M45

M45: Ankylosing spondylitis

Non-billable headerICD-10-CM

M45 is a non-billable header ICD-10-CM code for ankylosing spondylitis. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1: never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

arthropathy in Reiter's disease (M02.3-)
juvenile (ankylosing) spondylitis (M08.1)

Excludes2: not included here, but may coexist

The excluded condition is not part of this code, but a patient can have both. You may code both.

Behçet's disease (M35.2)

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Rheumatoid arthritis of spine

Other codes that can never be billed with M45

Their own Excludes1 notes name this code, so the conflict is not listed above.

G55Nerve root and plexus compressions in diseases classified elsewhere
M08.1Juvenile ankylosing spondylitis
M43.2Fusion of spine
M05Rheumatoid arthritis with rheumatoid factor

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Code history

Unchanged in every release from FY2024 to FY2027.

Code to one of these instead M45

11 child codes. Green means billable.