Sprain of metacarpophalangeal joint of unspecified thumb

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

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.

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

• avulsion of joint or ligament at wrist and hand level
• laceration of cartilage, joint or ligament at wrist and hand level
• sprain of cartilage, joint or ligament at wrist and hand level
• traumatic hemarthrosis of joint or ligament at wrist and hand level
• traumatic rupture of joint or ligament at wrist and hand level
• traumatic subluxation of joint or ligament at wrist and hand level
• traumatic tear of joint or ligament at wrist and hand level

strain of muscle, fascia and tendon of wrist and hand (S66.-)

any associated open wound

The appropriate 7th character is to be added to each code from category S63

traumatic rupture of ligament of finger at metacarpophalangeal and interphalangeal joint(s) (S63.4-)