2026 ICD-10-CM Diagnosis Code N18.9Chronic kidney disease, unspecified

AHRQ’s CCSR groups this code into broader clinical categories.

• Hyperphosphatemia

  a condition of abnormally high level of phosphates in the blood, usually significantly above the normal range of 0.84-1.58 mmol per liter of serum.

• Drug Resistance

  diminished or failed response of an organism, disease or tissue to the intended effectiveness of a chemical or drug. it should be differentiated from drug tolerance which is the progressive diminution of the susceptibility of a human or animal to the effects of a drug, as a result of continued administration.

• Drug Resistance, Bacterial

  the ability of bacteria to resist or to become tolerant to chemotherapeutic agents, antimicrobial agents, or antibiotics. this resistance may be acquired through gene mutation or foreign dna in transmissible plasmids (r factors).

• Drug Resistance, Fungal

  the ability of fungi to resist or to become tolerant to chemotherapeutic agents, antifungal agents, or antibiotics. this resistance may be acquired through gene mutation.

• Drug Resistance, Microbial

  the ability of microorganisms, especially bacteria, to resist or to become tolerant to chemotherapeutic agents, antimicrobial agents, or antibiotics. this resistance may be acquired through gene mutation or foreign dna in transmissible plasmids (r factors).

• Drug Resistance, Multiple

  simultaneous resistance to several structurally and functionally distinct drugs.

• Drug Resistance, Multiple, Bacterial

  the ability of bacteria to resist or to become tolerant to several structurally and functionally distinct drugs simultaneously. this resistance may be acquired through gene mutation or foreign dna in transmissible plasmids (r factors).

• Drug Resistance, Multiple, Fungal

  the ability of fungi to resist or to become tolerant to several structurally and functionally distinct drugs simultaneously. this resistance phenotype may be attributed to multiple gene mutations.

• Drug Resistance, Multiple, Viral

  the ability of viruses to resist or to become tolerant to several structurally and functionally distinct drugs simultaneously. this resistance phenotype may be attributed to multiple gene mutation.

• Drug Resistance, Neoplasm

  resistance or diminished response of a neoplasm to an antineoplastic agent in humans, animals, or cell or tissue cultures.

• Drug Resistance, Viral

  the ability of viruses to resist or to become tolerant to chemotherapeutic agents or antiviral agents. this resistance is acquired through gene mutation.

• Nephrosclerosis

  hardening of the kidney due to infiltration by fibrous connective tissue (fibrosis), usually caused by renovascular diseases or chronic hypertension. nephrosclerosis leads to renal ischemia.

• Vitamin D Deficiency

  a nutritional condition produced by a deficiency of vitamin d in the diet, insufficient production of vitamin d in the skin, inadequate absorption of vitamin d from the diet, or abnormal conversion of vitamin d to its bioactive metabolites. it is manifested clinically as rickets in children and osteomalacia in adults. (from cecil textbook of medicine, 19th ed, p1406)

• Acute Kidney Injury

  abrupt reduction in kidney function. acute kidney injury encompasses the entire spectrum of the syndrome including acute kidney failure; acute kidney tubular necrosis; and other less severe conditions.

• Renal Insufficiency

  conditions in which the kidneys perform below the normal level in the ability to remove wastes, concentrate urine, and maintain electrolyte balance; blood pressure; and calcium metabolism. renal insufficiency can be classified by the degree of kidney damage (as measured by the level of proteinuria) and reduction in glomerular filtration rate.

• Renal Insufficiency, Chronic

  conditions in which the kidneys perform below the normal level for more than three months. chronic kidney insufficiency is classified by five stages according to the decline in glomerular filtration rate and the degree of kidney damage (as measured by the level of proteinuria). the most severe form is the end-stage renal disease (chronic kidney failure). (kidney foundation: kidney disease outcome quality initiative, 2002)

• Phosphates

  inorganic salts of phosphoric acid.

• Drug Tolerance

  progressive diminution of the susceptibility of a human or animal to the effects of a drug, resulting from its continued administration. it should be differentiated from drug resistance wherein an organism, disease, or tissue fails to respond to the intended effectiveness of a chemical or drug. it should also be differentiated from maximum tolerated dose and no-observed-adverse-effect level.

• Chronic Toxic Polyneuropathy

  neuropathy affecting multiple nerves that is caused by prolonged exposure to toxic substances.

• Chronic Kidney Disease due to Hypertension

  longstanding kidney disease as a complication of hypertension.

• Uremic Neuropathy

  neuropathy resulting from uremia.

• Grade 1 Hyperphosphatemia, CTCAE|Grade 1 Hyperphosphatemia

  laboratory finding only and intervention not indicated

• Grade 2 Hyperphosphatemia, CTCAE|Grade 2 Hyperphosphatemia

  noninvasive intervention indicated

• Grade 3 Hyperphosphatemia, CTCAE|Grade 3 Hyperphosphatemia

  severe or medically significant but not immediately life-threatening; hospitalization or prolongation of existing hospitalization indicated

• Grade 4 Hyperphosphatemia, CTCAE|Grade 4 Hyperphosphatemia

  life-threatening consequences; urgent intervention indicated (e.g., dialysis)

• Grade 5 Hyperphosphatemia, CTCAE|Grade 5 Hyperphosphatemia

  death

• Hyperphosphatemia

  abnormally high level of phosphate in the blood.

• Hyperphosphatemia, CTCAE|Hyperphosphatemia

  a disorder characterized by laboratory test results that indicate an elevation in the concentration of phosphate in a blood.

• Renal Hypertension

  hypertension caused by narrowing or occlusion of the renal arteries.

• Nutritional Vitamin D Deficiency Rickets

  nutritional rickets due to dietary deficiency of vitamin d.

• Vitamin D Deficiency

  abnormally low level of 25-hydroxyvitamin d in the blood.

• Cardiorenal Syndrome

  a disorder of the heart and kidneys in which dysfunction of one of the organs induces dysfunction of the other organ.

• Toxic Polyneuropathy

  polyneuropathy that is caused by exposure to toxins.

Chronic Kidney Disease

You have two kidneys, each about the size of your fist. Their main job is to filter your blood. They remove wastes and extra water, which become urine. They also keep the body's chemicals balanced, help control blood pressure, and make hormones.

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