2026 ICD-10-CM Diagnosis Code M12Other and unspecified arthropathy

ICD-10-CM Codes›M00–M99›M05-M14›M12

ICD-10-CM M12
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M12 is a non-billable ICD-10-CM category code for other and unspecified arthropathy, so it cannot be submitted on claims. Use a more specific code from this category instead, such as M12.00, M12.011, M12.012, and M12.019.

Code Identity

ICD-10-CM Code
M12
Billable Status
No — Non-Billable Category
Code Describes
Other and unspecified arthropathy
Chapter
M05-M14
Inflammatory polyarthropathies

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM05-M14Inflammatory polyarthropathies
CategoryM12Other and unspecified arthropathy
This CodeM12Other and unspecified arthropathy

Specific Coding for Other and unspecified arthropathyOverview

Non-specific codes like M12 require more characters. Use one of these billable codes instead:

  • M12.0 for Chronic postrheumatic arthropathy [Jaccoud]

  • Use M12.00 for Chronic postrheumatic arthropathy [Jaccoud], unspecified site

  • M12.01 for Chronic postrheumatic arthropathy [Jaccoud], shoulder

  • M12.02 for Chronic postrheumatic arthropathy [Jaccoud], elbow

  • M12.03 for Chronic postrheumatic arthropathy [Jaccoud], wrist

  • M12.04 for Chronic postrheumatic arthropathy [Jaccoud], hand

  • M12.05 for Chronic postrheumatic arthropathy [Jaccoud], hip

  • M12.06 for Chronic postrheumatic arthropathy [Jaccoud], knee

  • M12.07 for Chronic postrheumatic arthropathy [Jaccoud], ankle and foot

  • Use M12.08 for Chronic postrheumatic arthropathy [Jaccoud], other specified site

  • Use M12.09 for Chronic postrheumatic arthropathy [Jaccoud], multiple sites

  • M12.1 for Kaschin-Beck disease

  • Use M12.10 for Kaschin-Beck disease, unspecified site

  • M12.11 for Kaschin-Beck disease, shoulder

  • M12.12 for Kaschin-Beck disease, elbow

  • M12.13 for Kaschin-Beck disease, wrist

  • M12.14 for Kaschin-Beck disease, hand

  • M12.15 for Kaschin-Beck disease, hip

  • M12.16 for Kaschin-Beck disease, knee

  • M12.17 for Kaschin-Beck disease, ankle and foot

  • Use M12.18 for Kaschin-Beck disease, vertebrae

  • Use M12.19 for Kaschin-Beck disease, multiple sites

  • M12.2 for Villonodular synovitis (pigmented)

  • Use M12.20 for Villonodular synovitis (pigmented), unspecified site

  • M12.21 for Villonodular synovitis (pigmented), shoulder

  • M12.22 for Villonodular synovitis (pigmented), elbow

  • M12.23 for Villonodular synovitis (pigmented), wrist

  • M12.24 for Villonodular synovitis (pigmented), hand

  • M12.25 for Villonodular synovitis (pigmented), hip

  • M12.26 for Villonodular synovitis (pigmented), knee

  • M12.27 for Villonodular synovitis (pigmented), ankle and foot

  • Use M12.28 for Villonodular synovitis (pigmented), other specified site

  • Use M12.29 for Villonodular synovitis (pigmented), multiple sites

  • M12.3 for Palindromic rheumatism

  • Use M12.30 for Palindromic rheumatism, unspecified site

  • M12.31 for Palindromic rheumatism, shoulder

  • M12.32 for Palindromic rheumatism, elbow

  • M12.33 for Palindromic rheumatism, wrist

  • M12.34 for Palindromic rheumatism, hand

  • M12.35 for Palindromic rheumatism, hip

  • M12.36 for Palindromic rheumatism, knee

  • M12.37 for Palindromic rheumatism, ankle and foot

  • Use M12.38 for Palindromic rheumatism, other specified site

  • Use M12.39 for Palindromic rheumatism, multiple sites

  • M12.4 for Intermittent hydrarthrosis

  • Use M12.40 for Intermittent hydrarthrosis, unspecified site

  • M12.41 for Intermittent hydrarthrosis, shoulder

  • M12.42 for Intermittent hydrarthrosis, elbow

  • M12.43 for Intermittent hydrarthrosis, wrist

  • M12.44 for Intermittent hydrarthrosis, hand

  • M12.45 for Intermittent hydrarthrosis, hip

  • M12.46 for Intermittent hydrarthrosis, knee

  • M12.47 for Intermittent hydrarthrosis, ankle and foot

  • Use M12.48 for Intermittent hydrarthrosis, other site

  • Use M12.49 for Intermittent hydrarthrosis, multiple sites

  • M12.5 for Traumatic arthropathy

  • Use M12.50 for Traumatic arthropathy, unspecified site

  • M12.51 for Traumatic arthropathy, shoulder

  • M12.52 for Traumatic arthropathy, elbow

  • M12.53 for Traumatic arthropathy, wrist

  • M12.54 for Traumatic arthropathy, hand

  • M12.55 for Traumatic arthropathy, hip

  • M12.56 for Traumatic arthropathy, knee

  • M12.57 for Traumatic arthropathy, ankle and foot

  • Use M12.58 for Traumatic arthropathy, other specified site

  • Use M12.59 for Traumatic arthropathy, multiple sites

  • M12.8 for Other specific arthropathies, not elsewhere classified

  • Use M12.80 for Other specific arthropathies, not elsewhere classified, unspecified site

  • M12.81 for Other specific arthropathies, not elsewhere classified, shoulder

  • M12.82 for Other specific arthropathies, not elsewhere classified, elbow

  • M12.83 for Other specific arthropathies, not elsewhere classified, wrist

  • M12.84 for Other specific arthropathies, not elsewhere classified, hand

  • M12.85 for Other specific arthropathies, not elsewhere classified, hip

  • M12.86 for Other specific arthropathies, not elsewhere classified, knee

  • M12.87 for Other specific arthropathies, not elsewhere classified, ankle and foot

  • Use M12.88 for Other specific arthropathies, not elsewhere classified, other specified site

  • Use M12.89 for Other specific arthropathies, not elsewhere classified, multiple sites

  • Use M12.9 for Arthropathy, unspecified

Tabular List NotesGuidance

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

Type 1 Excludes

Patient EducationClinical

Arthritis

If you feel pain and stiffness in your body or have trouble moving around, you might have arthritis. Any disorder that affects the joints is often called arthritis. Joints are places where two bones meet, such as your elbow or knee.

The full article covers:

  • What is arthritis?
  • What are the types of arthritis?
  • What are the symptoms of arthritis?
  • Who is more likely to get arthritis?
  • How is arthritis diagnosed?
  • What are the treatments for arthritis?

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 M12Overview

Is M12 (Other and unspecified arthropathy) a billable code?

No. This is a category header that groups the codes for other and unspecified arthropathy, and headers cannot be submitted on claims. Claims for other and unspecified arthropathy need a more specific code from this category, such as M12.00, M12.011, and M12.012.