M13.8
Other specified arthritis
Not billable — category only FY2026 2025-10-01 → 2026-09-30
Exclusions 13 never code together
M00-M99chapter
Excludes2
- arthropathic psoriasis (L40.5-)L40.5-
- certain conditions originating in the perinatal period (P04-P96)P04-P96
- certain infectious and parasitic diseases (A00-B99)A00-B99
- compartment syndrome (traumatic) (T79.A-)T79.A-
- complications of pregnancy, childbirth and the puerperium (O00-O9A)O00-O9A
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Q00-Q99
- endocrine, nutritional and metabolic diseases (E00-E88)E00-E88
- injury, poisoning and certain other consequences of external causes (S00-T88)S00-T88
- neoplasms (C00-D49)C00-D49
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)R00-R94
Excludes1 — never code together. The excluded condition and this one are mutually exclusive.
Excludes2 — not included here, but the patient may have both. Code both when documented.
Instructional notes 3
Alongside this code 2 same parent — M13
Subordinate codes 10
M13.80 Other specified arthritis, unspecified site M13.81 Other specified arthritis, shoulder M13.82 Other specified arthritis, elbow M13.83 Other specified arthritis, wrist M13.84 Other specified arthritis, hand M13.85 Other specified arthritis, hip M13.86 Other specified arthritis, knee M13.87 Other specified arthritis, ankle and foot M13.88 Other specified arthritis, other site M13.89 Other specified arthritis, multiple sites
Medications 5
214 Arthritis drugs 130 Arthritis, Rheumatoid drugs 34 Arthritis, Juvenile drugs 34 Arthritis, Psoriatic drugs 26 Arthritis, Gouty drugs
MED-RT files conditions by MeSH, which carves the world differently from ICD-10. These are name matches on this code's description, offered as candidates — not as an assertion that they are this code.
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.