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S66.121Non-billableSave

S66.121 - Laceration of flexor muscle, fascia and tendon of left index finger at wrist and hand level

ICD-10-CM Chapter 19: Injury, poisoning and certain other consequences of external causes · S60-S69 Injuries to the wrist, hand and fingers (S60-S69) · Subcategory of S66.12 · FY2027

Coding Guidance

S66.121 requires a 7th character. Report the code below that matches the documentation, for example A for initial encounter, D for subsequent encounter, S for sequela.

7th Character

The appropriate 7th character is to be added to each code from category S66

Includes, Excludes and Coding Notes

Excludes 2 — Not Included HereFrom S66.1

Not part of this code; report both codes when the patient has both conditions.

  • Injury of long flexor muscle, fascia and tendon of thumb at wrist and hand level (S66.0-)
Excludes 2 — Not Included HereFrom S66

Not part of this code; report both codes when the patient has both conditions.

  • sprain of joints and ligaments of wrist and hand (S63.-)
Code AlsoFrom S66

Report an additional code when both conditions apply.

  • any associated open wound (S61.-)
Excludes 2 — Not Included HereFrom S60-S69 Injuries to the wrist, hand and fingers (S60-S69)

Not part of this code; report both codes when the patient has both conditions.

  • burns and corrosions (T20-T32)
  • frostbite (T33-T34)
  • insect bite or sting, venomous (T63.4)
Excludes 2 — Not Included HereFrom Chapter S00-T88

Not part of this code; report both codes when the patient has both conditions.

  • birth trauma (P10-P15)
  • obstetric trauma (O70-O71)
Use Additional CodeFrom Chapter S00-T88

Add a secondary code to identify the associated condition or cause when it is documented.

  • code to identify any retained foreign body, if applicable (Z18.-)
NotesFrom Chapter S00-T88

Instructional notes from the ICD-10-CM tabular list.

  • 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.

More Specific Codes (3)

S66.121ALaceration of flexor muscle, fascia and tendon of left index finger at wrist and hand level, initial encounter→S66.121DLaceration of flexor muscle, fascia and tendon of left index finger at wrist and hand level, subsequent encounter→S66.121SLaceration of flexor muscle, fascia and tendon of left index finger at wrist and hand level, sequela→

Related condition guides

Documentation requirements, coding pitfalls and FAQs for conditions coded with S66.121.