S66.39
Other injury of extensor muscle, fascia and tendon of other and unspecified finger at wrist and hand level
Not billable — category only FY2026 2025-10-01 → 2026-09-30
This is the unspecified option. 3 more
specific codes sit alongside it. Worth
checking whether the documentation supports one of them.
Exclusions 7 never code together
7th character 3
A initial encounter
D subsequent encounter
S sequela
Instructional notes 4
S00-T88chapter
Notes
- Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
- The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.
Use additional code
- code to identify any retained foreign body, if applicable (Z18.-)Z18.-
Index entries leading here 1
- Injury T14.90
- muscle (and fascia) (and tendon)
- finger
- index
- little
- middle
- ring
- finger
- muscle (and fascia) (and tendon)
Alongside this code 3 same parent — S66.3
Subordinate codes 10
S66.390 Inj extensor musc/fasc/tend right index finger at wrs/hnd lv S66.391 Inj extensor musc/fasc/tend left index finger at wrs/hnd lv S66.392 Inj extensor musc/fasc/tend r mid finger at wrs/hnd lv S66.393 Inj extensor musc/fasc/tend left middle finger at wrs/hnd lv S66.394 Inj extensor musc/fasc/tend right ring finger at wrs/hnd lv S66.395 Inj extensor musc/fasc/tend left ring finger at wrs/hnd lv S66.396 Inj extensor musc/fasc/tend r little finger at wrs/hnd lv S66.397 Inj extensor musc/fasc/tend left little finger at wrs/hnd lv S66.398 Inj extensor musc/fasc/tend finger at wrist and hand level S66.399 Inj extensor musc/fasc/tend unsp finger at wrs/hnd lv
Medications 2
2 Chemical and Drug Induced Liver Injury drugs 1 Chemical and Drug Induced Liver Injury, Chronic 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.