Table S6.
Diagnosis codes for preterm labor and delivery
| Diagnosis | Code | Description |
|---|---|---|
| ICD-9-CM | 644.0a | Threatened premature labor |
| 644.00 | Threatened premature labor, unspecified as to episode of care or not applicable | |
| 644.03 | Threatened premature labor, antepartum condition or complication | |
| 644.1a | Other threatened labor | |
| 644.10 | Other threatened labor, unspecified as to episode of care or not applicable | |
| 644.13 | Other threatened labor, antepartum condition or complication | |
| 644.2a | Early onset of delivery | |
| 644.20 | Early onset of delivery, unspecified as to episode of care or not applicable | |
| 644.21 | Early onset of delivery, delivered, with or without mention of antepartum condition | |
| ICD-10-CM | O47.00 | False labor before 37 completed weeks of gestation, unspecified trimester |
| O47.02 | False labor before 37 completed weeks of gestation, second trimester | |
| O47.03 | False labor before 37 completed weeks of gestation, third trimester | |
| O47.1 | False labor at or after 37 completed weeks of gestation | |
| O47.9 | False labor, unspecified | |
| O60.0a | Preterm labor | |
| O60.00 | Preterm labor without delivery, unspecified trimester | |
| O60.02 | Preterm labor without delivery, second trimester | |
| O60.03 | Preterm labor without delivery, third trimester | |
| O60.1a | Preterm labor with preterm delivery | |
| O60.10×0 | Preterm labor with preterm delivery, unspecified trimester, not applicable or unspecified | |
| O60.12×0 | Preterm labor second trimester with preterm delivery second trimester, not applicable or unspecified | |
| O60.13×0 | Preterm labor second trimester with preterm delivery third trimester, not applicable or unspecified | |
| O60.14×0 | Preterm labor third trimester with preterm delivery third trimester, not applicable or unspecified | |
| O60.2a | Term delivery with preterm labor |
Notes:
a
The birth of an infant less than 37 weeks for the gestational age.
Abbreviation: ICD-9/10-CM, International Classification of Disease, Ninth or Tenth Revision, Clinical Modification.