Is M45.2 a billable ICD-10-CM code?

Yes. M45.2 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does M45.2 sit in the tabular list?

Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Spondylopathies (M45-M49).

What cannot be coded together with M45.2?

M45.2 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above M45.2 (M45) and apply to it just the same.

M45.2

M45.2 — Ankylosing spondylitis of cervical region

Billable / specific codeICD-10-CM

M45.2 is a billable, specific ICD-10-CM code for ankylosing spondylitis of cervical region. It is valid for submission on a claim.

Excludes1 inherited from the categories above M45.2

These are not written on M45.2, but they bind it: a note on a category applies to every code beneath it. Billing M45.2 with anything listed here is a denial.

Written on M45 — Ankylosing spondylitis

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

Excludes2 inherited from the categories above M45.2

Also inherited, and the opposite of Excludes1: these conditions are not part of M45.2, but a patient can have both, so you may code both.

Written on M45 — Ankylosing spondylitis

Behçet's disease (M35.2)

Other codes that can never be billed with M45.2

These codes carry an Excludes1 note pointing at M45.2. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading M45.2 alone.

G55Nerve root and plexus compressions in diseases classified elsewhere
M05Rheumatoid arthritis with rheumatoid factor

Risk adjustment

M45.2 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:

HCC 93 Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders0.617 RAF

Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.

Medicare coverage

M45.2 is named in 17 Medicare coverage policies — 10 listing it as supporting medical necessity, and 7 listing it as NOT covered. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A58865Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Woundnot covered
A58883Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Woundnot covered
A58893Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Woundnot covered
A59374Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Woundnot covered

How M45.2 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to M45.2.

Spondylitis›ankylosing›cervical region

Code history

M45.2 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share M45. If M45.2 is not quite right, the correct code is usually one of these.

Questions about M45.2

Is M45.2 a billable ICD-10-CM code?: Yes. M45.2 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does M45.2 sit in the tabular list?: Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Spondylopathies (M45-M49).
What cannot be coded together with M45.2?: M45.2 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above M45.2 (M45) and apply to it just the same.