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M01.X

⚠ Non-billable (Header)

Direct infection of joint in infectious and parasitic diseases classified elsewhere

Diseases of the musculoskeletal system and connective tissue (M00-M99)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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❌ Excludes1

inherited

Rules inherited from parent codes in the hierarchy.

M01
  • • arthropathy in Lyme disease (A69.23)
  • • gonococcal arthritis (A54.42)
  • • meningococcal arthritis (A39.83)
  • • mumps arthritis (B26.85)
  • • postinfective arthropathy (M02.-)
  • • postmeningococcal arthritis (A39.84)
  • • reactive arthritis (M02.3)
  • • rubella arthritis (B06.82)
  • • sarcoidosis arthritis (D86.86)
  • • typhoid fever arthritis (A01.04)
  • • tuberculosis arthritis (A18.01-A18.02)

📋 Code Instructions

inherited
M01
  • • Code first: underlying disease, such as:
  • • Code first: leprosy [Hansen's disease] (A30.-)
  • • Code first: mycoses (B35-B49)
  • • Code first: O'nyong-nyong fever (A92.1)
  • • Code first: paratyphoid fever (A01.1-A01.4)

Child Codes (10)

M01.X0Direct infection of unspecified joint in infectious and parasitic diseases classified elsewhereM01.X1Direct infection of shoulder joint in infectious and parasitic diseases classified elsewhereM01.X2Direct infection of elbow in infectious and parasitic diseases classified elsewhereM01.X3Direct infection of wrist in infectious and parasitic diseases classified elsewhereM01.X4Direct infection of hand in infectious and parasitic diseases classified elsewhereM01.X5Direct infection of hip in infectious and parasitic diseases classified elsewhereM01.X6Direct infection of knee in infectious and parasitic diseases classified elsewhereM01.X7Direct infection of ankle and foot in infectious and parasitic diseases classified elsewhereM01.X8Direct infection of vertebrae in infectious and parasitic diseases classified elsewhereM01.X9Direct infection of multiple joints in infectious and parasitic diseases classified elsewhere

Clinical Description

ICD-10-CM code M01.X represents direct infection of joint in infectious and parasitic diseases classified elsewhere. This code falls under the Diseases of the musculoskeletal system and connective tissue (M00-M99) classification. It is a non-billable category header code. A more specific child code from the list below must be used for billing and reimbursement purposes.

This is a 5-character code at the 4th level of specificity. There are 10 more specific child codes under M01.X. Coders should note that M01.X has 11 Excludes1 restriction(s) — codes that cannot be reported together on the same claim.

Frequently Asked Questions

What is ICD-10 code M01.X?

ICD-10-CM code M01.X is "Direct infection of joint in infectious and parasitic diseases classified elsewhere". It belongs to the category: Diseases of the musculoskeletal system and connective tissue (M00-M99).

Is M01.X a billable ICD-10 code?

No, M01.X is a non-billable header code. A more specific child code must be used for billing.

What codes are excluded with M01.X?

M01.X has 11 Excludes1 rule(s). These codes are mutually exclusive and cannot be coded together on the same claim.

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Code Information

CodeM01.X
BillableNo — Header code
ParentM01
CategoryDiseases of the musculoskeletal system and connective tissue (M00-M99)
Excludes111 rule(s)
Excludes20 note(s)
Child codes10

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)