Hi Maggie!
D0415 - collection of microorganisms for culture and sensitivity
I have found some possible coding options, if any of these descriptions fit for the procedure you're performing!
87070 - Culture, bacterial; any other source except urine, blood or stool, aerobic, with isolation and presumptive identification of isolates
87040 - Culture, bacterial; blood, aerobic, with isolation and presumptive identification of isolates (includes anaerobic culture, if appropriate)
87081 - Culture, presumptive, pathogenic organisms, screening only
87084 - Culture, presumptive, pathogenic organisms, screening only; with colony estimation from density chart
87158 - Culture, typing; other methods
87184 - Susceptibility studies, antimicrobial agent; disk method, per plate (12 or fewer agents)
87185 - Susceptibility studies, antimicrobial agent; enzyme detection (eg, beta lactamase), per enzyme
87187 - Susceptibility studies, antimicrobial agent; microdilution or agar dilution, minimum lethal concentration (MLC), each plate (List separately in addition to code for primary procedure)
87188 - Susceptibility studies, antimicrobial agent; macrobroth dilution method, each agent
Hope this helps!