[800-829] Fractures.
[800-804] Fracture of skull.
[805-809] Fracture of neck and trunk.
[810-819] Fracture of upper limb.
[820-829] Fracture of lower limb.
[830-839] Dislocation.
[840-848] Sprains and strains of joints and adjacent muscles.
[850-854] Intracranial injury, excluding those with skull fracture.
[860-869] Internal injury of thorax, abdomen, and pelvis.
[870-897] Open wound o.
[900-904] Injury to blood vessels.
[905-909] Late effects of injuries, poisonings, toxic effects, and other external causes.
[910-919] Superficial injury.
[920-924] Contusion with intact skin surface.
[925-929] Crushing injury.
[930-939] Effects of foreign body entering through orifice.
[940-949] Burns.
[950-957] Injury to nerves and spinal cord.
[958-959] Certain traumatic complications and unspecified injuries.
[960-979] Poisoning by drugs, medicinal and biological substances.
[980-989] Toxic effects of substances chiefly non-medicinal as to source.
[990-995] Other and unspecified effects of external causes.
[996-999] Complications of surgical and medical care, not elsewhere classified.
Quite simple and informative elaboration!
I am not that familiar with all the details medical billing and coding but I believe learning it's basic would be a great help in dealing with medical issues on finances.