15. “With”
The word “with” or “in” should be interpreted to mean “associated with” or
“due to” when it appears in a code title, the Alphabetic Index (either under a
main term or subterm), or an instructional note in the Tabular List. The
classification presumes a causal relationship between the two conditions linked
by these terms in the Alphabetic Index or Tabular List. These conditions
should be coded as related even in the absence of provider documentation
explicitly linking them, unless the documentation clearly states the conditions
are unrelated [/B]or when another guideline exists that specifically requires a
documented linkage between two conditions (e.g., sepsis guideline for “acute
organ dysfunction that is not clearly associated with the sepsis”).

– I have a case, the patient has vitamin b12 deficiency, and dementia. Dr. does not document a causal relationship. However, in the alphabetic index of ICD-10 under term dementia, subterm "in", Vitamin B12 deficiency is listed. According to the above mentioned guideline, should i report E53.8, and F02.80?

Please Help, Thank You.