S66
Injury of muscle, fascia and tendon at wrist and hand level
Choose the additional character
S66 needs more characters to be billable. Pick the specific code below.
- S66.0Injury of long flexor muscle, fascia and tendon of thumb at wrist and hand levelMore levels
- S66.1Injury of flexor muscle, fascia and tendon of other and unspecified finger at wrist and hand levelMore levels
- S66.2Injury of extensor muscle, fascia and tendon of thumb at wrist and hand levelMore levels
- S66.3Injury of extensor muscle, fascia and tendon of other and unspecified finger at wrist and hand levelMore levels
- S66.4Injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand levelMore levels
- S66.5Injury of intrinsic muscle, fascia and tendon of other and unspecified finger at wrist and hand levelMore levels
- S66.8Injury of other specified muscles, fascia and tendons at wrist and hand levelMore levels
- S66.9Injury of unspecified muscle, fascia and tendon at wrist and hand levelMore levels
This code does not map to a risk-adjusting HCC in the loaded models.
Coding notes
Excludes 1 never coded together · Excludes 2 may co-exist
code to identify any retained foreign body, if applicable (Z18.-)
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. (T07-T88) Injury, poisoning and certain other consequences of external causes (T07-T88) (T20-T32) Burns and corrosions (T20-T32) Includes: burns (thermal) from electrical heating appliances burns (thermal) from electricity burns (thermal) from flame burns (thermal) from friction burns (thermal) from hot air and hot gases burns (thermal) from hot objects burns (thermal) from lightning burns (thermal) from radiation chemical burn [corrosion] (external) (internal) scalds Excludes2: erythema [dermatitis] ab igne (L59.0) radiation-related disorders of the skin and subcutaneous tissue (L55-L59) sunburn (L55.-)
Official Guidelines for S66
FY 2026 ›Subsections
- I.C.19.aApplication of 7th Characters in Chapter 19
- I.C.19.bCoding of Injuries
- I.C.19.cCoding of Traumatic Fractures
- I.C.19.dCoding of Burns and Corrosions
- I.C.19.eAdverse Effects, Poisoning, Underdosing and Toxic Effects
- I.C.19.fAdult and child abuse, neglect and other maltreatment
- I.C.19.gComplications of care
Sections that reference S66
Sections whose FY 2026 text names S66, its S66 category, or a range containing it — the chapter guidance above is the authoritative source.