S66.02
Laceration of long flexor muscle, fascia and tendon of thumb at wrist and hand level
S66.02 is a non-billable ICD-10-CM code header for laceration of long flexor muscle, fascia and tendon of thumb 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. The more specific codes under it are S66.021 Laceration of long flexor muscle, fascia and tendon of right thumb at wrist and hand level; S66.022 Laceration of long flexor muscle, fascia and tendon of left thumb at wrist and hand level and S66.029 Laceration of long flexor muscle, fascia and tendon of unspecified thumb at wrist and hand level. Its coding notes include a Use additional code instruction, a Code also instruction and 6 Excludes2 entries.
7th characters
Every code below needs one of these (defined at S66).
The appropriate 7th character is to be added to each code from category S66
- Ainitial encounter
- Dsubsequent encounter
- Ssequela
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.
- 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.
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 1 entry
More specific codes under S66.02 3
- S66.021Laceration of long flexor muscle, fascia and tendon of right thumb at wrist and hand level7th char needed
- S66.022Laceration of long flexor muscle, fascia and tendon of left thumb at wrist and hand level7th char needed
- S66.029Laceration of long flexor muscle, fascia and tendon of unspecified thumb at wrist and hand level7th char needed