M13 Other arthritis

⚠ Non-Billable ICD-10-CM 2026
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The ICD-10-CM code for Other arthritis is M13 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Section
M05-M14: Inflammatory polyarthropathies (M05-M14)
Category M13
64 codes (47 billable)
FY2026 Status
Stable since FY2024
Excludes1
Not coded here. These conditions should NOT be coded together with M13.
  • arthrosis (M15-M19)
  • osteoarthritis (M15-M19)

Official Coding Guidelines

Osteoporosis without pathological fracture (M81)

Category M81, Osteoporosis without current pathological fracture, is for use for patients with osteoporosis who do not currently have a pathologic fracture due to the osteoporosis, even if they have had a fracture in the past. For patients with a history of osteoporosis fractures, status code Z87.310, Personal history of (healed) osteoporosis fracture, should follow the code from M81.

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.13.d.1
Osteoporosis with current pathological fracture (M80)

Category M80, Osteoporosis with current pathological fracture, is for patients who have a current pathologic fracture at the time of an encounter. The codes under M80 identify the site of the fracture. A code from category M80, not a traumatic fracture code, should be used for any patient with known osteoporosis who suffers a fracture, even if the patient had a minor fall or trauma, if that fall or trauma would not usually break a normal, healthy bone.

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.13.d.2

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

Related Codes

More Specific Codes

M13.0 Polyarthritis, unspecified M13.1 Monoarthritis, not elsewhere classified M13.10 Monoarthritis, not elsewhere classified, unspecified site M13.11 Monoarthritis, not elsewhere classified, shoulder 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, elbow 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, wrist 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, hand 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, hip 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, knee 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 foot M13.171 Monoarthritis, not elsewhere classified, right ankle and foot M13.172 Monoarthritis, not elsewhere classified, left ankle and foot

Related Codes in M13

M13.0 Polyarthritis, unspecified M13.1 Monoarthritis, not elsewhere classified M13.10 Monoarthritis, not elsewhere classified, unspecified site M13.11 Monoarthritis, not elsewhere classified, shoulder 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, elbow 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, wrist 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, hand 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, hip
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Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

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