Kidney, acute renal failure NOS

ICD10 Diagnosis
Dx:	Kidney, acute renal failure NOS
ICD10 code:	N17.9
Pre-ICD10 counterpart:	ARF, ARI
Charlson/ALERT Scale:	none
APACHE Como Component:	none
APACHE Acute Component:	2019-0: Renal/Metabolic NOS, 2019-0: Metabolic/Renal NOS
Start Date:
Stop Date:
External ICD10 Documentation	ICD-10 CM Wikipedia ICD-10 Wikipedia WHO ICD10 documentation ICD10data.com

This diagnosis is a part of ICD10 collection.

• SMW
  • 2019-01-01
  • 2999-12-31
  • N17.9

• Cargo

• Categories

• SMW

• Cargo

• Categories

• SMW

• Cargo

• Categories

Additional Info

Excludes:

• Kidney, acute tubular necrosis (ATN) - This code Kidney, acute renal failure NOS is, by definition, for acute renal failure that is "not otherwise specified" (NOS). ATN is more specific, so if it is right, use it

Terminology related to Acute Kidney Injury

• Nephrologists want us to use the term Acute Kidney Injury (AKI).
  • The reason is that this entity, whatever it's called, includes the full range of levels of kidney injury from minor all the way up to complete renal shutdown needing dialysis.
• Some other terms for it are:
  • Acute Renal Failure
  • Acute Renal Insufficiency (ARI)

KDIGO Guidelines for Acute Kidney Injury (AKI)

• We use the KDIGO criteria for defining Acute Kidney Injury (AKI, Acute Renal Failure and Acute Renal Insufficiency) (starting January 1, 2019)
• The main thing here is identifying that the observed problem with kidney function is acute, rather than chronic - and THIS is the reason that identifying AKI requires trying to find a past/baseline value of serum creatinine
• The KDIGO guidelines delineate several different "levels/degrees" of AKI. You'll note that (at its lowest level) AKI is present even with pretty small rises in serum creatinine. While one MIGHT think that such small rises are inconsequential, indeed they are not. As indicated in the paper "Small Acute Increases in Serum Creatinine Are Associated with Decreased Long-Term Survival in the Critically Ill", even rises in creatinine of 27 mcg/L in ICU patients are associated with higher rates of death. Thus in this new schema we are not overcounting those with significant AKI, but before we probably were undercounting them.
  • After a patient first developed AKI (as indicated by a rise in creatinine) it may continue to rise at a highly variable rate. The importance of this is that we should NOT re-code an AKI-related code each time the creatinine rises by 27 mcg/L if the continuing rise is simply part of the original event.
  • It is possible, however, for a patient to have multiple AKI events. While this would be indicated by creatinine rising again after it stabilized or fell (without dialysis), it requires a medical judgement to determine whether the re-rising is really part of the initial episode or represents a new AKI episode. There is no firm rule about how long creatinine should cease rising to say the first AKI episode is completed.
• These criteria will apply everywhere we need to identify ARF/AKI -- including:
  • Kidney, acute renal failure NOS
  • ARF (APACHE)
  • Kidney, acute tubular necrosis (ATN)
  • Kidney, acute renal failure, postprocedural
• But NOT for Kidney, renal failure/insufficiency/uremia, unspecified as acute or chronic - since as stated this code is for kidney failure or insufficiency when you don't know whether it's acute or chronic.

• In order to reduce the workload for identifying ARF/AKI, we will implement a first stage screening process to try and filter out the majority of people, who will NOT have AKI/ARF.
  • We expect that this screening will misclassify a few people who do have AKI as not having it, but we also expect that most of those who are missed will continue to experience declining renal function and their AKI/ARF will be identified in the following days.

First stage - screening

• Assume at admission that the patient does NOT have AKI/ARF if ALL of the following are true:
  • (1) Creatinine <110 for males and <90 for females AND
  • (2) No mention in chart of acute kidney/renal problems AND
  • (3) No mention in the chart of oliguria
• The source used for these threshold values of serum creatinine are population-based surveys of serum creatinine in people without known kidney problems:
  • Serum creatinine levels in the US population: third National Health and Nutrition Examination Survey (PubMed)
  • The effect of age on serum creatinine levels in an aging population: relevance to vascular surgery. (PubMed)
• If ANY of 1, 2 or 3 are false, then go on to the full evaluation in the Second Stage

