Small kidney of unknown cause
In Other disorders of kidney and ureter (N25-N29), chapter 14: Diseases of the Genitourinary System
3 billable codes under N27: none are a CC or MCC; none map to an HCC.
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Instructional notes
Includes: conditions that are coded here
- oligonephronia
Also applies, from Other disorders of kidney and ureter (N25-N29)
These notes sit on N25-N29 and apply to every code under it, including N27.
Excludes2: not included here, code separately if applicable
- disorders of kidney and ureter with urolithiasis (N20-N23)
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers chronic kidney disease staging, CKD in kidney transplant patients, and sequencing CKD with related conditions such as diabetes and hypertension.
- Chronic kidney disease (page 62)
All codes under N27
N27 can't be used on a claim. Pick a billable code below; grey headings group them.
N27 MS-DRGs
As the principal diagnosis, all 3 billable codes under N27 group to MS-DRG 698, 699, or 700 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
Other codes that refer to N27
Notes on these codes point to N27.
- N26 Excludes1: small kidney of unknown cause (N27.-)
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Kidney Diseases
You have two kidneys, each about the size of your fist. They are near the middle of your back, just below the rib cage. Inside each kidney there are about a million tiny structures called nephrons. They filter your blood. They remove wastes and extra water, which become urine. The urine flows through tubes called ureters. It goes to your bladder, which stores the urine until you go to the bathroom.
Read more about kidney diseases on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.