All ICD10 Codes
M12Not billable, use a more specific code below

Other and unspecified arthropathy

In Inflammatory polyarthropathies (M05-M14), chapter 13: Diseases of the Musculoskeletal System and Connective Tissue

169 billable codes under M12: none are a CC or MCC; 24 map to HCC 94 (Systemic Lupus Erythematosus and Other Specified Systemic Connective Tissue Disorders).An HCC counts toward a Medicare Advantage patient's risk score.

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Instructional notes

Excludes1: not coded here, use a different code

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers site and laterality, acute injury versus chronic musculoskeletal conditions, 7th characters for pathologic fractures, osteoporosis with or without current fracture, and multisystem inflammatory syndrome.

Read Section I.C.13 (page 60)

All codes under M12

M12 can't be used on a claim. Pick a billable code below; grey headings group them.

M12 MS-DRGs

As the principal diagnosis, all 169 billable codes under M12 group to MS-DRG 553 or 554 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

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.

Read more about arthritis on MedlinePlus

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.