Second stage - Full assessment

• Acute Kidney Injury (AKI) is present if ANY ONE OR MORE of the following are true (these are the KDIGO guidelines):
• (a) Urine output < 0.5 mL/kg/hour for 6 hours
  • so, obviously, you can't make this determination until there has been at least 6 hours of observation of urine output
  • also you need a weight -- if there isn't one already measured you have the following options: Wait for one to be done; Ask the nurse to do one; Do your best to estimate the weight, remembering that if the person appears to be of average size, then you could use default values based on average values in the Canadian population, i.e. 85 kg for men and 70 kg for women
• (b) Increase in serum creatinine by 27 micromoles/L or more within 48 hours
  • so, while this may happen quickly and thus this criterion be met before 48 hrs, you cannot make a full determination that it is NOT true until you have at least 2 serum creatinine values separated by at least 48 hours
  • in the case that the creatinine rises by >27, say in the first 12 hours, but then declines back down so that at the end of 48 hrs the net rise is <27, THEN THIS DOES QUALIFY AS AKI
• (c) Increase in serum creatinine to 1.5 times baseline or more within the last 7 days
  • this criterion is important because since many people have some degree of CHRONIC renal insufficiency or failure, a solitary serum creatinine can't tell you if the high value is acute or chronic
  • thus, to evaluate this criterion, seek a serum creatinine value at least 7 days old -- use whatever is the most recent value more than 7 days old that is available, even if it's years old
  • if there ARE NO values >7 days old, then you can use the sex-specific normal value as follows:
    • Men: 100 micromoles/L
    • Women: 85 micromoles/L

ESRD vs Acute Renal Failure

• Do NOT code both
  • Chronic kidney disease (end-stage renal/kidney disease, ESRD), Stage 5, GFR LT 15

AND

• Any of the acute renal failure diagnoses (Kidney, acute tubular necrosis (ATN), Kidney, acute renal failure NOS, Kidney, renal failure/insufficiency/uremia, unspecified as acute or chronic, Kidney, acute renal failure, postprocedural)

• UNLESS the patient has had a renal transplant and the transplanted kidney was functioning (and thus can experience acute renal failure)

About "Acute on Chronic renal failure"

• Our definition for CRF includes two things, as above. If you are on dialysis then it is technically not possible to also have acute renal failure. And while our threshold of creatinine clearance < 15 ml/min USUALLY gets people on dialysis, that's not always the case. In other words, there are some people who don't need to start dialysis until their clearance is <10 or even 8 ml/min. THOSE people who by our definition have Stage 5 CKD cannot have ARF but rather this is considered a progression of their underlying disease. Instead of coding ARF, code the reason for dialysis ie. Fluid overload, Hyperkalemia, severe or symptomatic etc combined with Chronic kidney disease (end-stage renal/kidney disease, ESRD), Stage 5, GFR LT 15

• And of course, if you previously had Stage 5, were on dialysis, then got a successful renal transplant, then you CAN get acute renal failure in your graft.

Alternate ICD10s to consider coding instead or in addition

Candidate Combined ICD10 codes

• Also code the cause, if known.

Related CCI Codes

Data Integrity Checks

There are a number of coding rules related to renal diagnoses, centralized info about them is in ICD10 Guideline for Renal Coding.

Data Integrity Checks (automatic list)

	App	Status
Can't check ICD10 ARF vs APACHE ARF	CCMDB.accdb	declined
Query check CCI ICD10 Dialysis no Dx	CCMDB.accdb	implemented
Query check_ICD10_ESRD_and_AKI_only_if_transplant	CCMDB.accdb	implemented
Query check ICD10 ESRD vs ARF	CCMDB.accdb	not feasible
Check CRF vs ARF across multiple encounters	Centralized data front end.accdb	declined

Legacy Info

Legacy only

We understand that the definition in the ICD10 codes is different than the definition in ARF (Diagnosis) and ARI and CRF - Chronic Renal Failure was. We are OK with that and will use the new definitions for the new codes, and the old ones for the old codes. Hopefully we can limit the amount of time where we consider both.

