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M13.1

Non-billable

Monoarthritis, not elsewhere classified

M13.1 is the ICD-10-CM code for Monoarthritis, not elsewhere classified. It is a non-billable category code — use a more specific child code such as M13.10 for billing.

Status
Header (non-billable)
Chapter
M00-M99
Parent
M13
Subcodes
8
Edition
FY2026

M00-M99 Diseases of the musculoskeletal system and connective tissue

No additional coding notes for this code.

Frequently asked questions

What is ICD-10 code M13.1?
M13.1 is the ICD-10-CM code for "Monoarthritis, not elsewhere classified". It falls under M00-M99 Diseases of the musculoskeletal system and connective tissue.
Is M13.1 a billable code?
No — M13.1 is a non-billable header code. Use a more specific child code (such as M13.10) for billing.
What are the subcodes of M13.1?
M13.1 has 8 more specific child codes, including M13.10, M13.11, M13.12.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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