M13.10
Monoarthritis, not elsewhere classified, unspecified site
Billable FY2026 2025-10-01 → 2026-09-30
This is the unspecified option. 7 more
specific codes sit alongside it. Worth
checking whether the documentation supports one of them.
Exclusions 12 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 2
Index entries leading here 1
- Monoarthritis M13.10
Alongside this code 7 same parent — M13.1
M13.11 Monoarthritis, not elsewhere classified, shoulder category M13.12 Monoarthritis, not elsewhere classified, elbow category M13.13 Monoarthritis, not elsewhere classified, wrist category M13.14 Monoarthritis, not elsewhere classified, hand category M13.15 Monoarthritis, not elsewhere classified, hip category M13.16 Monoarthritis, not elsewhere classified, knee category M13.17 Monoarthritis, not elsewhere classified, ankle and foot category
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.