M85.8 — Other specified disorders of bone density and structure

Not billable

Is M85.8 billable?

No — M85.8 is a non-billable header code. M85.8 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 24 billable codes beneath M85.8.

Billable codes under this header

M85.8 at a glance

Code	M85.8
Description	Other specified 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

How is M85.8 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to M85.8. They show the wording a clinician may have documented, which often differs from the Tabular description.

Osteopenia
Borderline › osteopenia
Osteopenia › borderline
Osteosclerosis › acquired
Disorder › bone › density and structure › specified type NEC (of)

Excludes1 — never code together

The conditions below can never be reported together with M85.8 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

diffuse idiopathic skeletal hyperostosis [DISH] (M48.1)
osteosclerosis congenita (Q77.4)
osteosclerosis fragilitas (generalista) (Q78.2)
osteosclerosis myelofibrosis (D75.81)

Inclusion terms

Alternative wording in documentation that is classified to M85.8.

Hyperostosis of bones, except skull
Osteosclerosis, acquired

Excludes1 — never code together — inherited from M85

The conditions below can never be reported together with M85.8 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

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

Excludes2 — not included here — inherited from Chapter 13

The conditions below are not part of M85.8, but a patient may have both at the same time. When documentation supports it, M85.8 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 M85.8? (10)

How long has M85.8 existed?

M85.8 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 M85.8?

ICD-10-CM declares these codes mutually exclusive with M85.8 — exactly one of each pair can be correct for a given encounter.

Which conditions are coded to M85.8?

ICD-10 code for Osteosclerosis