Is M45.A a billable ICD-10 code?

No. M45.A is a non-billable header code. Use a more specific subcategory for claims.

M45.A ⚠ Non-billable

Non-radiographic axial spondyloarthritis

Q: What is ICD-10 code M45.A?

ICD-10-CM code M45.A stands for "Non-radiographic axial spondyloarthritis". It is a non-billable header code in the Diseases of the Musculoskeletal System and Connective Tissue chapter, effective FY2026 (Oct 1, 2025 – Sep 30, 2026).

ICD-10-CM · FY2026 · Diseases of the Musculoskeletal System and Connective Tissue

Code

M45.A

System

ICD-10-CM

Billable

No — use specific code

Effective

FY2026

Chapter

Diseases of the Musculoskeletal System and Connective Tissue

Source

CMS / CDC NCHS

⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.

Frequently asked questions

What is ICD-10 code M45.A?

ICD-10-CM code M45.A represents Non-radiographic axial spondyloarthritis. It is a non-billable header code requiring a more specific subcategory in the Diseases of the Musculoskeletal System and Connective Tissue chapter, effective October 1, 2025 – September 30, 2026.

Is M45.A billable?

No. M45.A is a non-billable header. Select a more specific subcategory for claims submission.

What chapter is M45.A in?

M45.A belongs to the Diseases of the Musculoskeletal System and Connective Tissue chapter (M00–M99) of ICD-10-CM.

Related codes in the M45 category

M45 Ankylosing spondylitis Non-billable M45.0 Ankylosing spondylitis of multiple sites in spine Billable M45.1 Ankylosing spondylitis of occipito-atlanto-axial region Billable M45.2 Ankylosing spondylitis of cervical region Billable M45.3 Ankylosing spondylitis of cervicothoracic region Billable M45.4 Ankylosing spondylitis of thoracic region Billable M45.5 Ankylosing spondylitis of thoracolumbar region Billable M45.6 Ankylosing spondylitis lumbar region Billable

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