2020 ICD-10-CM Diagnosis Code N27

Small kidney of unknown cause

    2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
  • N27 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2020 edition of ICD-10-CM N27 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of N27 - other international versions of ICD-10 N27 may differ.
Includes
Includes Help
"Includes" further defines, or give examples of, the content of the code or category.
  • oligonephronia
The following code(s) above N27 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to N27:
  • N00-N99
    2020 ICD-10-CM Range N00-N99

    Diseases of the genitourinary system

    Type 2 Excludes
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • complications of pregnancy, childbirth and the puerperium (O00-O9A)
    • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
    • endocrine, nutritional and metabolic diseases (E00-E88)
    • injury, poisoning and certain other consequences of external causes (S00-T88)
    • neoplasms (C00-D49)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    Diseases of the genitourinary system
  • N25-N29
    2020 ICD-10-CM Range N25-N29

    Other disorders of kidney and ureter

    Type 2 Excludes
    • disorders of kidney and ureter with urolithiasis (N20-N23)
    Other disorders of kidney and ureter
Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
Code annotations containing back-references to N27:
  • Type 1 Excludes: N26
    ICD-10-CM Diagnosis Code N26

    Unspecified contracted kidney

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • contracted kidney due to hypertension (I12.-)
    • diffuse sclerosing glomerulonephritis (N05.8.-)
    • hypertensive nephrosclerosis (arteriolar) (arteriosclerotic) (I12.-)
    • small kidney of unknown cause (N27.-)
ICD-10-CM Codes Adjacent To N27
N25.0 Renal osteodystrophy
N25.1 Nephrogenic diabetes insipidus
N25.8 Other disorders resulting from impaired renal tubular function
N25.81 Secondary hyperparathyroidism of renal origin
N25.89 Other disorders resulting from impaired renal tubular function
N25.9 Disorder resulting from impaired renal tubular function, unspecified
N26 Unspecified contracted kidney
N26.1 Atrophy of kidney (terminal)
N26.2 Page kidney
N26.9 Renal sclerosis, unspecified
N27 Small kidney of unknown cause
N27.0 Small kidney, unilateral
N27.1 Small kidney, bilateral
N27.9 Small kidney, unspecified
N28 Other disorders of kidney and ureter, not elsewhere classified
N28.0 Ischemia and infarction of kidney
N28.1 Cyst of kidney, acquired
N28.8 Other specified disorders of kidney and ureter
N28.81 Hypertrophy of kidney
N28.82 Megaloureter
N28.83 Nephroptosis

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.