ICD -10 Guidelines


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Can anyone help me how to trace or read this in ICD 10 guidelines: What does this mean?

(I.C.9.a.2) - is this numbers and letters a guide on where to find the guidelines in ICD-10?

Your help is greatly appreciated.
That is a specific section of the guidelines where can go for that specific piece of information .
I.c.9.a.2 is
Section I Conventions, general guidelines and chapter specific guidelines
C Chapter specific guidelines
9 chapter 9 diseases of the circulatory system
a hypertension
2 Hypertensive Chronic Kidney Disease
Assign codes from category I12, Hypertensive chronic kidney disease, when both hypertension and a condition classifiable to category N18, Chronic kidney disease (CKD), are present. CKD should not be coded as hypertensive if the physician has specifically documented a different cause.
The appropriate code from category N18 should be used as a secondary code with a code from category I12 to identify the stage of chronic kidney disease.
See Section I.C.14. Chronic kidney disease.
If a patient has hypertensive chronic kidney disease and acute renal failure, an additional code for the acute renal failure is required.