S66.322
Laceration of extensor muscle, fascia and tendon of right middle finger at wrist and hand level
S66.322 is a non-billable ICD-10-CM code header for laceration of extensor muscle, fascia and tendon of right middle finger at wrist and hand level. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. A 7th character is required to complete the code. Its coding notes include a Use additional code instruction, a Code also instruction and 7 Excludes2 entries.
7th character
Category S66 requires a 7th character.
Guidelines tips
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
The 7th character depends on whether the patient is in active treatment, not on who sees the patient. An aftercare Z code is not used for injury aftercare.
Each injury gets its own code unless a combination code exists, with the most serious injury first. Superficial injuries at the same site as a more severe injury are not coded. Injuries during medical care are coded as complications.
Use additional code
Add the listed code as a secondary code, if known.
Also from chapter/block level (1 note)
- code to identify any retained foreign body, if applicable (Z18.-)
Code also
Two codes may be needed to describe the condition. This note gives no sequencing order.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
- Injury of extensor muscle, fascia and tendon of thumb at wrist and hand level (S66.2-)
- sprain of joints and ligaments of wrist and hand (S63.-)
Also from chapter/block level (5 notes)
- birth trauma (P10-P15)
- obstetric trauma (O70-O71)
Notes
Also from chapter/block level (2 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.
7th-character codes under S66.322 3
- S66.322ALaceration of extensor muscle, fascia and tendon of right middle finger at wrist and hand level, initial encounterBillable
- S66.322DLaceration of extensor muscle, fascia and tendon of right middle finger at wrist and hand level, subsequent encounterBillable
- S66.322SLaceration of extensor muscle, fascia and tendon of right middle finger at wrist and hand level, sequelaBillable