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V23.2 vs 646.3x


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Hi All.

I am hoping for a definitive answer regarding when it is appropriate to use each of these codes.

I know that 646.3x is used when the patient is pregnant and has had 3 or more consecutive sAb's. That is not a problem. Which code is supposed to be used, though, if the patient has had one or two sAb's or non-consecutive sAb's? Faye Brown specifically says that V23.2 is not to be used for current pregnancy (which makes no sense to me, either. Can someone explain?) So then should I be looking at V23.49?

Any guidance and references on this subject would be greatly appreciated. :D




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I don't know who Faye Brown is, but ICD-9 states V23.2 is 'preg w/ hx of AB', which means current pregnancy; and further describes the code as 'pregnancy w/ h/o conditions classifiable to 634-638'. I use this in a case like you describe, a history of SAB but not as many as 3 consecutive.