S66.301
Unspecified injury of extensor muscle, fascia and tendon of left index finger at wrist and hand level
Not billable — category only FY2026 2025-10-01 → 2026-09-30
This is the unspecified option. 9 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
Alongside this code 9 same parent — S66.30
S66.300 Unsp inj extensor musc/fasc/tend r idx fngr at wrs/hnd lv category S66.302 Unsp inj extensor musc/fasc/tend r mid finger at wrs/hnd lv category S66.303 Unsp inj extensor musc/fasc/tend l mid finger at wrs/hnd lv category S66.304 Unsp inj extensor musc/fasc/tend r rng fngr at wrs/hnd lv category S66.305 Unsp inj extensor musc/fasc/tend l rng fngr at wrs/hnd lv category S66.306 Unsp inj extn musc/fasc/tend r little finger at wrs/hnd lv category S66.307 Unsp inj extn musc/fasc/tend l little finger at wrs/hnd lv category S66.308 Unsp injury of extensor musc/fasc/tend finger at wrs/hnd lv category S66.309 Unsp inj extensor musc/fasc/tend unsp finger at wrs/hnd lv category
Subordinate codes 3
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.