Question regarding negative result Microbiology Culture

Wappingers Falls, NY
Best answers
I just started billing for microbiology cultures for the practice. Currently we are billing positive cultures as follows:
Urine - 87077, 87186, and 87187 (if additional sensitivities are done)
Rectal swab - 87045, 87077, and 87186

I was wondering, is there a code for when the urine and rectal swab cultures are negative, or is this something that is not billable because it was a negative result? Currently our group is not billing for a negative culture.

I saw in an AHIMA blog that we should be billing 87086 even when there is no growth. What are your thoughts on this?

As for the rectal swab, I saw on the supercoder site that we should bill for all services regardless if there is a positive or negative result. Currently we are not billing for negative results of rectal swabs. Thoughts on this as well please.

I appreciate any and all assistance with this.
Jennifer Murphy, CPC