ICD-10-CM category
M13: Other arthritis
Codes under M13 (Other arthritis). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| M13.0 | Polyarthritis, unspecified | ✓ |
| M13.0 | Polyarthritis, unspecified | ✓ |
| M13.1 | Monoarthritis, not elsewhere classified | — |
| M13.1 | Monoarthritis, not elsewhere classified | — |
| M13.8 | Other specified arthritis | — |
| M13.8 | Other specified arthritis | — |
| M13.10 | Monoarthritis, not elsewhere classified, unspecified site | ✓ |
| M13.10 | Monoarthritis, not elsewhere classified, unspecified site | ✓ |
| M13.11 | Monoarthritis, not elsewhere classified, shoulder | — |
| M13.11 | Monoarthritis, not elsewhere classified, shoulder | — |
| M13.12 | Monoarthritis, not elsewhere classified, elbow | — |
| M13.12 | Monoarthritis, not elsewhere classified, elbow | — |
| M13.13 | Monoarthritis, not elsewhere classified, wrist | — |
| M13.13 | Monoarthritis, not elsewhere classified, wrist | — |
| M13.14 | Monoarthritis, not elsewhere classified, hand | — |
| M13.14 | Monoarthritis, not elsewhere classified, hand | — |
| M13.15 | Monoarthritis, not elsewhere classified, hip | — |
| M13.15 | Monoarthritis, not elsewhere classified, hip | — |
| M13.16 | Monoarthritis, not elsewhere classified, knee | — |
| M13.16 | Monoarthritis, not elsewhere classified, knee | — |
| M13.17 | Monoarthritis, not elsewhere classified, ankle and foot | — |
| M13.17 | Monoarthritis, not elsewhere classified, ankle and foot | — |
| M13.80 | Other specified arthritis, unspecified site | ✓ |
| M13.80 | Other specified arthritis, unspecified site | ✓ |
| M13.81 | Other specified arthritis, shoulder | — |
| M13.81 | Other specified arthritis, shoulder | — |
| M13.82 | Other specified arthritis, elbow | — |
| M13.82 | Other specified arthritis, elbow | — |
| M13.83 | Other specified arthritis, wrist | — |
| M13.83 | Other specified arthritis, wrist | — |
| M13.84 | Other specified arthritis, hand | — |
| M13.84 | Other specified arthritis, hand | — |
| M13.85 | Other specified arthritis, hip | — |
| M13.85 | Other specified arthritis, hip | — |
| M13.86 | Other specified arthritis, knee | — |
| M13.86 | Other specified arthritis, knee | — |
| M13.87 | Other specified arthritis, ankle and foot | — |
| M13.87 | Other specified arthritis, ankle and foot | — |
| M13.88 | Other specified arthritis, other site | ✓ |
| M13.88 | Other specified arthritis, other site | ✓ |
| M13.89 | Other specified arthritis, multiple sites | ✓ |
| M13.89 | Other specified arthritis, multiple sites | ✓ |
| M13.111 | Monoarthritis, not elsewhere classified, right shoulder | ✓ |
| M13.111 | Monoarthritis, not elsewhere classified, right shoulder | ✓ |
| M13.112 | Monoarthritis, not elsewhere classified, left shoulder | ✓ |
| M13.112 | Monoarthritis, not elsewhere classified, left shoulder | ✓ |
| M13.119 | Monoarthritis, not elsewhere classified, unspecified shoulder | ✓ |
| M13.119 | Monoarthritis, not elsewhere classified, unspecified shoulder | ✓ |
| M13.121 | Monoarthritis, not elsewhere classified, right elbow | ✓ |
| M13.121 | Monoarthritis, not elsewhere classified, right elbow | ✓ |
| M13.122 | Monoarthritis, not elsewhere classified, left elbow | ✓ |
| M13.122 | Monoarthritis, not elsewhere classified, left elbow | ✓ |
| M13.129 | Monoarthritis, not elsewhere classified, unspecified elbow | ✓ |
| M13.129 | Monoarthritis, not elsewhere classified, unspecified elbow | ✓ |
| M13.131 | Monoarthritis, not elsewhere classified, right wrist | ✓ |
| M13.131 | Monoarthritis, not elsewhere classified, right wrist | ✓ |
| M13.132 | Monoarthritis, not elsewhere classified, left wrist | ✓ |
| M13.132 | Monoarthritis, not elsewhere classified, left wrist | ✓ |
| M13.139 | Monoarthritis, not elsewhere classified, unspecified wrist | ✓ |
| M13.139 | Monoarthritis, not elsewhere classified, unspecified wrist | ✓ |
| M13.141 | Monoarthritis, not elsewhere classified, right hand | ✓ |
| M13.141 | Monoarthritis, not elsewhere classified, right hand | ✓ |
| M13.142 | Monoarthritis, not elsewhere classified, left hand | ✓ |
| M13.142 | Monoarthritis, not elsewhere classified, left hand | ✓ |
| M13.149 | Monoarthritis, not elsewhere classified, unspecified hand | ✓ |
| M13.149 | Monoarthritis, not elsewhere classified, unspecified hand | ✓ |
| M13.151 | Monoarthritis, not elsewhere classified, right hip | ✓ |
