S66.511

Strain of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level

Header / non-billable

Choose the additional character

S66.511 needs more characters to be billable. Pick the specific code below.

S66.511AStrain of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level, initial encounterBillable
S66.511DStrain of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level, subsequent encounterBillable
S66.511SStrain of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level, sequelaBillable

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

Inherited from S66.5Inj intrinsic musc/fasc/tend and unsp finger at wrs/hnd lv

Excludes 2

injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand level (S66.4-)

Inherited from S66Injury of muscle, fascia and tendon at wrist and hand level

Excludes 2

sprain of joints and ligaments of wrist and hand (S63.-)

Code also

any associated open wound (S61.-)

7th character

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

Valid 7th characters and their meanings
Character	Meaning
A	initial encounter
D	subsequent encounter
S	sequela

Inherited from S60-S69Injuries to the wrist, hand and fingers

Excludes 2

burns and corrosions (T20-T32) frostbite (T33-T34) insect bite or sting, venomous (T63.4)

Inherited from chapter 19Injury, poisoning and certain other consequences of external causes

Excludes 2

birth trauma (P10-P15) obstetric trauma (O70-O71)

Use additional

code to identify any retained foreign body, if applicable (Z18.-)

Note

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 S66.511

FY 2026 ›

I.C.19Chapter-specific guidanceChapter 19: Injury, poisoning, and certain other consequences of external causes (S00-T88)

Subsections

Sections that reference S66.511

I.C.19.bCoding of Injuries
… Traumatic injury codes (S00- T14.9) are not to be used for normal, healing surgical wounds or to identify complications of surgical wounds. …

Sections whose FY 2026 text names S66.511, its S66 category, or a range containing it — the chapter guidance above is the authoritative source.