I disagree with your general statement that the index does not necessarily guide us to the correct code. In your example, the index for Low, Hemoglobin guides us to code 285.9. In the tabular 285.9 states Anemia, unspecified. According to Merriman-Webster's Medical Dictionary (Revised edition 2005), the definition of anemia is:
Originally Posted by mitchellde
a condition in which the blood is deficient in red blood cells, in hemoglobin, or in total volumeTherefore, it is correct that unspecified anemia is a condition of blood with deficient (low/hypo) hemoglobin and the 285.9 code would be used.
Your understanding that not all conditions of "hypo" or "hyper", "low" or "deficient" will guide to another condition's code is correct such as elevated (or high) blood pressure would not map from index to tabular to the same code as hypertension. But when the index does guide us, it is correct to use it.
I stand by my first posting in which I said that when a physician states "stable", he/she is addressing the status of a CURRENT condition and should be coded as such. If he/she states "resolved", there is no evidence of that condition being present and therefore a Vcode is applicable. It is important to note that hypo blood sugar mapped us to hypoglycemia NOT diabetes.