S63.641A (Sprain of metacarpophalangeal joint of right thumb, initial encounter) compared with S63.649A (Sprain of metacarpophalangeal joint of unspecified thumb, initial encounter), from the official CMS tabular data. S63.641A and S63.649A 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. S63.641A and S63.649A 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.
| S63.641ASprain of metacarpophalangeal joint of right thumb, initial encounter | S63.649ASprain of metacarpophalangeal joint of unspecified thumb, initial encounter | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | S00-T88 — Injury, poisoning and certain other consequences of external causes | S00-T88 — Injury, poisoning and certain other consequences of external causes |
| Definition | Sprain of metacarpophalangeal joint of right thumb, initial encounter is a billable ICD-10-CM diagnosis code (S63.641A). | Sprain of metacarpophalangeal joint of unspecified thumb, initial encounter is a billable ICD-10-CM diagnosis code (S63.649A). |
| 7th character | The appropriate 7th character is to be added to each code from category S63 | The appropriate 7th character is to be added to each code from category S63 |
| Includes | avulsion of joint or ligament at wrist and hand level laceration of cartilage, joint or ligament at wrist and hand level sprain of cartilage, joint or ligament at wrist and hand level traumatic hemarthrosis of joint or ligament at wrist and hand level | avulsion of joint or ligament at wrist and hand level laceration of cartilage, joint or ligament at wrist and hand level sprain of cartilage, joint or ligament at wrist and hand level traumatic hemarthrosis of joint or ligament at wrist and hand level |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources