2026 ICD-10-CM Diagnosis Code M89.9Disorder of bone, unspecified

ICD-10-CM Codes›M00–M99›M86-M90›M89

ICD-10-CM M89.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M89.9 is a billable ICD-10-CM diagnosis code for disorder of bone, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 564 through 566. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified bone disease and musculoskeletal deformities.

Code Identity

ICD-10-CM Code
M89.9
Billable Status
Yes — Valid for Submission
Code Describes
Disorder of bone, unspecified
Short Description
Disorder of bone, unspecified
Same as the full description in the CMS dataset.
Parent Code
M89
Other disorders of bone

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM86-M90Other osteopathies
CategoryM89Other disorders of bone
This CodeM89.9Disorder of bone, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute disease of bone
  • Bilateral orbital deformity
  • Bilateral orbital deformity due to bone disease
  • Bone AND/OR joint disorder in mother complicating pregnancy, childbirth AND/OR puerperium
  • Bone AND/OR joint disorder of back in mother complicating pregnancy, childbirth AND/OR puerperium
  • Bone AND/OR joint disorder of lower extremities in mother complicating pregnancy, childbirth AND/OR puerperium
  • Bone AND/OR joint disorder of pelvis in mother complicating pregnancy, childbirth AND/OR puerperium
  • Chronic musculoskeletal pain due to disorder
  • Chronic musculoskeletal pain due to disorder of bone
  • Disorder of bone
  • Disorder of bone and articular cartilage
  • Disorder of bone caused by ionizing radiation
  • Disorder of epiphysis
  • Disorder of ethmoid bone
  • Disorder of facial bone
  • Disorder of hyoid bone
  • Disorder of ilium
  • Disorder of lacrimal bone
  • Disorder of nasal bone
  • Disorder of palatine bone
  • Disorder of pelvic girdle
  • Disorder of sesamoid bone of foot
  • Disorder of skeletal system
  • Disorder of skull
  • Disorder of zygomatic bone
  • Exostosis
  • Left orbital deformity
  • Left orbital deformity due to bone disease
  • Lesion of bone
  • Lesion of left parietal bone
  • Lesion of right parietal bone
  • Lesioned component
  • Orbital deformity due to bone disease
  • Perinatal skull defect
  • Postinfectious osteopathy
  • Pubic bone dysfunction
  • Right orbital deformity
  • Right orbital deformity due to bone disease
  • Solitary exostosis
  • Somatic dysfunction of innominate bone
  • Somatic dysfunction of pubic bone

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Defect, defective
      • osseous, major
        • multiple sites
    • Disorder(of)
      • bone

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MUS028
Other specified bone disease and musculoskeletal deformities
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Childhood Subungual Exostosis|Pediatric Subungual Exostosis

    subungual exostosis that occurs during childhood.

  • Exostosin-Like 1|EC 2.4.1.224|EXTL1|Exostosin-L|Exostosin-Like 1 Protein|Glucuronosyl-N-Acetylglucosaminyl-Proteoglycan 4-Alpha-N-Acetylglucosaminyltransferase|Multiple Exostosis-Like Protein

    exostosin-like 1 (676 aa, ~75 kda) is encoded by the human extl1 gene. this protein is involved in protein glycosylation.

  • Exostosin-Like 3|EC 2.4.1.223|EXT-Related Protein 1|EXTL3|Exostosin-Like 3 Protein|Glucuronyl-Galactosyl-Proteoglycan 4-Alpha-N-Acetylglucosaminyltransferase|Hereditary Multiple Exostoses Gene Isolog|Multiple Exostosis-Like Protein 3|Putative Tumor Suppressor Protein EXTL3

    exostosin-like 3 (919, ~105 kda) is encoded by the human extl3 gene. this protein is involved in protein glycosylation and the unfolded protein response.

  • Exostosis

    non-neoplastic overgrowth of bone.

  • Exostosis, CTCAE 5.0|Exostosis|Exostosis

    a disorder characterized by non-neoplastic overgrowth of bone.

  • EXT1 Gene Mutation|EXT Gene Mutation|Exostosin 1 Gene Mutation|Exostosin Glycosyltransferase 1 Gene Mutation|Multiple Exostosis 1 Gene Mutation|TRPS2 Gene Mutation|TTV Gene Mutation

    a change in the nucleotide sequence of the ext1 gene.

  • EXT2 Gene Mutation|Exostosin Glycosyltransferase 2 Gene Mutation|Multiple Exostosis 2 Gene Mutation

    a change in the nucleotide sequence of the ext2 gene.

  • EXT2 wt Allele|Exostoses (Multiple) 2 Gene|Exostosin Glycosyltransferase 2 wt Allele|Multiple Exostosis 2 Gene|SOTV|SSMS

    human ext2 wild-type allele is located within 11p12-p11 and is approximately 150 kb in length. this allele, which encodes exostosin-2 protein, plays a role in the chain elongation step of heparin sulfate biosynthesis. certain allelic variants of the ext2 gene cause multiple exostoses type ii.

  • Grade 1 Exostosis, CTCAE|Grade 1 Exostosis|Grade 1 Exostosis

    asymptomatic; clinical or diagnostic observations only; intervention not indicated

  • Grade 2 Exostosis, CTCAE|Grade 2 Exostosis|Grade 2 Exostosis

    symptomatic; limiting instrumental adl

  • Grade 3 Exostosis, CTCAE|Grade 3 Exostosis|Grade 3 Exostosis

    severe symptoms; limiting self care adl; elective operative intervention indicated

  • Ivory Exostosis

    an osteoma that develops on the surface of the bone.

  • Osteochondroma|OSTEOCHONDROMA, BENIGN|Osteocartilaginous Exostosis|Osteocartilaginous exostosis

    a common, benign cartiliginous neoplasm arising from the metaphysis of bone. the tumor grows on the surface of the bone; it may be pedunculated or sessile. it is characterized by the presence of chondrocytes, a cartilage cap, and a fibrous perichondrium that extends to the periosteum of the bone. in some cases, there is deletion of 8q24.1 chromosome locus.

  • Subungual Exostosis|Dupuytren Exostosis

    a benign tumor that affects the distal phalanx, most often the great toe. grossly it consists of a cartilage cap and a bony stalk. microscopically it is characterized by an osteochondromatous proliferation with a gradual transition of a peripheral spindle-cell proliferation to hyaline cartilage to trabecular bone. pain and swelling are present. simple resection is usually curative.

Patient EducationClinical

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.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert M89.9 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
733.90 Bone & cartilage dis NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About M89.9Overview

Is M89.9 (Other disorders of bone) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report disorder of bone, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M89.9 group to?

When disorder of bone, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 564, 565, 566, with relative weights from 0.7493 to 1.5436 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M89.9?

Under the General Equivalence Mappings, disorder of bone, unspecified converts to ICD-9-CM 733.90 (bone & cartilage dis NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.