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Nicomachus (Greek: Νικόμαχος) was a Macedonian of humble birth, brother of Cebalinus and eromenos of Dimnus, whose "conspiracy" set the stage for the so-called Philotas affair. Curtius calls him exoletus (6.7.2, 8) and scortum (6.7.33). It appears that Nicomachus himself escaped punishment.
References
Who's who in the age of Alexander the Great: prosopography of Alexander's empire by Waldemar Heckel, ISBN978-1-4051-1210-9