M08.1 — Juvenile ankylosing spondylitis
M08.1 is a billable, specific ICD-10-CM code for juvenile ankylosing spondylitis. It is valid for submission on a claim.
Excludes1 — never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
- ankylosing spondylitis in adults (M45.0-)
Other codes that can never be billed with M08.1
These codes carry an Excludes1 note pointing at M08.1. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading M08.1 alone.
- M45Ankylosing spondylitis
Risk adjustment
M08.1 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
M08.1 is named in 16 Medicare coverage policies — 10 listing it as supporting medical necessity, and 6 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
- 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
- A59434Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Woundnot covered
How M08.1 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 M08.1.
- Spondylitis›juvenile ankylosing(chronic)
- Spondylitis›ankylosing›juvenile
Related codes at this level
Codes that share M08. If M08.1 is not quite right, the correct code is usually one of these.
Questions about M08.1
- Is M08.1 a billable ICD-10-CM code?
- Yes. M08.1 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does M08.1 sit in the tabular list?
- Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Inflammatory polyarthropathies (M05-M14).
- What cannot be coded together with M08.1?
- M08.1 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.