2025 ICD-10-CM Diagnosis Code M85

Other disorders of bone density and structure

ICD-10-CM Code:
M85
ICD-10 Code for:
Other disorders of bone density and structure
Is Billable?
Not Valid for Submission
Code Navigator:

M85 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of other disorders of bone density and structure. The code is not specific and is NOT valid for the year 2025 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Specific Coding Applicable to Other disorders of bone density and structure

Non-specific codes like M85 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10-CM codes with a higher level of specificity when coding for other disorders of bone density and structure:

  • M85.0 for Fibrous dysplasia (monostotic) - NON-BILLABLE CODE

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

  • M85.01 for Fibrous dysplasia (monostotic), shoulder - NON-BILLABLE CODE

  • M85.02 for Fibrous dysplasia (monostotic), upper arm - NON-BILLABLE CODE

  • M85.03 for Fibrous dysplasia (monostotic), forearm - NON-BILLABLE CODE

  • M85.04 for Fibrous dysplasia (monostotic), hand - NON-BILLABLE CODE

  • M85.05 for Fibrous dysplasia (monostotic), thigh - NON-BILLABLE CODE

  • M85.06 for Fibrous dysplasia (monostotic), lower leg - NON-BILLABLE CODE

  • M85.07 for Fibrous dysplasia (monostotic), ankle and foot - NON-BILLABLE CODE

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

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

  • M85.1 for Skeletal fluorosis - NON-BILLABLE CODE

  • Use M85.10 for Skeletal fluorosis, unspecified site - BILLABLE CODE

  • M85.11 for Skeletal fluorosis, shoulder - NON-BILLABLE CODE

  • M85.12 for Skeletal fluorosis, upper arm - NON-BILLABLE CODE

  • M85.13 for Skeletal fluorosis, forearm - NON-BILLABLE CODE

  • M85.14 for Skeletal fluorosis, hand - NON-BILLABLE CODE

  • M85.15 for Skeletal fluorosis, thigh - NON-BILLABLE CODE

  • M85.16 for Skeletal fluorosis, lower leg - NON-BILLABLE CODE

  • M85.17 for Skeletal fluorosis, ankle and foot - NON-BILLABLE CODE

  • Use M85.18 for Skeletal fluorosis, other site - BILLABLE CODE

  • Use M85.19 for Skeletal fluorosis, multiple sites - BILLABLE CODE

  • Use M85.2 for Hyperostosis of skull - BILLABLE CODE

  • M85.3 for Osteitis condensans - NON-BILLABLE CODE

  • Use M85.30 for Osteitis condensans, unspecified site - BILLABLE CODE

  • M85.31 for Osteitis condensans, shoulder - NON-BILLABLE CODE

  • M85.32 for Osteitis condensans, upper arm - NON-BILLABLE CODE

  • M85.33 for Osteitis condensans, forearm - NON-BILLABLE CODE

  • M85.34 for Osteitis condensans, hand - NON-BILLABLE CODE

  • M85.35 for Osteitis condensans, thigh - NON-BILLABLE CODE

  • M85.36 for Osteitis condensans, lower leg - NON-BILLABLE CODE

  • M85.37 for Osteitis condensans, ankle and foot - NON-BILLABLE CODE

  • Use M85.38 for Osteitis condensans, other site - BILLABLE CODE

  • Use M85.39 for Osteitis condensans, multiple sites - BILLABLE CODE

  • M85.4 for Solitary bone cyst - NON-BILLABLE CODE

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

  • M85.41 for Solitary bone cyst, shoulder - NON-BILLABLE CODE

  • M85.42 for Solitary bone cyst, humerus - NON-BILLABLE CODE

  • M85.43 for Solitary bone cyst, ulna and radius - NON-BILLABLE CODE

  • M85.44 for Solitary bone cyst, hand - NON-BILLABLE CODE

  • M85.45 for Solitary bone cyst, pelvis - NON-BILLABLE CODE

  • M85.46 for Solitary bone cyst, tibia and fibula - NON-BILLABLE CODE

  • M85.47 for Solitary bone cyst, ankle and foot - NON-BILLABLE CODE

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

  • M85.5 for Aneurysmal bone cyst - NON-BILLABLE CODE

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

  • M85.51 for Aneurysmal bone cyst, shoulder - NON-BILLABLE CODE

  • M85.52 for Aneurysmal bone cyst, upper arm - NON-BILLABLE CODE

  • M85.53 for Aneurysmal bone cyst, forearm - NON-BILLABLE CODE

  • M85.54 for Aneurysmal bone cyst, hand - NON-BILLABLE CODE

  • M85.55 for Aneurysmal bone cyst, thigh - NON-BILLABLE CODE

  • M85.56 for Aneurysmal bone cyst, lower leg - NON-BILLABLE CODE

  • M85.57 for Aneurysmal bone cyst, ankle and foot - NON-BILLABLE CODE

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

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

  • M85.6 for Other cyst of bone - NON-BILLABLE CODE

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

  • M85.61 for Other cyst of bone, shoulder - NON-BILLABLE CODE

  • M85.62 for Other cyst of bone, upper arm - NON-BILLABLE CODE

  • M85.63 for Other cyst of bone, forearm - NON-BILLABLE CODE

  • M85.64 for Other cyst of bone, hand - NON-BILLABLE CODE

  • M85.65 for Other cyst of bone, thigh - NON-BILLABLE CODE