| M13.151 | Monoarthritis, not elsewhere classified, right hip | ✓ |
| M13.152 | Monoarthritis, not elsewhere classified, left hip | ✓ |
| M13.152 | Monoarthritis, not elsewhere classified, left hip | ✓ |
| M13.159 | Monoarthritis, not elsewhere classified, unspecified hip | ✓ |
| M13.159 | Monoarthritis, not elsewhere classified, unspecified hip | ✓ |
| M13.161 | Monoarthritis, not elsewhere classified, right knee | ✓ |
| M13.161 | Monoarthritis, not elsewhere classified, right knee | ✓ |
| M13.162 | Monoarthritis, not elsewhere classified, left knee | ✓ |
| M13.162 | Monoarthritis, not elsewhere classified, left knee | ✓ |
| M13.169 | Monoarthritis, not elsewhere classified, unspecified knee | ✓ |
| M13.169 | Monoarthritis, not elsewhere classified, unspecified knee | ✓ |
| M13.171 | Monoarthritis, not elsewhere classified, right ankle and foot | ✓ |
| M13.171 | Monoarthritis, not elsewhere classified, right ankle and foot | ✓ |
| M13.172 | Monoarthritis, not elsewhere classified, left ankle and foot | ✓ |
| M13.172 | Monoarthritis, not elsewhere classified, left ankle and foot | ✓ |
| M13.179 | Monoarthritis, not elsewhere classified, unspecified ankle and foot | ✓ |
| M13.179 | Monoarthritis, not elsewhere classified, unspecified ankle and foot | ✓ |
| M13.811 | Other specified arthritis, right shoulder | ✓ |
| M13.811 | Other specified arthritis, right shoulder | ✓ |
| M13.812 | Other specified arthritis, left shoulder | ✓ |
| M13.812 | Other specified arthritis, left shoulder | ✓ |
| M13.819 | Other specified arthritis, unspecified shoulder | ✓ |
| M13.819 | Other specified arthritis, unspecified shoulder | ✓ |
| M13.821 | Other specified arthritis, right elbow | ✓ |
| M13.821 | Other specified arthritis, right elbow | ✓ |
| M13.822 | Other specified arthritis, left elbow | ✓ |
| M13.822 | Other specified arthritis, left elbow | ✓ |
| M13.829 | Other specified arthritis, unspecified elbow | ✓ |
| M13.829 | Other specified arthritis, unspecified elbow | ✓ |
| M13.831 | Other specified arthritis, right wrist | ✓ |
| M13.831 | Other specified arthritis, right wrist | ✓ |
| M13.832 | Other specified arthritis, left wrist | ✓ |
| M13.832 | Other specified arthritis, left wrist | ✓ |
| M13.839 | Other specified arthritis, unspecified wrist | ✓ |
| M13.839 | Other specified arthritis, unspecified wrist | ✓ |
| M13.841 | Other specified arthritis, right hand | ✓ |
| M13.841 | Other specified arthritis, right hand | ✓ |
| M13.842 | Other specified arthritis, left hand | ✓ |
| M13.842 | Other specified arthritis, left hand | ✓ |
| M13.849 | Other specified arthritis, unspecified hand | ✓ |
| M13.849 | Other specified arthritis, unspecified hand | ✓ |
| M13.851 | Other specified arthritis, right hip | ✓ |
| M13.851 | Other specified arthritis, right hip | ✓ |
| M13.852 | Other specified arthritis, left hip | ✓ |
| M13.852 | Other specified arthritis, left hip | ✓ |
| M13.859 | Other specified arthritis, unspecified hip | ✓ |
| M13.859 | Other specified arthritis, unspecified hip | ✓ |
| M13.861 | Other specified arthritis, right knee | ✓ |
| M13.861 | Other specified arthritis, right knee | ✓ |
| M13.862 | Other specified arthritis, left knee | ✓ |
| M13.862 | Other specified arthritis, left knee | ✓ |
| M13.869 | Other specified arthritis, unspecified knee | ✓ |
| M13.869 | Other specified arthritis, unspecified knee | ✓ |
| M13.871 | Other specified arthritis, right ankle and foot | ✓ |
| M13.871 | Other specified arthritis, right ankle and foot | ✓ |
| M13.872 | Other specified arthritis, left ankle and foot | ✓ |
| M13.872 | Other specified arthritis, left ankle and foot | ✓ |
| M13.879 | Other specified arthritis, unspecified ankle and foot | ✓ |
| M13.879 | Other specified arthritis, unspecified ankle and foot | ✓ |
Frequently asked questions
What is ICD-10-CM code M13?
M13 is an ICD-10-CM category covering Other arthritis. It contains 126 more specific diagnosis codes, 94 of which are billable.
Is M13 a billable code?
No — M13 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example M13.0 — Polyarthritis, unspecified). 94 of the 126 codes under M13 are billable.
What codes fall under M13?
M13 includes M13.0, M13.0, M13.1, M13.1, M13.8, plus 121 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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