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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Complications Of Pregnancy, Childbirth, And The Puerperium 630-677 > Complications Mainly Related To Pregnancy 640-649 > ICD-9-CM Diagnosis 644 Early or threatened labor 644 is a non-specific code that cannot be used to specify a diagnosis ICD-9-CM Diagnosis 644.0 Threatened premature labor 644.0 is a non-specific code that cannot be used to specify a diagnosis 644.0 contains 6 index entries ICD-9-CM Diagnosis 644.00 Threatened premature labor unspecified as to episode of care 644.00 is a specific code that can be used to specify a diagnosis ICD-9-CM Diagnosis 644.03 Threatened premature labor antepartum 644.03 is a specific code that can be used to specify a diagnosis ICD-9-CM Diagnosis 644.1 Other threatened labor 644.1 is a non-specific code that cannot be used to specify a diagnosis 644.1 contains 16 index entries ICD-9-CM Diagnosis 644.10 Other threatened labor unspecified as to episode of care 644.10 is a specific code that can be used to specify a diagnosis ICD-9-CM Diagnosis 644.13 Other threatened labor antepartum 644.13 is a specific code that can be used to specify a diagnosis ICD-9-CM Diagnosis 644.2 Early onset of delivery CHILDBIRTH before 37 weeks of PREGNANCY (259 days from the first day of the mother's last menstrual period, or 245 days after FERTILIZATION). 644.2 is a non-specific code that cannot be used to specify a diagnosis 644.2 contains 11 index entries ICD-9-CM Diagnosis 644.20 Early onset of delivery unspecified as to episode of care 644.20 is a specific code that can be used to specify a diagnosis ICD-9-CM Diagnosis 644.21 Early onset of delivery delivered with or without antepartum condition 644.21 is a specific code that can be used to specify a diagnosis