How could we code without knowing the weeks of pregnancy? I would definitely quiry the Physician before assigning the code,
because there are different codes for weeks of pregnancy- with FETAL AND MATERNAL STRUCTURAL EVALUATION IN ONE CODE,
WHICH COULD OBVIOUSLY INCLUDE THE ANATOMICAL STRUCTURE OF THE MATERNAL PELVIC ORGANS.
Well, your scenario looks like more for maternal anatomical structural evaluation only..; being a pregnant uterus it is needless to say that it goes with evaluation of the fetus also.
If it is below 14weeks pregancy, i would go for 76801/ + 76802.
If it is 14weeks above, 76805/ + 76810.
[ In a retrospective review assessing the risk of torsion among pregnant patients with adnexal tumors > 4 cm, 51% of torsions occurred in tumors measuring 6 to 8 cm in diameter with an overall incidence of 22% in this group of patients. Furthermore, the highest hazard rate of torsion occurred between 15 and 16 weeks' gestation with 60% of torsions occurring between 10 and 17 weeks' [18]. ]
That is one of the reason I wished to know the period of pregnancy, to assign the code.
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Within the two codes you suggested, for the emergency nonobstetrical cause to be ruled out:
The code 76815 go for limited US-limited with respect to fetal and placental. It does not mention/specify about maternal structural evaluation. So I would stay away from this code.
If the doctor's documentation is as "limted and for ovarian pathology for assessment AND didi not mention about any details of the fetal examination , then
the code 76857 limited can be given a merit for the non committal route but as 'pelvic US" for a "suspected non ostetrical condition" as a quick look limited assessment of the pelvic organs like ovaries,paraovarian, adenexal or tubal pathology. Why not?
It says (eg) follicles but can include any structure on the way, within the area of assessment.
The description "limited and nonobsterical cause" , is all that is important here I feel to assign the code, with the avaialble info.
BUT above all, better try to assign acode, getting more details of the pregnancy and the diagnosis.
Thank you .i hope this is just a note to help.