2026 ICD-10-CM Diagnosis Code M88Osteitis deformans [Paget's disease of bone]

ICD-10-CM Codes›M00–M99›M86-M90›M88

ICD-10-CM M88
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M88 is a non-billable ICD-10-CM category code for osteitis deformans [Paget's disease of bone], so it cannot be submitted on claims. Use a more specific code from this category instead, such as M88.0, M88.1, M88.811, and M88.812.

Code Identity

ICD-10-CM Code
M88
Billable Status
No — Non-Billable Category
Code Describes
Osteitis deformans [Paget's disease of bone]
Short Description
Osteitis deformans [Paget's disease of bone]
Same as the full description in the CMS dataset.
Chapter
M86-M90
Other osteopathies

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM86-M90Other osteopathies
CategoryM88Osteitis deformans [Paget's disease of bone]
This CodeM88Osteitis deformans [Paget's disease of bone]

Specific Coding for Osteitis deformans [Paget's disease of bone]Overview

Non-specific codes like M88 require more characters. Use one of these billable codes instead:

  • Use M88.0 for Osteitis deformans of skull

  • Use M88.1 for Osteitis deformans of vertebrae

  • M88.8 for Osteitis deformans of other bones

  • M88.81 for Osteitis deformans of shoulder

  • M88.82 for Osteitis deformans of upper arm

  • M88.83 for Osteitis deformans of forearm

  • M88.84 for Osteitis deformans of hand

  • M88.85 for Osteitis deformans of thigh

  • M88.86 for Osteitis deformans of lower leg

  • M88.87 for Osteitis deformans of ankle and foot

  • Use M88.88 for Osteitis deformans of other bones

  • Use M88.89 for Osteitis deformans of multiple sites

  • Use M88.9 for Osteitis deformans of unspecified bone

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Type 1 Excludes

  • osteitis deformans in neoplastic disease M90.6

Clinical InformationClinical

  • Osteitis Deformans

    a disease marked by repeated episodes of increased bone resorption followed by excessive attempts at repair, resulting in weakened, deformed bones of increased mass. the resultant architecture of the bone assumes a mosaic pattern in which the fibers take on a haphazard pattern instead of the normal parallel symmetry.

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.

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 M88Overview

Is M88 (Osteitis deformans [Paget's disease of bone]) a billable code?

No. This is a category header that groups the codes for osteitis deformans [Paget's disease of bone], and headers cannot be submitted on claims. Claims for osteitis deformans [Paget's disease of bone] need a more specific code from this category, such as M88.0, M88.1, and M88.811.