FY2027
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Excludes1 pair

I12- vs I15.1

I12 and I15.1 are not coded together. ICD-10-CM declares them mutually exclusive with an Excludes1 note — the two conditions are not expected to occur together, so exactly one of them is normally correct for a given encounter. The Official Guidelines carve out one exception: if the two conditions are clearly unrelated to each other, both may be reported.

The official note, declared on I12
hypertension due to kidney disease (I15.0, I15.1)
I12

Hypertensive chronic kidney disease

Not billable
Chapter 9
Diseases of the circulatory system
Section
I10-I1A
Use when the record says
  • any condition in N18 and N26 - due to hypertension
  • arteriosclerosis of kidney
  • arteriosclerotic nephritis (chronic) (interstitial)
  • hypertensive nephropathy
  • nephrosclerosis
I15.1

Hypertension secondary to other renal disorders

Billable
Chapter 9
Diseases of the circulatory system
Section
I10-I1A
Indexed under
  • Hypertension, hypertensive › due to › renal disorders NEC
  • Hypertension, hypertensive › secondary NEC › due to › renal disorders NEC

Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027