M85
Non-Billable

Other disorders of bone density and structure

Non-Billable / Non-Specific Code

What is Other disorders of bone density and structure?

ICD-10-CM M85 is the diagnosis code for Other disorders of bone density and structure. This code falls under the section "Disorders of bone density and structure" within Chapter 13 — Diseases of the musculoskeletal system and connective tissue (M00-M99). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.

⛔ Excludes1

Coding Guidelines for M85

⛔ Type 1 Excludes (Never code together)

The following conditions should never be coded at the same time as M85. They are mutually exclusive:

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

ICD-10-CM Code Hierarchy

Understanding where M85 sits in the ICD-10-CM classification helps ensure proper coding:

Sub-Codes 9 entries
M85.0Fibrous dysplasia (monostotic)Non-BillableM85.00Fibrous dysplasia (monostotic), unspecified siteBillableM85.01Fibrous dysplasia (monostotic), shoulderNon-BillableM85.011Fibrous dysplasia (monostotic), right shoulderBillableM85.012Fibrous dysplasia (monostotic), left shoulderBillableM85.019Fibrous dysplasia (monostotic), unspecified shoulderBillableM85.02Fibrous dysplasia (monostotic), upper armNon-BillableM85.021Fibrous dysplasia (monostotic), right upper armBillableM85.022Fibrous dysplasia (monostotic), left upper armBillableM85.029Fibrous dysplasia (monostotic), unspecified upper armBillableM85.03Fibrous dysplasia (monostotic), forearmNon-BillableM85.031Fibrous dysplasia (monostotic), right forearmBillableM85.032Fibrous dysplasia (monostotic), left forearmBillableM85.039Fibrous dysplasia (monostotic), unspecified forearmBillableM85.04Fibrous dysplasia (monostotic), handNon-BillableM85.041Fibrous dysplasia (monostotic), right handBillableM85.042Fibrous dysplasia (monostotic), left handBillableM85.049Fibrous dysplasia (monostotic), unspecified handBillableM85.05Fibrous dysplasia (monostotic), thighNon-BillableM85.051Fibrous dysplasia (monostotic), right thighBillableM85.052Fibrous dysplasia (monostotic), left thighBillableM85.059Fibrous dysplasia (monostotic), unspecified thighBillableM85.06Fibrous dysplasia (monostotic), lower legNon-BillableM85.061Fibrous dysplasia (monostotic), right lower legBillableM85.062Fibrous dysplasia (monostotic), left lower legBillableM85.069Fibrous dysplasia (monostotic), unspecified lower legBillableM85.07Fibrous dysplasia (monostotic), ankle and footNon-BillableM85.071Fibrous dysplasia (monostotic), right ankle and footBillableM85.072Fibrous dysplasia (monostotic), left ankle and footBillableM85.079Fibrous dysplasia (monostotic), unspecified ankle and footBillableM85.08Fibrous dysplasia (monostotic), other siteBillableM85.09Fibrous dysplasia (monostotic), multiple sitesBillableM85.1Skeletal fluorosisNon-BillableM85.10Skeletal fluorosis, unspecified siteBillableM85.11Skeletal fluorosis, shoulderNon-BillableM85.111Skeletal fluorosis, right shoulderBillableM85.112Skeletal fluorosis, left shoulderBillableM85.119Skeletal fluorosis, unspecified shoulderBillableM85.12Skeletal fluorosis, upper armNon-BillableM85.121Skeletal fluorosis, right upper armBillableM85.122Skeletal fluorosis, left upper armBillableM85.129Skeletal fluorosis, unspecified upper armBillableM85.13Skeletal fluorosis, forearmNon-BillableM85.131Skeletal fluorosis, right forearmBillableM85.132Skeletal fluorosis, left forearmBillableM85.139Skeletal fluorosis, unspecified forearmBillableM85.14Skeletal fluorosis, handNon-BillableM85.141Skeletal fluorosis, right handBillableM85.142Skeletal fluorosis, left handBillableM85.149Skeletal fluorosis, unspecified handBillableM85.15Skeletal fluorosis, thighNon-BillableM85.151Skeletal fluorosis, right thighBillableM85.152Skeletal fluorosis, left thighBillableM85.159Skeletal fluorosis, unspecified thighBillableM85.16Skeletal fluorosis, lower legNon-BillableM85.161Skeletal fluorosis, right lower legBillableM85.162Skeletal fluorosis, left lower legBillableM85.169Skeletal fluorosis, unspecified lower legBillableM85.17Skeletal fluorosis, ankle and footNon-BillableM85.171Skeletal fluorosis, right ankle and footBillableM85.172Skeletal fluorosis, left ankle and footBillableM85.179Skeletal fluorosis, unspecified ankle and footBillableM85.18Skeletal fluorosis, other siteBillableM85.19Skeletal fluorosis, multiple sitesBillableM85.2Hyperostosis of skullBillableM85.3Osteitis condensansNon-BillableM85.30Osteitis condensans, unspecified siteBillableM85.31Osteitis condensans, shoulderNon-BillableM85.311Osteitis