2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Genitourinary System 580-629 > Disorders Of Breast 610-611 > Benign Mammary Dysplasias 610.* > 2006 ICD-9-CM Diagnosis 610.4 Mammary duct ectasia View the most recent version of ICD-9-CM 610.4 Dilatation of the mammary duct without atypical cells. 610.4 is a specific code that can be used to specify a diagnosis 610.4 contains 9 index entries View the ICD-9-CM Volume 1 610.* hierarchy Alternate Terminology Comedomastitis Duct ectasia Mastitis: periductal plasma cell  Index entries containing 610.4: Comedomastitis 610.4 Cyst (mucus) (retention) (serous) (simple) breast (benign) (blue dome) (pedunculated) (solitary) (traumatic) 610.0 involution 610.4 Dilatation duct, mammary 610.4 mammary duct 610.4 Ectasia, ectasis breast 610.4 duct (mammary) 610.4 mammary duct (gland) 610.4 Mastitis (acute) (adolescent) (diffuse) (interstitial) (lobular) (nonpuerperal) (nonsuppurative) (parenchymatous) (phlegmonous) (simple) (subacute) (suppurative) 611.0 periductal 610.4 plasma cell 610.4