  • M85.66 for Other cyst of bone, lower leg - NON-BILLABLE CODE

  • M85.67 for Other cyst of bone, ankle and foot - NON-BILLABLE CODE

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

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

  • M85.8 for Other specified disorders of bone density and structure - NON-BILLABLE CODE

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

  • M85.81 for Other specified disorders of bone density and structure, shoulder - NON-BILLABLE CODE

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

  • M85.83 for Other specified disorders of bone density and structure, forearm - NON-BILLABLE CODE

  • M85.84 for Other specified disorders of bone density and structure, hand - NON-BILLABLE CODE

  • M85.85 for Other specified disorders of bone density and structure, thigh - NON-BILLABLE CODE

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

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

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

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

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

Code Classification

  • Diseases of the musculoskeletal system and connective tissue
    M00–M99
    • Disorders of bone density and structure
      M80-M85
      • Other disorders of bone density and structure
        M85

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.


Type 1 Excludes

Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • osteogenesis imperfecta Q78.0
  • osteopetrosis Q78.2
  • osteopoikilosis Q78.8
  • polyostotic fibrous dysplasia Q78.1

Patient Education


Bone Density

What is 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. They tend to be stronger and less likely to fracture (break).

Losing bone density can weaken your bones. In some cases, it can lead to osteoporosis. This is a disease which can make your bones more likely to break. Low bone density that is not low enough to be osteoporosis is sometimes called osteopenia.

What can make you lose bone density?

Your bones become less dense as you age. Other factors can also make you more likely to lose bone mass, such as:

  • A family history of osteoporosis or low bone mass
  • Not developing good bone mass when you are young
  • Having certain medical conditions, such as:
    • Endocrine diseases
    • Certain digestive diseases
    • Rheumatoid arthritis
    • Certain types of cancer
    • HIV
    • Anorexia nervosa, a type of eating disorder
  • Taking certain medicines, such as:
    • Corticosteroids
    • Proton pump inhibitors (which treat GERD)
    • Medicines to treat epilepsy
  • Smoking tobacco
  • Long-term heavy alcohol use
  • Physical inactivity or prolonged periods of bedrest

Not everyone who has low bone mass gets osteoporosis, but they are at higher risk for developing it.

Is there a test to measure your bone health?

A bone density scan is the best way to measure your bone health. It compares your bone density, or mass, to that of a healthy person who is the same age and sex as you are. It can show:

  • Whether you have low bone density
  • Whether you have osteoporosis, a disease that makes your bones weak
  • Your risk for breaking bones
  • Whether your osteoporosis treatment is working

How can I keep my bones strong?

To help keep your bones strong and help prevent osteoporosis, the best thing to do is to eat a healthy diet rich in calcium and vitamin D. Getting regular physical activity, limiting alcohol, and not smoking can also help. In some cases, your health care provider may prescribe medicines to prevent osteoporosis.

NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases


[Learn More in MedlinePlus]

Bone Diseases

Your bones help you move, give you shape and support your body. They are living tissues that rebuild constantly throughout your life. During childhood and your teens, your body adds new bone faster than it removes old bone. After about age 20, you can lose bone faster than you make bone. To have strong bones when you are young, and to prevent bone loss when you are older, you need to get enough calcium, vitamin D, and exercise. You should also avoid smoking and drinking too much alcohol.

Bone diseases can make bones easy to break. Different kinds of bone problems include:

  • Low bone density and osteoporosis, which make your bones weak and more likely to break
  • Osteogenesis imperfecta makes your bones brittle
  • Paget's disease of bone makes them weak
  • Bones can also develop cancer and infections
  • Other bone diseases, which are caused by poor nutrition, genetics, or problems with the rate of bone growth or rebuilding

NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases


[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.