condensans, right shoulderBillableM85.312Osteitis condensans, left shoulderBillableM85.319Osteitis condensans, unspecified shoulderBillableM85.32Osteitis condensans, upper armNon-BillableM85.321Osteitis condensans, right upper armBillableM85.322Osteitis condensans, left upper armBillableM85.329Osteitis condensans, unspecified upper armBillableM85.33Osteitis condensans, forearmNon-BillableM85.331Osteitis condensans, right forearmBillableM85.332Osteitis condensans, left forearmBillableM85.339Osteitis condensans, unspecified forearmBillableM85.34Osteitis condensans, handNon-BillableM85.341Osteitis condensans, right handBillableM85.342Osteitis condensans, left handBillableM85.349Osteitis condensans, unspecified handBillableM85.35Osteitis condensans, thighNon-BillableM85.351Osteitis condensans, right thighBillableM85.352Osteitis condensans, left thighBillableM85.359Osteitis condensans, unspecified thighBillableM85.36Osteitis condensans, lower legNon-BillableM85.361Osteitis condensans, right lower legBillableM85.362Osteitis condensans, left lower legBillableM85.369Osteitis condensans, unspecified lower legBillableM85.37Osteitis condensans, ankle and footNon-BillableM85.371Osteitis condensans, right ankle and footBillableM85.372Osteitis condensans, left ankle and footBillableM85.379Osteitis condensans, unspecified ankle and footBillableM85.38Osteitis condensans, other siteBillableM85.39Osteitis condensans, multiple sitesBillableM85.4Solitary bone cystNon-BillableM85.40Solitary bone cyst, unspecified siteBillableM85.41Solitary bone cyst, shoulderNon-BillableM85.411Solitary bone cyst, right shoulderBillableM85.412Solitary bone cyst, left shoulderBillableM85.419Solitary bone cyst, unspecified shoulderBillableM85.42Solitary bone cyst, humerusNon-BillableM85.421Solitary bone cyst, right humerusBillableM85.422Solitary bone cyst, left humerusBillableM85.429Solitary bone cyst, unspecified humerusBillableM85.43Solitary bone cyst, ulna and radiusNon-BillableM85.431Solitary bone cyst, right ulna and radiusBillableM85.432Solitary bone cyst, left ulna and radiusBillableM85.439Solitary bone cyst, unspecified ulna and radiusBillableM85.44Solitary bone cyst, handNon-BillableM85.441Solitary bone cyst, right handBillableM85.442Solitary bone cyst, left handBillableM85.449Solitary bone cyst, unspecified handBillableM85.45Solitary bone cyst, pelvisNon-BillableM85.451Solitary bone cyst, right pelvisBillableM85.452Solitary bone cyst, left pelvisBillableM85.459Solitary bone cyst, unspecified pelvisBillableM85.46Solitary bone cyst, tibia and fibulaNon-BillableM85.461Solitary bone cyst, right tibia and fibulaBillableM85.462Solitary bone cyst, left tibia and fibulaBillableM85.469Solitary bone cyst, unspecified tibia and fibulaBillableM85.47Solitary bone cyst, ankle and footNon-BillableM85.471Solitary bone cyst, right ankle and footBillableM85.472Solitary bone cyst, left ankle and footBillableM85.479Solitary bone cyst, unspecified ankle and footBillableM85.48Solitary bone cyst, other siteBillableM85.5Aneurysmal bone cystNon-BillableM85.50Aneurysmal bone cyst, unspecified siteBillableM85.51Aneurysmal bone cyst, shoulderNon-BillableM85.511Aneurysmal bone cyst, right shoulderBillableM85.512Aneurysmal bone cyst, left shoulderBillableM85.519Aneurysmal bone cyst, unspecified shoulderBillableM85.52Aneurysmal bone cyst, upper armNon-BillableM85.521Aneurysmal bone cyst, right upper armBillableM85.522Aneurysmal bone cyst, left upper armBillableM85.529Aneurysmal bone cyst, unspecified upper armBillableM85.53Aneurysmal bone cyst, forearmNon-BillableM85.531Aneurysmal bone cyst, right forearmBillableM85.532Aneurysmal bone cyst, left forearmBillableM85.539Aneurysmal bone cyst, unspecified forearmBillableM85.54Aneurysmal bone cyst, handNon-BillableM85.541Aneurysmal bone cyst, right handBillableM85.542Aneurysmal bone cyst, left handBillableM85.549Aneurysmal bone cyst, unspecified handBillableM85.55Aneurysmal bone cyst, thighNon-BillableM85.551Aneurysmal bone cyst, right thighBillableM85.552Aneurysmal bone cyst, left thighBillableM85.559Aneurysmal bone cyst, unspecified thighBillableM85.56Aneurysmal bone cyst, lower legNon-BillableM85.561Aneurysmal bone cyst, right lower legBillableM85.562Aneurysmal bone cyst, left lower legBillableM85.569Aneurysmal bone cyst, unspecified lower legBillableM85.57Aneurysmal bone cyst, ankle and footNon-BillableM85.571Aneurysmal bone cyst, right ankle and footBillableM85.572Aneurysmal bone cyst, left ankle and footBillableM85.579Aneurysmal bone