ICD-10-CM 2027 diagnosis code
M12Other and unspecified arthropathy
M12 is a header code, so it can't be reported by itself. Choose one of the 8 more specific codes beneath it.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About M12
M12 is the ICD-10-CM diagnosis code for other and unspecified arthropathy. It belongs to block M05-M14 (inflammatory polyarthropathies) and chapter 13 (diseases of the musculoskeletal system and connective tissue). It is a header code, so it can't be reported by itself; one of its 8 subcodes must be used instead.
To report this condition, pick the subcode that matches the documentation: M12.0 ([Jaccoud]), M12.1 (disease), M12.2 ((pigmented)), M12.3 (rheumatism), M12.4 (hydrarthrosis), M12.5 (arthropathy), M12.8 (classified) and M12.9 (unspecified).
Don't report M12 together with the conditions in its Excludes1 note: arthrosis (M15-M19) and cricoarytenoid arthropathy (J38.7).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Specific codes under M12
- M12.0Chronic postrheumatic arthropathy [Jaccoud]
- M12.00Chronic postrheumatic arthropathy [Jaccoud], unspecified siteBillable
- M12.01Chronic postrheumatic arthropathy [Jaccoud], shoulder
- M12.02Chronic postrheumatic arthropathy [Jaccoud], elbow
- M12.03Chronic postrheumatic arthropathy [Jaccoud], wrist
- M12.04Chronic postrheumatic arthropathy [Jaccoud], hand
- M12.05Chronic postrheumatic arthropathy [Jaccoud], hip
- M12.06Chronic postrheumatic arthropathy [Jaccoud], knee
- M12.07Chronic postrheumatic arthropathy [Jaccoud], ankle and foot
- M12.08Chronic postrheumatic arthropathy [Jaccoud], other specified siteBillable
- M12.09Chronic postrheumatic arthropathy [Jaccoud], multiple sitesBillable
- M12.1Kaschin-Beck disease
- M12.10Kaschin-Beck disease, unspecified siteBillable
- M12.11Kaschin-Beck disease, shoulder
- M12.12Kaschin-Beck disease, elbow
- M12.13Kaschin-Beck disease, wrist
- M12.14Kaschin-Beck disease, hand
- M12.15Kaschin-Beck disease, hip
- M12.16Kaschin-Beck disease, knee
- M12.17Kaschin-Beck disease, ankle and foot
- M12.18Kaschin-Beck disease, vertebraeBillable
- M12.19Kaschin-Beck disease, multiple sitesBillable
- M12.2Villonodular synovitis (pigmented)
- M12.20Villonodular synovitis (pigmented), unspecified siteBillable
- M12.21Villonodular synovitis (pigmented), shoulder
- M12.22Villonodular synovitis (pigmented), elbow
- M12.23Villonodular synovitis (pigmented), wrist
- M12.24Villonodular synovitis (pigmented), hand
- M12.25Villonodular synovitis (pigmented), hip
- M12.26Villonodular synovitis (pigmented), knee
- M12.27Villonodular synovitis (pigmented), ankle and foot
- M12.28Villonodular synovitis (pigmented), other specified siteBillable
- M12.29Villonodular synovitis (pigmented), multiple sitesBillable
- M12.3Palindromic rheumatism
- M12.30Palindromic rheumatism, unspecified siteBillable
- M12.31Palindromic rheumatism, shoulder
- M12.32Palindromic rheumatism, elbow
- M12.33Palindromic rheumatism, wrist
- M12.34Palindromic rheumatism, hand
- M12.35Palindromic rheumatism, hip
- M12.36Palindromic rheumatism, knee
- M12.37Palindromic rheumatism, ankle and foot
- M12.38Palindromic rheumatism, other specified siteBillable
- M12.39Palindromic rheumatism, multiple sitesBillable
- M12.4Intermittent hydrarthrosis
- M12.40Intermittent hydrarthrosis, unspecified siteBillable
- M12.41Intermittent hydrarthrosis, shoulder
- M12.42Intermittent hydrarthrosis, elbow
- M12.43Intermittent hydrarthrosis, wrist
- M12.44Intermittent hydrarthrosis, hand
- M12.45Intermittent hydrarthrosis, hip
- M12.46Intermittent hydrarthrosis, knee
- M12.47Intermittent hydrarthrosis, ankle and foot
- M12.48Intermittent hydrarthrosis, other siteBillable
- M12.49Intermittent hydrarthrosis, multiple sitesBillable
- M12.5Traumatic arthropathy
- M12.50Traumatic arthropathy, unspecified siteBillable
- M12.51Traumatic arthropathy, shoulder
- M12.52Traumatic arthropathy, elbow
- M12.53Traumatic arthropathy, wrist
- M12.54Traumatic arthropathy, hand
- M12.55Traumatic arthropathy, hip
- M12.56Traumatic arthropathy, knee
- M12.57Traumatic arthropathy, ankle and foot
- M12.58Traumatic arthropathy, other specified siteBillable
- M12.59Traumatic arthropathy, multiple sitesBillable
- M12.8Other specific arthropathies, not elsewhere classified
- M12.80Other specific arthropathies, not elsewhere classified, unspecified siteBillable
- M12.81Other specific arthropathies, not elsewhere classified, shoulder
- M12.82Other specific arthropathies, not elsewhere classified, elbow
- M12.83Other specific arthropathies, not elsewhere classified, wrist
- M12.84Other specific arthropathies, not elsewhere classified, hand
- M12.85Other specific arthropathies, not elsewhere classified, hip
- M12.86Other specific arthropathies, not elsewhere classified, knee
- M12.87Other specific arthropathies, not elsewhere classified, ankle and foot
- M12.88Other specific arthropathies, not elsewhere classified, other specified siteBillable
- M12.89Other specific arthropathies, not elsewhere classified, multiple sitesBillable
- M12.9Arthropathy, unspecifiedBillable
Coding notes
Notes that apply from higher levels
Instructions written at a parent level also apply to M12.
Broader instructions also apply from Chapter 13: Diseases of the musculoskeletal system and connective tissue.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about M12
Is M12 billable?
- No. M12 is a header code. Report one of its more specific subcodes instead.