous dysplasia (monostotic)

  • Use M85.00 for Fibrous dysplasia (monostotic), unspecified site

  • M85.01 for Fibrous dysplasia (monostotic), shoulder

  • M85.02 for Fibrous dysplasia (monostotic), upper arm

  • M85.03 for Fibrous dysplasia (monostotic), forearm

  • M85.04 for Fibrous dysplasia (monostotic), hand

  • M85.05 for Fibrous dysplasia (monostotic), thigh

  • M85.06 for Fibrous dysplasia (monostotic), lower leg

  • M85.07 for Fibrous dysplasia (monostotic), ankle and foot

  • Use M85.08 for Fibrous dysplasia (monostotic), other site

  • Use M85.09 for Fibrous dysplasia (monostotic), multiple sites

  • M85.1 for Skeletal fluorosis

  • Use M85.10 for Skeletal fluorosis, unspecified site

  • M85.11 for Skeletal fluorosis, shoulder

  • M85.12 for Skeletal fluorosis, upper arm

  • M85.13 for Skeletal fluorosis, forearm

  • M85.14 for Skeletal fluorosis, hand

  • M85.15 for Skeletal fluorosis, thigh

  • M85.16 for Skeletal fluorosis, lower leg

  • M85.17 for Skeletal fluorosis, ankle and foot

  • Use M85.18 for Skeletal fluorosis, other site

  • Use M85.19 for Skeletal fluorosis, multiple sites

  • Use M85.2 for Hyperostosis of skull

  • M85.3 for Osteitis condensans

  • Use M85.30 for Osteitis condensans, unspecified site

  • M85.31 for Osteitis condensans, shoulder

  • M85.32 for Osteitis condensans, upper arm

  • M85.33 for Osteitis condensans, forearm

  • M85.34 for Osteitis condensans, hand

  • M85.35 for Osteitis condensans, thigh

  • M85.36 for Osteitis condensans, lower leg

  • M85.37 for Osteitis condensans, ankle and foot

  • Use M85.38 for Osteitis condensans, other site

  • Use M85.39 for Osteitis condensans, multiple sites

  • M85.4 for Solitary bone cyst

  • Use M85.40 for Solitary bone cyst, unspecified site

  • M85.41 for Solitary bone cyst, shoulder

  • M85.42 for Solitary bone cyst, humerus

  • M85.43 for Solitary bone cyst, ulna and radius

  • M85.44 for Solitary bone cyst, hand

  • M85.45 for Solitary bone cyst, pelvis

  • M85.46 for Solitary bone cyst, tibia and fibula

  • M85.47 for Solitary bone cyst, ankle and foot

  • Use M85.48 for Solitary bone cyst, other site

  • M85.5 for Aneurysmal bone cyst

  • Use M85.50 for Aneurysmal bone cyst, unspecified site

  • M85.51 for Aneurysmal bone cyst, shoulder

  • M85.52 for Aneurysmal bone cyst, upper arm

  • M85.53 for Aneurysmal bone cyst, forearm

  • M85.54 for Aneurysmal bone cyst, hand

  • M85.55 for Aneurysmal bone cyst, thigh

  • M85.56 for Aneurysmal bone cyst, lower leg

  • M85.57 for Aneurysmal bone cyst, ankle and foot

  • Use M85.58 for Aneurysmal bone cyst, other site

  • Use M85.59 for Aneurysmal bone cyst, multiple sites

  • M85.6 for Other cyst of bone

  • Use M85.60 for Other cyst of bone, unspecified site

  • M85.61 for Other cyst of bone, shoulder

  • M85.62 for Other cyst of bone, upper arm

  • M85.63 for Other cyst of bone, forearm

  • M85.64 for Other cyst of bone, hand

  • M85.65 for Other cyst of bone, thigh

  • M85.66 for Other cyst of bone, lower leg

  • M85.67 for Other cyst of bone, ankle and foot

  • Use M85.68 for Other cyst of bone, other site

  • Use M85.69 for Other cyst of bone, multiple sites

  • M85.8 for Other specified disorders of bone density and structure

  • Use M85.80 for Other specified disorders of bone density and structure, unspecified site

  • M85.81 for Other specified disorders of bone density and structure, shoulder

  • M85.82 for Other specified disorders of bone density and structure, upper arm

  • M85.83 for Other specified disorders of bone density and structure, forearm

  • M85.84 for Other specified disorders of bone density and structure, hand

  • M85.85 for Other specified disorders of bone density and structure, thigh

  • M85.86 for Other specified disorders of bone density and structure, lower leg

  • M85.87 for Other specified disorders of bone density and structure, ankle and foot

  • Use M85.88 for Other specified disorders of bone density and structure, other site

  • Use M85.89 for Other specified disorders of bone density and structure, multiple sites

  • Use M85.9 for Disorder of bone density and structure, unspecified

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Type 1 Excludes

  • osteogenesis imperfecta Q78.0
  • osteopetrosis Q78.2
  • osteopoikilosis Q78.8
  • polyostotic fibrous dysplasia Q78.1

Patient EducationClinical

Bone Density

Your bones are made of living tissue. To keep them strong, your body breaks down old bone and replaces it with new bone. But when more bone is broken down than replaced, you lose bone density, also called bone mass. Bone density is a measure of the amount of calcium and other minerals in bone. Bones containing more minerals are denser.

The full article covers:

  • What is bone density?
  • What can make you lose bone density?
  • Is there a test to measure your bone health?
  • How can I keep my bones strong?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About M85Overview

Is M85 (Other disorders of bone density and structure) a billable code?

No. This is a category header that groups the codes for other disorders of bone density and structure, and headers cannot be submitted on claims. Claims for other disorders of bone density and structure need a more specific code from this category, such as M85.00, M85.011, and M85.012.