M65.321 (Trigger finger, right index finger) compared with M65.322 (Trigger finger, left index finger), from the official CMS tabular data. M65.321 and M65.322 code the same condition on opposite sides. MedCoder-derived
Same condition; these differ only in which side is documented.
These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.
Source: ICD-10-CM tabular list (laterality variant derived from the code title)
Same condition, opposite side. M65.321 and M65.322 name the same condition on opposite sides of the body.
Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.
| M65.321Trigger finger, right index finger | M65.322Trigger finger, left index finger | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | M00-M99 — Diseases of the musculoskeletal system and connective tissue | M00-M99 — Diseases of the musculoskeletal system and connective tissue |
| Definition | Trigger finger, right index finger is a billable ICD-10-CM diagnosis code (M65.321). | Trigger finger, left index finger is a billable ICD-10-CM diagnosis code (M65.322). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources