Other specified arthritis
Other specified arthritis
M13.8 is a header (parent) code in the ICD-10-CM hierarchy. It is not billable for claim submission. Use one of the billable child codes listed below.
Billable codes in this category
Each of the codes below is billable. Choose the one that most accurately describes the patient's diagnosis.
M13.80 classifies a named arthritis type that falls outside other defined arthritis categories when the affected joint site is not documented or is not the focus of the encounter.
Inflammatory arthritis affecting an anatomical site not captured by any other specific joint-level code in the M13.8 subcategory — used when the affected joint falls outside the standard lateralized site list (shoulder through ankle/foot).
Arthritis affecting multiple anatomical sites that falls under a specified type but does not fit any more precisely defined ICD-10-CM category — used when the arthritis type is documented but no single-site or disease-specific code applies.
Inclusion & exclusion notes
Includes
- Allergic arthritis
Excludes 1 (mutually exclusive — never code together)
- osteoarthritis (M15-M19)