ICD-10 Code for Monoarthritis
The ICD-10-CM code for monoarthritis is M13.10 — Monoarthritis, not elsewhere classified, unspecified site. This is the code the Alphabetic Index gives for monoarthritis with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
M13.10 is billable but unspecified. If the documentation names a type, site or cause, one of the more specific codes below is likely expected.
Which monoarthritis code should you use?
The Alphabetic Index lists 8 codes under Monoarthritis. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.
By type
| ankle | M13.17Not billable | Monoarthritis, not elsewhere classified, ankle and foot |
| elbow | M13.12Not billable | Monoarthritis, not elsewhere classified, elbow |
| foot joint | M13.17Not billable | Monoarthritis, not elsewhere classified, ankle and foot |
| hand joint | M13.14Not billable | Monoarthritis, not elsewhere classified, hand |
| hip | M13.15Not billable | Monoarthritis, not elsewhere classified, hip |
| knee | M13.16Not billable | Monoarthritis, not elsewhere classified, knee |
| shoulder | M13.11Not billable | Monoarthritis, not elsewhere classified, shoulder |
| wrist | M13.13Not billable | Monoarthritis, not elsewhere classified, wrist |
Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources