Other arthritis (M13) ICD-10-CM
The M13 code range covers other arthritis with 64 ICD-10-CM diagnosis codes. 47 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the M13 Range 64 codes · 47 billable
- M13 Other arthritisNon-billable
- M13.0 Polyarthritis, unspecified
- M13.1 Monoarthritis, not elsewhere classifiedNon-billable
- M13.10 Monoarthritis, not elsewhere classified, unspecified site
- M13.11 Monoarthritis, not elsewhere classified, shoulderNon-billable
- M13.111 Monoarthritis, not elsewhere classified, right shoulder
- M13.112 Monoarthritis, not elsewhere classified, left shoulder
- M13.119 Monoarthritis, not elsewhere classified, unspecified shoulder
- M13.12 Monoarthritis, not elsewhere classified, elbowNon-billable
- M13.121 Monoarthritis, not elsewhere classified, right elbow
- M13.122 Monoarthritis, not elsewhere classified, left elbow
- M13.129 Monoarthritis, not elsewhere classified, unspecified elbow
- M13.13 Monoarthritis, not elsewhere classified, wristNon-billable
- M13.131 Monoarthritis, not elsewhere classified, right wrist
- M13.132 Monoarthritis, not elsewhere classified, left wrist
- M13.139 Monoarthritis, not elsewhere classified, unspecified wrist
- M13.14 Monoarthritis, not elsewhere classified, handNon-billable
- M13.141 Monoarthritis, not elsewhere classified, right hand
- M13.142 Monoarthritis, not elsewhere classified, left hand
- M13.149 Monoarthritis, not elsewhere classified, unspecified hand
- M13.15 Monoarthritis, not elsewhere classified, hipNon-billable
- M13.151 Monoarthritis, not elsewhere classified, right hip
- M13.152 Monoarthritis, not elsewhere classified, left hip
- M13.159 Monoarthritis, not elsewhere classified, unspecified hip
- M13.16 Monoarthritis, not elsewhere classified, kneeNon-billable
- M13.161 Monoarthritis, not elsewhere classified, right knee
- M13.162 Monoarthritis, not elsewhere classified, left knee
- M13.169 Monoarthritis, not elsewhere classified, unspecified knee
- M13.17 Monoarthritis, not elsewhere classified, ankle and footNon-billable
- M13.171 Monoarthritis, not elsewhere classified, right ankle and foot
- M13.172 Monoarthritis, not elsewhere classified, left ankle and foot
- M13.179 Monoarthritis, not elsewhere classified, unspecified ankle and foot
- M13.8 Other specified arthritisNon-billable
- M13.80 Other specified arthritis, unspecified site
- M13.81 Other specified arthritis, shoulderNon-billable
- M13.811 Other specified arthritis, right shoulder
- M13.812 Other specified arthritis, left shoulder
- M13.819 Other specified arthritis, unspecified shoulder
- M13.82 Other specified arthritis, elbowNon-billable
- M13.821 Other specified arthritis, right elbow
- M13.822 Other specified arthritis, left elbow
- M13.829 Other specified arthritis, unspecified elbow
- M13.83 Other specified arthritis, wristNon-billable
- M13.831 Other specified arthritis, right wrist
- M13.832 Other specified arthritis, left wrist
- M13.839 Other specified arthritis, unspecified wrist
- M13.84 Other specified arthritis, handNon-billable
- M13.841 Other specified arthritis, right hand
- M13.842 Other specified arthritis, left hand
- M13.849 Other specified arthritis, unspecified hand
- M13.85 Other specified arthritis, hipNon-billable
- M13.851 Other specified arthritis, right hip
- M13.852 Other specified arthritis, left hip
- M13.859 Other specified arthritis, unspecified hip
- M13.86 Other specified arthritis, kneeNon-billable
- M13.861 Other specified arthritis, right knee
- M13.862 Other specified arthritis, left knee
- M13.869 Other specified arthritis, unspecified knee
- M13.87 Other specified arthritis, ankle and footNon-billable
- M13.871 Other specified arthritis, right ankle and foot
- M13.872 Other specified arthritis, left ankle and foot
- M13.879 Other specified arthritis, unspecified ankle and foot
- M13.88 Other specified arthritis, other site
- M13.89 Other specified arthritis, multiple sites
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the M13 range.
Polyarticular Arthritis
An arthritis affecting five or more separate joints.
About the M13 Code Range
Other arthritis is grouped here by whether it affects multiple joints, one joint, or fits another specified description.
M13.0 identifies polyarthritis, or arthritis in multiple joints, when the type is unspecified. M13.1 identifies monoarthritis, or arthritis in one joint, and its subdivisions name the joint site. M13.8 identifies other specified arthritis; its subdivisions distinguish joint sites, other sites, multiple sites, and an unspecified site.
Questions About This Page
How many billable codes are in the M13 range?
Of the 64 codes in this range, 47 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the M13 range classify?
The range classifies other arthritis. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
