N27
Non-billableSmall kidney of unknown cause
Small kidney of unknown cause
This is a header/category code. For billing purposes, use a more specific child code from the list below.
Coding Notes
Includes
Conditions included under this code
- oligonephronia
Excludes 2
Conditions not included here, but the patient may have both
- •certain conditions originating in the perinatal periodP04-P96
- •certain infectious and parasitic diseasesA00-B99
- •complications of pregnancy, childbirth and the puerperiumO9A)O00
- •congenital malformations, deformations and chromosomal abnormalitiesQ00-Q99
- •endocrine, nutritional and metabolic diseasesE00-E88
- •injury, poisoning and certain other consequences of external causesS00-T88
- •neoplasmsC00-D49
- •symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classifiedR00-R94
- •disorders of kidney and ureter with urolithiasisN20-N23
Child Codes (3)
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(14)
UMLS
- Decreased number of nephronsC2673888
- Decreased numbers of nephronsC2673888
- OligonephroniaC2673888
- oligonephroniaC2673888
- Kidney smallC0156247
- Small kidneyC0156247
- Small kidney (finding)C0156247
- Small kidney of unknown causeC0156247
- Small kidney of unknown cause (finding)C0156247
- Small kidney, unspecifiedC0156247
- Small kidneysC0156247
- kidney smallC0156247
- kidneys smallC0156247
- small kidneyC0156247
Frequently Asked Questions
What is the ICD-10 code for small kidney of unknown cause?
The ICD-10-CM code for small kidney of unknown cause is N27. The full clinical description is "Small kidney of unknown cause". N27 is a non-billable header code. Use a more specific child code for billing purposes.
What does ICD-10 code N27 mean?
ICD-10-CM code N27 represents “Small kidney of unknown cause”. It is classified under Chapter 14: Diseases of the Genitourinary System and is a non-billable header code. Use a more specific child code for billing purposes.
Is N27 a billable code?
No, N27 is a non-billable header code. You need to use one of its more specific child codes for billing. There are 3 child codes under N27.
What chapter is N27 in?
N27 is in Chapter 14: Diseases of the Genitourinary System (codes N00-N99).
What are the subcategories under N27?
N27 has 3 child codes, including: N27.0 (Small kidney, unilateral), N27.1 (Small kidney, bilateral), N27.9 (Small kidney, unspecified).
What are the UMLS CUIs for N27?
N27 is linked to 2 UMLS Concept Unique Identifiers: C2673888, C0156247. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does N27 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like small kidney of unknown cause affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of N27?
N27 maps to the ICD-11 code: MF54.2 (Small kidney).
Automate ICD-10 Coding With AI
Send clinical text to the AutoICD API and get back structured ICD-10 codes with confidence scores. Integrates into any EHR or billing system in minutes.
Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.