CCDS Acute Kidney Injury and Renal Documentation

Question 1

According to KDIGO criteria, Stage 1 AKI is defined as an increase in serum creatinine of at least how much within 48 hours?

Accepted Answer

0.3 mg/dL

Answer

KDIGO defines Stage 1 AKI as a serum creatinine increase of ≥0.3 mg/dL within 48 hours or ≥1.5 times the patient's baseline within 7 days.

Question 2

Which ICD-10-CM code for acute kidney injury is classified as a Major Complication or Comorbidity (MCC)?

Accepted Answer

N17.0 - Acute kidney failure with tubular necrosis

Answer

N17.0 (acute kidney failure with tubular necrosis) is classified as an MCC, while N17.9 (unspecified AKI) is only a CC, making specificity critical for MS-DRG impact.

Question 3

According to KDIGO urine output criteria, which finding is consistent with Stage 2 AKI?

Accepted Answer

Less than 0.5 mL/kg/hr for more than 12 hours

Answer

KDIGO Stage 2 AKI by urine output is defined as less than 0.5 mL/kg/hr for more than 12 consecutive hours.

Question 4

When a patient has both acute kidney injury and underlying chronic kidney disease documented, what is the correct ICD-10-CM coding approach?

Accepted Answer

Assign codes for both AKI and CKD to capture the complete clinical picture

Answer

ICD-10-CM guidelines instruct coders to assign separate codes for both AKI (N17.x) and CKD (N18.x) when both conditions are present and documented.

Question 5

Which clinical indicator would most support a CDI query for acute kidney injury in a hospitalized patient?

Accepted Answer

Serum creatinine rise of 0.4 mg/dL above baseline within 36 hours

Answer

A creatinine increase of 0.4 mg/dL above baseline within 36 hours exceeds the KDIGO Stage 1 threshold of ≥0.3 mg/dL within 48 hours, supporting an AKI query.

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CCDS Acute Kidney Injury and Renal Documentation