Answer: Don't use 57800* (Dilation of cervical canal, instrumental [separate procedure]). It does not sufficiently describe the procedure the ob-gyn performed because it portrays only half of the work. Instead, you should use 58120 (Dilation and curettage, diagnostic and/or therapeutic [nonobstetrical]) to show more clearly what the physician did.
Although 285.1 (Acute posthemorrhagic anemia) may be an appropriate diagnosis code, 626.8 (Disorders of menstruation and other abnormal bleeding from female genital tract; other) probably is not specific enough for this example. Instead, you should use 626.2 (Excessive or frequent menstruation). If the bleeding is bad enough for the ob-gyn to take the patient to the operating room, it likely is excessive.