Related Articles

Skin	Trauma Abdominal trauma Burn Chemical burn Fracture Head trauma Head trauma (old) Joint/ligament trauma Lower limb trauma Muscles/tendon trauma Neck trauma Potential trauma Thoracic trauma Traumatic Amputation Traumatic fracture Upper limb trauma Vascular trauma	Renal/urinary Chronic kidney disease Nephritic syndrome Renal failure Renal/Urinary neoplasm Urinary tract infection	Infectious disease Antibiotic resistance Bacteria COVID Double duty pathogen Encephalitis Fungus Iatrogenic infection Infection requiring pathogen Infection with implied pathogen Influenza Intra-abdominal infection Lower respiratory tract infection Meningitis Non-specific pathogens Osteomyelitis Pathogens Pneumonia Potential infection Tuberculosis Upper respiratory tract infection Virus
ENT	Testing Imaging	Cardiovascular Aneurysm Aortic Aneurysm Arrhythmia Arterial thromboembolism Atherosclerosis Cardiac septum problem Cerebral Hemorrhage/Stroke Heart valve disease Hemorrhage Hypertension Hypotension Ischemia Ischemic gut Ischemic heart disease Myocardial Infarction Pulmonary embolism Pulmonary hypertension Vasculitis Venous thromboembolism	Hereditary/congenital
Eye	Mechanism Transportation mechanism	Neoplastic Benign neoplasm Endocrine neoplasm Female genital neoplasm Gastrointestinal neoplasm Heme/immunology neoplasm Leukemia Lymphoma Male genital neoplasm Metastasis Musculoskeletal/soft tissue neoplasm Neuro neoplasm Primary malignancy Renal/Urinary neoplasm Respiratory neoplasm Skin neoplasm	Heme/immunology Allergy Anemia Heme/immunology neoplasm Hemophilia Leukemia Thrombocytopenia
Misc Adverse effect Alcohol related Allergy Anesthetic related Antidepressant related Awaiting/delayed transfer COVID Cannabis related Cocaine related Decubitus ulcer Diagnosis implying death Exposure Fistula Hallucinogen related Has one Healthcare contact Hemorrhage Iatrogenic Metabolic/nutrition Non-traumatic fracture Observation Organ removal Ostomy Overdose Paralysis Past medical history Poisoning Psychoactive substance NOS related Radiation related Retired Code Rheumatic disease Sedative related Shock Solvent related Spine Stimulant related Transplant	Reproductive Abortion Breast disease Female genital neoplasm Male genital neoplasm Peripartum	Gastrointestinal Cirrhosis GI ulcer Gastroenteritis Gastrointestinal neoplasm Hepatitis Hernia Inflammatory Bowel Disease Intra-abdominal infection Ischemic gut Liver disease Liver failure Pancreas disease Pancreatitis Peptic ulcer	Musculoskeletal/soft tissue Hernia Joint/ligament trauma Muscle problem Muscles/tendon trauma Musculoskeletal/soft tissue neoplasm Osteomyelitis
Psych Addiction Antidepressant related Delirium Dementia Hallucinogen related Opioid related Psychoactive substance NOS related Sedative related Solvent related Stimulant related Withdrawal	Respiratory Asthma Influenza Inhalation Lower respiratory tract infection Pleural abnormalities Pneumoconiosis Pneumonia Pneumothorax Pulmonary embolism Respiratory neoplasm Sleep disorder Tracheostomy Upper respiratory tract infection	Poisoning Acute intoxication Addiction Opioid related Overdose Poisoning by non-pharmaceuticals Stimulant related Withdrawal
Neuro Cerebral Hemorrhage/Stroke Encephalitis Encephalopathy Meningitis Neuro neoplasm Paralysis	Symptom/Sign Pain	Endocrine disorder Adrenal Insufficiency Diabetes Endocrine neoplasm Metabolic/nutrition

Show all ICD10 Subcategories

ICD10 Categories: ANCA-associated Vasculitis (AAV), Abdominal trauma, Abortion, Acute intoxication, Addiction, Adrenal Insufficiency, Adverse effect, Alcohol related, Allergy, Anemia, Anesthetic related, Aneurysm, Antibiotic resistance, Antidepressant related, Aortic Aneurysm, Arrhythmia, Arterial thromboembolism, Asthma, Atherosclerosis, Awaiting/delayed transfer, Bacteria, Benign neoplasm, Breast disease, Burn, COVID, Cannabis related, Cardiac septum problem, Cardiovascular, Cerebral Hemorrhage/Stroke, Chemical burn, Chronic kidney disease, Cirrhosis, Cocaine related, Decubitus ulcer, Delirium, Dementia, Diabetes, Diagnosis implying death, Double duty pathogen, ENT, Encephalitis, Encephalopathy, Endocrine disorder, Endocrine neoplasm, Exposure, Eye, Female genital neoplasm, Fistula, Fracture, Fungus, GI ulcer, Gastroenteritis, Gastrointestinal, Gastrointestinal neoplasm, Hallucinogen related, Has one, Head trauma, Head trauma (old), Healthcare contact, Heart valve disease, Heme/immunology, Heme/immunology neoplasm, Hemophilia, Hemorrhage, Hepatitis, Hereditary/congenital, Hernia, Hypertension, Hypotension, Iatrogenic, Iatrogenic infection, Iatrogenic mechanism, Imaging, Infection requiring pathogen, Infection with implied pathogen, Infectious disease, Inflammatory Bowel Disease, Influenza, Inhalation, Intra-abdominal infection, Ischemia, Ischemic gut, Ischemic heart disease, Joint/ligament trauma, Leukemia, Liver disease, Liver failure, Lower limb trauma, Lower respiratory tract infection, Lymphoma, Male genital neoplasm, Mechanism, Meningitis, Metabolic/nutrition, Metastasis, Misc, Muscle problem, Muscles/tendon trauma, Musculoskeletal/soft tissue, Musculoskeletal/soft tissue neoplasm... further results