2026 ICD-10-CM Diagnosis Code M83.9Adult osteomalacia, unspecified

ICD-10-CM Codes›M00–M99›M80-M85›M83

ICD-10-CM M83.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M83.9 is a billable ICD-10-CM diagnosis code for adult osteomalacia, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 553 through 554. The code is restricted by the Medicare Code Editor to adult patients (age 15 through 124). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Osteomalacia and Other specified bone disease and musculoskeletal deformities.

Code Identity

ICD-10-CM Code
M83.9
Billable Status
Yes — Valid for Submission
Code Describes
Adult osteomalacia, unspecified
Short Description
Adult osteomalacia, unspecified
Same as the full description in the CMS dataset.
Parent Code
M83
Adult osteomalacia

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM80-M85Disorders of bone density and structure
CategoryM83Adult osteomalacia
This CodeM83.9Adult osteomalacia, unspecified

Code EditsBilling

Medicare Code Editor checks that affect claim validity for M83.9.

Adult diagnoses
The Medicare Code Editor detects inconsistencies in adult cases by checking a patient's age and any diagnosis on the patient's record. The adult code edits apply to patients age range is 15–124 years inclusive (e.g., senile delirium, mature cataract).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acquired deformity of chest wall
  • Acquired deformity of rib
  • Active rickets
  • Calcipenic type rickets
  • Curvature of spine due to osteomalacia
  • Endocrine myopathy
  • Myopathy in osteomalacia
  • Osteomalacia
  • Rachitic rosary
  • Rickets

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.

    • Malacia, bone(adult)
    • Osteomalacia
    • Osteomalacia
      • adult

Clinical ClassificationClinical

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

CCSR MUS035
Osteomalacia
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR MUS028
Other specified bone disease and musculoskeletal deformities
Default principal diagnosis: inpatient No · outpatient No

Clinical InformationClinical

  • Chronic Kidney Disease-Mineral and Bone Disorder

    decalcification of bone or abnormal bone development due to chronic kidney diseases, in which 1,25-dihydroxyvitamin d3 synthesis by the kidneys is impaired, leading to reduced negative feedback on parathyroid hormone. the resulting secondary hyperparathyroidism eventually leads to bone disorders.

  • Familial Hypophosphatemic Rickets

    a hereditary disorder characterized by hypophosphatemia; rickets; osteomalacia; renal defects in phosphate reabsorption and vitamin d metabolism; and growth retardation. autosomal and x-linked dominant and recessive variants have been reported.

  • Osteomalacia

    disorder caused by an interruption of the mineralization of organic bone matrix leading to bone softening, bone pain, and weakness. it is the adult form of rickets resulting from disruption of vitamin d; phosphorus; or calcium homeostasis.

  • Rickets

    disorders caused by interruption of bone mineralization manifesting as osteomalacia in adults and characteristic deformities in infancy and childhood due to disturbances in normal bone formation. the mineralization process may be interrupted by disruption of vitamin d; phosphorus; or calcium homeostasis, resulting from dietary deficiencies, or acquired, or inherited metabolic, or hormonal disturbances.

  • Rickets, Hypophosphatemic

    a disorder characterized by hypophosphatemia; rickets; osteomalacia; resulting from lack of phosphate reabsorption by the kidneys and possible defects in vitamin d metabolism.

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 M83.9 to ICD-9-CMHistory

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

ICD-9-CM
268.2 Osteomalacia 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 M83.9Overview

Is M83.9 (Adult osteomalacia) a billable code?

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

What MS-DRG does M83.9 group to?

When adult osteomalacia, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 553, 554, with relative weights from 0.8301 to 1.2963 depending on complications. Higher weights mean higher Medicare reimbursement.

Who can M83.9 be reported for?

The Medicare Code Editor checks adult osteomalacia, unspecified against patient demographics: this code is intended for adult patients (age 15 through 124). Claims outside these limits are flagged as inconsistent.

What is the ICD-9 equivalent of M83.9?

Under the General Equivalence Mappings, adult osteomalacia, unspecified converts to ICD-9-CM 268.2 (osteomalacia NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.