cyst, unspecified ankle and footBillableM85.58Aneurysmal bone cyst, other siteBillableM85.59Aneurysmal bone cyst, multiple sitesBillableM85.6Other cyst of boneNon-BillableM85.60Other cyst of bone, unspecified siteBillableM85.61Other cyst of bone, shoulderNon-BillableM85.611Other cyst of bone, right shoulderBillableM85.612Other cyst of bone, left shoulderBillableM85.619Other cyst of bone, unspecified shoulderBillableM85.62Other cyst of bone, upper armNon-BillableM85.621Other cyst of bone, right upper armBillableM85.622Other cyst of bone, left upper armBillableM85.629Other cyst of bone, unspecified upper armBillableM85.63Other cyst of bone, forearmNon-BillableM85.631Other cyst of bone, right forearmBillableM85.632Other cyst of bone, left forearmBillableM85.639Other cyst of bone, unspecified forearmBillableM85.64Other cyst of bone, handNon-BillableM85.641Other cyst of bone, right handBillableM85.642Other cyst of bone, left handBillableM85.649Other cyst of bone, unspecified handBillableM85.65Other cyst of bone, thighNon-BillableM85.651Other cyst of bone, right thighBillableM85.652Other cyst of bone, left thighBillableM85.659Other cyst of bone, unspecified thighBillableM85.66Other cyst of bone, lower legNon-BillableM85.661Other cyst of bone, right lower legBillableM85.662Other cyst of bone, left lower legBillableM85.669Other cyst of bone, unspecified lower legBillableM85.67Other cyst of bone, ankle and footNon-BillableM85.671Other cyst of bone, right ankle and footBillableM85.672Other cyst of bone, left ankle and footBillableM85.679Other cyst of bone, unspecified ankle and footBillableM85.68Other cyst of bone, other siteBillableM85.69Other cyst of bone, multiple sitesBillableM85.8Other specified disorders of bone density and structureNon-BillableM85.80Other specified disorders of bone density and structure, unspecified siteBillableM85.81Other specified disorders of bone density and structure, shoulderNon-BillableM85.811Other specified disorders of bone density and structure, right shoulderBillableM85.812Other specified disorders of bone density and structure, left shoulderBillableM85.819Other specified disorders of bone density and structure, unspecified shoulderBillableM85.82Other specified disorders of bone density and structure, upper armNon-BillableM85.821Other specified disorders of bone density and structure, right upper armBillableM85.822Other specified disorders of bone density and structure, left upper armBillableM85.829Other specified disorders of bone density and structure, unspecified upper armBillableM85.83Other specified disorders of bone density and structure, forearmNon-BillableM85.831Other specified disorders of bone density and structure, right forearmBillableM85.832Other specified disorders of bone density and structure, left forearmBillableM85.839Other specified disorders of bone density and structure, unspecified forearmBillableM85.84Other specified disorders of bone density and structure, handNon-BillableM85.841Other specified disorders of bone density and structure, right handBillableM85.842Other specified disorders of bone density and structure, left handBillableM85.849Other specified disorders of bone density and structure, unspecified handBillableM85.85Other specified disorders of bone density and structure, thighNon-BillableM85.851Other specified disorders of bone density and structure, right thighBillableM85.852Other specified disorders of bone density and structure, left thighBillableM85.859Other specified disorders of bone density and structure, unspecified thighBillableM85.86Other specified disorders of bone density and structure, lower legNon-BillableM85.861Other specified disorders of bone density and structure, right lower legBillableM85.862Other specified disorders of bone density and structure, left lower legBillableM85.869Other specified disorders of bone density and structure, unspecified lower legBillableM85.87Other specified disorders of bone density and structure, ankle and footNon-BillableM85.871Other specified disorders of bone density and structure, right ankle and footBillableM85.872Other specified disorders of bone density and structure, left ankle and footBillableM85.879Other specified disorders of bone density and structure, unspecified ankle and footBillableM85.88Other specified disorders of bone density and structure, other siteBillableM85.89Other specified disorders of bone density and structure, multiple sitesBillableM85.9Disorder of bone density and structure, unspecifiedBillable
Related Codes

