M85 — Other disorders of bone density and structure
Not billable
Is M85 billable?
No — M85 is a non-billable header code. M85 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 60 billable codes beneath M85.
Billable codes under this header
- M85.2Hyperostosis of skull
- M85.9Disorder of bone density and structure, unspecified
- M85.00Fibrous dysplasia (monostotic), unspecified site
- M85.08Fibrous dysplasia (monostotic), other site
- M85.09Fibrous dysplasia (monostotic), multiple sites
- M85.10Skeletal fluorosis, unspecified site
- M85.18Skeletal fluorosis, other site
- M85.19Skeletal fluorosis, multiple sites
- M85.30Osteitis condensans, unspecified site
- M85.38Osteitis condensans, other site
- M85.39Osteitis condensans, multiple sites
- M85.40Solitary bone cyst, unspecified site
- M85.48Solitary bone cyst, other site
- M85.50Aneurysmal bone cyst, unspecified site
- M85.58Aneurysmal bone cyst, other site
- M85.59Aneurysmal bone cyst, multiple sites
- M85.60Other cyst of bone, unspecified site
- M85.68Other cyst of bone, other site
- M85.69Other cyst of bone, multiple sites
- M85.80Other specified disorders of bone density and structure, unspecified site
- M85.88Other specified disorders of bone density and structure, other site
- M85.89Other specified disorders of bone density and structure, multiple sites
- M85.011Fibrous dysplasia (monostotic), right shoulder
- M85.012Fibrous dysplasia (monostotic), left shoulder
- M85.019Fibrous dysplasia (monostotic), unspecified shoulder
- M85.021Fibrous dysplasia (monostotic), right upper arm
- M85.022Fibrous dysplasia (monostotic), left upper arm
- M85.029Fibrous dysplasia (monostotic), unspecified upper arm
- M85.031Fibrous dysplasia (monostotic), right forearm
- M85.032Fibrous dysplasia (monostotic), left forearm
- M85.039Fibrous dysplasia (monostotic), unspecified forearm
- M85.041Fibrous dysplasia (monostotic), right hand
- M85.042Fibrous dysplasia (monostotic), left hand
- M85.049Fibrous dysplasia (monostotic), unspecified hand
- M85.051Fibrous dysplasia (monostotic), right thigh
- M85.052Fibrous dysplasia (monostotic), left thigh
- M85.059Fibrous dysplasia (monostotic), unspecified thigh
- M85.061Fibrous dysplasia (monostotic), right lower leg
- M85.062Fibrous dysplasia (monostotic), left lower leg
- M85.069Fibrous dysplasia (monostotic), unspecified lower leg
- M85.071Fibrous dysplasia (monostotic), right ankle and foot
- M85.072Fibrous dysplasia (monostotic), left ankle and foot
- M85.079Fibrous dysplasia (monostotic), unspecified ankle and foot
- M85.111Skeletal fluorosis, right shoulder
- M85.112Skeletal fluorosis, left shoulder
- M85.119Skeletal fluorosis, unspecified shoulder
- M85.121Skeletal fluorosis, right upper arm
- M85.122Skeletal fluorosis, left upper arm
- M85.129Skeletal fluorosis, unspecified upper arm
- M85.131Skeletal fluorosis, right forearm
- M85.132Skeletal fluorosis, left forearm
- M85.139Skeletal fluorosis, unspecified forearm
- M85.141Skeletal fluorosis, right hand
- M85.142Skeletal fluorosis, left hand
- M85.149Skeletal fluorosis, unspecified hand
- M85.151Skeletal fluorosis, right thigh
- M85.152Skeletal fluorosis, left thigh
- M85.159Skeletal fluorosis, unspecified thigh
- M85.161Skeletal fluorosis, right lower leg
- M85.162Skeletal fluorosis, left lower leg
M85 at a glance
| Code | M85 |
|---|---|
| Description | Other disorders of bone density and structure |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes1 — never code together
The conditions below can never be reported together with M85 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Excludes2 — not included here — inherited from Chapter 13
The conditions below are not part of M85, but a patient may have both at the same time. When documentation supports it, M85 and the excluded code may both be reported.
- arthropathic psoriasis (L40.5-)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- compartment syndrome (traumatic) (T79.A-)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
What codes fall under M85? (9)
- M85.0Fibrous dysplasia (monostotic)not billable
- M85.1Skeletal fluorosisnot billable
- M85.2Hyperostosis of skull
- M85.3Osteitis condensansnot billable
- M85.4Solitary bone cystnot billable
- M85.5Aneurysmal bone cystnot billable
- M85.6Other cyst of bonenot billable
- M85.8Other specified disorders of bone density and structurenot billable
- M85.9Disorder of bone density and structure, unspecified
How long has M85 existed?
M85 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with M85?
ICD-10-CM declares these codes mutually exclusive with M85 — exactly one of each pair can be correct for a given encounter.