2026 ICD-10-CM Diagnosis Code M17Osteoarthritis of knee

ICD-10-CM Codes›M00–M99›M15-M19›M17

ICD-10-CM M17
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M17 is a non-billable ICD-10-CM category code for osteoarthritis of knee, so it cannot be submitted on claims. Use a more specific code from this category instead, such as M17.0, M17.10, M17.11, and M17.12.

Code Identity

ICD-10-CM Code
M17
Billable Status
No — Non-Billable Category
Code Describes
Osteoarthritis of knee
Chapter
M15-M19
Osteoarthritis

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM15-M19Osteoarthritis
CategoryM17Osteoarthritis of knee
This CodeM17Osteoarthritis of knee

Specific Coding for Osteoarthritis of kneeOverview

Non-specific codes like M17 require more characters. Use one of these billable codes instead:

  • Use M17.0 for Bilateral primary osteoarthritis of knee

  • M17.1 for Unilateral primary osteoarthritis of knee

  • Use M17.10 for Unilateral primary osteoarthritis, unspecified knee

  • Use M17.11 for Unilateral primary osteoarthritis, right knee

  • Use M17.12 for Unilateral primary osteoarthritis, left knee

  • Use M17.2 for Bilateral post-traumatic osteoarthritis of knee

  • M17.3 for Unilateral post-traumatic osteoarthritis of knee

  • Use M17.30 for Unilateral post-traumatic osteoarthritis, unspecified knee

  • Use M17.31 for Unilateral post-traumatic osteoarthritis, right knee

  • Use M17.32 for Unilateral post-traumatic osteoarthritis, left knee

  • Use M17.4 for Other bilateral secondary osteoarthritis of knee

  • Use M17.5 for Other unilateral secondary osteoarthritis of knee

  • Use M17.9 for Osteoarthritis of knee, unspecified

Patient EducationClinical

Osteoarthritis

Osteoarthritis, sometimes called OA, is a type of arthritis that only affects the joints, usually in the hands, knees, hips, neck, and lower back. It's the most common type of arthritis.

The full article covers:

  • What is osteoarthritis?
  • What are the symptoms of osteoarthritis?
  • What causes osteoarthritis?
  • Who is more likely to develop osteoarthritis?
  • How is osteoarthritis diagnosed?
  • What are the treatments for osteoarthritis?

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 M17Overview

Is M17 (Osteoarthritis of knee) a billable code?

No. This is a category header that groups the codes for osteoarthritis of knee, and headers cannot be submitted on claims. Claims for osteoarthritis of knee need a more specific code from this category, such as M17.0, M17.10, and M17.11.