Frequently Asked Questions

Is M85 a billable ICD-10-CM code?

No, M85 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.

What does M85 mean?

M85 is the ICD-10-CM diagnosis code for "Other disorders of bone density and structure". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.

What section is M85 in?

M85 is located in Section M80-M85 — "Disorders of bone density and structure" within Chapter 13 of the ICD-10-CM Tabular List.

What are the sub-codes of M85?

M85 has 9 sub-code(s) that provide more specific detail: M85.0, M85.1, M85.2, M85.3, M85.4 and more.

When should I use M85?

Use M85 when the patients documented diagnosis matches "Other disorders of bone density and structure" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.

People Also Ask

What is the ICD-10 code for Other disorders of bone density and structure?

The ICD-10-CM code for Other disorders of bone density and structure is M85.

Can M85 be used for primary diagnosis?

No, M85 is non-billable. Use a more specific sub-code for primary diagnosis billing.

What chapter is M85 in?

M85 is in Chapter 13 of the ICD-10-CM Tabular List.

What conditions are excluded from M85?

Type 1 Excludes for M85 include: osteogenesis imperfecta (Q78.0); osteopetrosis (Q78.2); osteopoikilosis (Q78.8) and more.

Is M85 valid for 2026?

Yes, M85 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.

See Also

← PreviousM84.9Disorder of continuity of bone, unspecifiedNext →M85.0Fibrous dysplasia (monostotic)
Code Details
M85
Other disorders of bone density and structure
Non-Billable / Non-Specific Code
13 — Diseases of the musculoskeletal system and connective tissue (M00-M99)
M80-M85 — Disorders of bone density and structure
2026 ICD-10-CM