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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Injury And Poisoning 800-999 > Sprains And Strains Of Joints And Adjacent Muscles 840-848 > Sprains And Strains Of Other And Unspecified Parts Of Back 847.* > 2007 ICD-9-CM Diagnosis 847.4 Sprain of coccyx  On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date. The 2009 version of ICD-9-CM 847.4 can be accessed here. 847.4 is a specific code that can be used to specify a diagnosis 847.4 contains 2 index entries View the ICD-9-CM Volume 1 847.* hierarchy Index entries containing 847.4: Sprain, strain (joint) (ligament) (muscle) (tendon) 848.9 coccyx 847.4 spine 847.9 coccyx 847.4