All ICD10 Codes

M85

Non-Billable
ChapterM00–M99
Rankcategory
Official Description

Other disorders of bone density and structure

Use a more specific code (2 billable, 7 non-billable)
M85.0Fibrous dysplasia (monostotic)has subcodesM85.1Skeletal fluorosishas subcodesM85.2Hyperostosis of skullM85.3Osteitis condensanshas subcodesM85.4Solitary bone cysthas subcodesM85.5Aneurysmal bone cysthas subcodesM85.6Other cyst of bonehas subcodesM85.8Other specified disorders of bone density and structurehas subcodesM85.9Disorder of bone density and structure, unspecified
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue (M00-M99).

CH13 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • 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)

Instructional Notes

Excludes1(Not coded here. Use a different code.)
  • osteogenesis imperfecta (Q78.0)
  • osteopetrosis (Q78.2)
  • osteopoikilosis (Q78.8)
  • polyostotic fibrous dysplasia (Q78.1)

Clinical Hierarchy

BillableHas subcodes
CH13Diseases of the musculoskeletal system and connective tissue (M00-M99)
M80-M85Disorders of bone density and structure (M80-M85)
M85Other disorders of bone density and structureNot billable
M85.0Fibrous dysplasia (monostotic)Subcodes
M85.1Skeletal fluorosisSubcodes
M85.2Hyperostosis of skullBillable
M85.3Osteitis condensansSubcodes
M85.4Solitary bone cystSubcodes
M85.5Aneurysmal bone cystSubcodes
M85.6Other cyst of boneSubcodes
M85.8Other specified disorders of bone density and structureSubcodes
M85.9Disorder of bone density and structure, unspecifiedBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to M85:

chapterCH13
Diseases of the musculoskeletal system and connective tissue (M00-M99)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

Find Procedures (ICD-10-PCS)

Find surgical and procedural codes related to Other disorders of bone density and structure.

Search PCS Codes