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
642 Hypertension complicating pregnancy, childbirth, and the puerperium →
section notes
642.2 Other pre-existing hypertension complicating pregnancy, childbirth, and the puerperium →
section notes
642.20   Old hyperten preg-unspec
642.21   Old hyperten NEC-deliver
642.22   Old hyperten-deliv w p/p
642.23   Old hyperten NEC-antepar
642.24   Old hyperten NEC-postpar
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