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Doctors use abbreviations every day, but patients can feel left out. C/B is one of those terms worth understanding.

The abbreviation C/B stands for “complicated by.” It is commonly used in medical notes, reports, and patient charts. Doctors use it to quickly show that one health condition has led to another problem.
For example, if someone has pneumonia that results in sepsis, the note may read “Pneumonia c/b sepsis.” This way, the main condition and the complication are both clear.
Complications are not rare. In U.S. major surgeries, about 1 in 8 patients had complications afterward. Globally, tens of millions suffer complications from surgery each year. If patients see “c/b” in their records, it signals something that happens often in a medical context.
In practice, this abbreviation helps doctors keep records short while still sharing important details about a patient’s health.
Here are some typical ways C/B appears in healthcare notes:
It’s important to remember that these notes show a complication, not the main diagnosis itself.
If you notice C/B in your medical records, it often points to a complication worth understanding better. It’s especially important to ask questions if:
Alongside C/B, there are several other abbreviations you may notice in medical notes:
Yes, C/B can appear in other contexts. In casual writing or texting, people sometimes use “c/b” to mean “call back.” In business notes, it might mean “cost/benefit.” But in medical records, C/B almost always means “complicated by.” That’s why it’s important to look at the context before assuming its meaning.
Not always. While C/B usually stands for “complicated by,” some hospitals or regions may prefer to write the full phrase. The use of abbreviations depends on local policies, training, and habits. If you see C/B in your notes, it’s safe to ask your doctor exactly what it refers to in your case.
Yes, they can. Abbreviations save time but sometimes create confusion. Studies show that even health workers can misread them if they are not used consistently. For patients, abbreviations may cause stress or misunderstanding. That’s why many hospitals now encourage doctors to write terms in full when possible.
During pregnancy, C/B in notes still means “complicated by.” For example, a record might say “pregnancy c/b gestational diabetes.” This shows that the pregnancy has been affected by another condition. It doesn’t mean the pregnancy is unsafe, but it signals something doctors are monitoring more closely.
The abbreviation B&C usually stands for “biopsy and curettage” or “biopsy and cautery,” depending on the context. Both refer to medical procedures where tissue is removed or treated. Unlike C/B, which is about describing complications, B&C is tied to specific procedures. If you see it in your records, it’s best to confirm which meaning applies.

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