275 When it comes to reporting injuries, International Classification of Diseases, 10th Revision, Clinical Modification (ICD-10-CM) provides specificity that International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) lacked. ICD-10-CM codes for most injuries will be reported with the S codes found in Chapter 19 of the tabular list. Unlike ICD-9-CM, which classified injuries by category of injury, S codes are divided into blocks based on single body regions. Appendix B-22 Sprains and Strains (continued on page 276) S00–S09 Injuries to the head S10–S19 Injuries to the neck S20–S29 Injuries to the thorax S30–S39 Injuries to the abdomen, lower back, lumbar spine, pelvis, and external genitals S40–S49 Injuries to the shoulder and upper arm S50–S59 Injuries to the elbow and forearm S60–S69 Injuries to the wrist, hand, and fingers S70–S79 Injuries to the hip and thigh S80–S89 Injuries to the knee and lower leg S90–S99 Injuries to the ankle and foot Chapter 19 also includes T codes that cover injuries to unspecified body regions as well as poisoning, burns, corrosions, and certain other consequences of external causes. A key change in ICD-10-CM is the differentiation of a sprain of a ligament from a strain of a muscle or tendon. These conditions were reported with a single code by site in ICD-9-CM. Examples For a follow-up visit for a sprain of the calcaneofibular ligament of the right ankle, code as follows: ICD-9-CM 845.02 Sprains and strains of ankle and foot ankle calcaneofibular (ligament) ICD-10-CM S93.411D Sprain of calcaneofibular ligament of right ankle, subsequent encounter For the initial encounter for a strain of extensor digitorum longus of the right foot, code as follows: ICD-9-CM 845.19 Sprains and strains of ankle and foot foot other ICD-10-CM S96.011A Strain of muscle and tendon of long flexor muscle of toe at ankle and foot level, right foot, initial encounter
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