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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Skin And Subcutaneous Tissue 680-709 > Infections Of Skin And Subcutaneous Tissue 680-686 > ICD-9-CM Diagnosis 685 Pilonidal cyst A hair-containing cyst or sinus, occurring chiefly in the coccygeal region. 685 is a non-specific code that cannot be used to specify a diagnosis ICD-9-CM Diagnosis 685.0 Pilonidal cyst with abscess 685.0 is a specific code that can be used to specify a diagnosis 685.0 contains 15 index entries ICD-9-CM Diagnosis 685.1 Pilonidal cyst without abscess 685.1 is a specific code that can be used to specify a diagnosis 685.1 contains 14 index entries