2026 ICD-10-CM Diagnosis Code M90.632Osteitis deformans in neoplastic diseases, left forearm

ICD-10-CM Codes›M00–M99›M86-M90›M90

ICD-10-CM M90.632
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M90.632 is a billable ICD-10-CM diagnosis code for osteitis deformans in neoplastic diseases, left forearm. 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 a manifestation code that cannot be reported as the principal diagnosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified bone disease and musculoskeletal deformities.

Code Identity

ICD-10-CM Code
M90.632
Billable Status
Yes — Valid for Submission
Code Describes
Osteitis deformans in neoplastic diseases, left forearm
Short Description
Osteitis deformans in neoplastic diseases, left forearm
Same as the full description in the CMS dataset.
Parent Code
M90.63
Osteitis deformans in neoplastic diseases, forearm

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM86-M90Other osteopathies
CategoryM90Osteopathies in diseases classified elsewhere
This CodeM90.632Osteitis deformans in neoplastic diseases, left forearm

Code EditsBilling

Medicare Code Editor checks that affect claim validity for M90.632.

Manifestation diagnoses
Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and therefore should not be used as a principal diagnosis.

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 No · outpatient No

Patient EducationClinical

Paget's Disease of Bone

Paget's disease of bone is a chronic bone disorder. Normally, there is a process in which your bones break down and then regrow. In Paget's disease, this process is abnormal. There is excessive breakdown and regrowth of bone. Because the bones regrow too quickly, they are bigger and softer than normal.

The full article covers:

  • What is Paget's disease of bone?
  • What causes Paget's disease of bone?
  • Who is at risk for Paget's disease of bone?
  • What are the symptoms of Paget's disease of bone?
  • What other problems can Paget's disease of bone cause?
  • How is Paget's disease of bone diagnosed?
  • What are the treatments for Paget's disease of bone?

Read the full article at MedlinePlus

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

Convert M90.632 to ICD-9-CMHistory

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

ICD-9-CM
731.1 Osteitis def in oth dis
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 M90.632Overview

Is M90.632 (Osteitis deformans in neoplastic diseases, forearm) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report osteitis deformans in neoplastic diseases, left forearm on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M90.632 group to?

On inpatient claims, osteitis deformans in neoplastic diseases, left forearm maps to MS-DRG 553, 554, with relative weights from 0.8301 to 1.2963 depending on complications. Higher weights mean higher Medicare reimbursement.

Can M90.632 be a principal diagnosis?

No. This is a manifestation code: osteitis deformans in neoplastic diseases, left forearm describes the manifestation of an underlying disease rather than the disease itself, so the underlying condition is sequenced first.

What is the ICD-9 equivalent of M90.632?

Under the General Equivalence Mappings, osteitis deformans in neoplastic diseases, left forearm converts to ICD-9-CM 731.1 (osteitis def in oth dis). 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.