O21.2Late vomiting of pregnancy - Excessive vomiting starting after 20 completed weeks of gestation
Be sure to look for coding notes. "Use additional code," for example, requires you report a code from I15- to identify the type of secondary hypertension. If the patient has pre-existing diabetes mellitus, identify any insulin use (Z79.4). Do not use this code if the patient has gestational diabetes, as this code is for long-term use.
Take a look at another example of a pre-existing condition and the notes associated with this code:
O34.41 Maternal care for other abnormalities of cervix, first trimester
Includes: the listed conditions as a reason for hospitalization or other obstetric care of the mother, or for cesarean delivery before onset of labor
Code First: any associated obstructed labor (O65.5)
Use additional code for specific condition
These instructions are not optional. They must be included in your documentation and coding to ensure proper reimbursement.
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