ICD-9-CM Vol. 1 Diagnostic Codes →
11. COMPLICATIONS OF PREGNANCY, CHILDBIRTH, AND THE PUERPERIUM (630-679) →
section notes
COMPLICATIONS MAINLY RELATED TO PREGNANCY (640-649) →
section notes
644 Early or threatened labor →
section notes
644.00‑644.03   644.0 Threatened premature labor
644.10‑644.13   644.1 Other threatened labor
644.20‑644.21   644.2 Early onset of delivery
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