colinephritis

Definition of colinephritis

coli-nephr--itis - Inflammation of kidney, caused by E. coli (kidney inflammation by E.coli) pyelonephritis is a type of urinary tract infection where one or both kidneys become infected. They can be infected by bacteria or a virus. Colinephritis is a highly specific term for a bacterial infection and subsequent inflammation of the kidney (renal parenchyma and renal pelvis) driven by Escherichia coli. Clinically, this almost always presents as acute pyelonephritis. E. coli, a normal resident of the gastrointestinal tract, is the most common uropathogen responsible for ascending urinary tract infections. The bacteria typically colonize the periurethral area, ascend into the bladder (causing cystitis), and then travel up the ureters to invade the kidney. Severe cases can result in systemic bacteremia, renal abscesses, or permanent renal scarring.

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Etymology of colinephritis

colinephritis combines “coli” (E. coli), “nephr-/o” (kidney), and “-itis” (inflammation) to mean E. coli-caused kidney inflammation;

• coli- (from Escherichia coli / Greek kolon): Refers to the specific bacterium, named for its typical habitat in the colon.

• nephr- (νεφρός): Root meaning “kidney.”

• -itis (-ῖτις): Suffix denoting “inflammation.”

• Literal Meaning: “Inflammation of the kidney caused by E. coli.

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Coding & Documentation Nuances

• ICD-10-CM Dual Coding: There is no single, all-encompassing code for colinephritis. The “Use additional code” instruction in the ICD-10 tabular list dictates that two codes are required:

  1. The localized condition: typically N10 (Acute tubulo-interstitial nephritis / Acute pyelonephritis) or N15.9 (Renal tubulo-interstitial disease, unspecified).

  2. The organism: B96.20 (Unspecified Escherichia coli [E. coli] as the cause of diseases classified elsewhere) or a more specific E. coli code if the exact strain is documented.

• Sepsis Guidelines: If the colinephritis leads to sepsis, sequencing rules change. The systemic infection (A41.51, [[Sepsis due to Escherichia coli]] [E. coli]) would generally be sequenced as the principal diagnosis, followed by the localized kidney infection (N10).

Clinical Indicators

To support this diagnosis and the associated dual-coding requirement, coders should look for:

1. Microbiology Reports: A definitive urine culture or blood culture isolating Escherichia coli as the causative organism.

2. Urinalysis (UA): Findings consistent with severe infection, such as significant pyuria (white blood cells), bacteriuria, positive leukocyte esterase, and positive nitrites.

3. Physical Exam: Documentation of systemic signs of kidney infection, notably costovertebral angle (CVA) tenderness or flank pain, accompanied by fever and chills.

4. Provider Linkage: The attending physician must explicitly link the organism to the condition (e.g., “Pyelonephritis secondary to E. coli”). Coders cannot assume the causal relationship solely from a lab report.

Related Terms & Differentials

• Pyelonephritis: A broader anatomical term for inflammation of the renal pelvis and kidney. Colinephritis is the etiological subset of this condition.

• Cystitis: Inflammation confined to the bladder. While E. coli often causes cystitis, the infection has not yet ascended to the kidneys.

• Glomerulonephritis: Inflammation of the kidney’s filtering units (glomeruli). This is typically an immune-mediated process (e.g., post-streptococcal) rather than a direct, acute bacterial invasion like colinephritis.

• Bacteriuria: The simple presence of bacteria in the urine, which can be asymptomatic and does not inherently imply kidney inflammation.

• Hydronephrosis: Swelling of a kidney due to a build-up of urine (often from an obstruction like a stone). While it can predispose a patient to colinephritis by causing urinary stasis, it is a structural issue, not an infectious one.

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DERIVATIONS of colinephritis

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Query functionality

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Med roots Appendix A Prefixes Appendix B Combining Forms Appendix C Suffixes Appendix D Suffix forms