Final answer:
A Medical Transcriptionist lacking a strong command of the English language is more likely to make transcription errors, which can result in compromised patient care and increased healthcare costs.
Step-by-step explanation:
One negative effect of a Medical Transcriptionist not having a command of the English language is C) Increased errors in transcription. This can have serious implications in healthcare as transcription errors can lead to incorrect patient records and potentially harmful miscommunications regarding treatments or medication dosages. A high level of proficiency in English is crucial for medical transcriptionists to accurately interpret and transcribe doctors' notes and other audio records. These errors not only compromise patient care but can also lead to legal issues and increased costs due to the need for corrections and additional care resulting from mistakes.