N27
Header — not billableSmall kidney of unknown cause
The ICD-10 code for small kidney of unknown cause is N27.
N27 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 3 more specific codes below.
Clinical notes
Includes
Terms listed here further define or give examples of the conditions grouped under this code — they describe what the code covers, not a separate diagnosis.
- oligonephronia
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- N25Disorders resulting from impaired renal tubular functionnon-billable header
- N26Unspecified contracted kidneynon-billable header
- N28Other disorders of kidney and ureter, not elsewhere classifiednon-billable header
- N29Other disorders of kidney and ureter in diseases classified elsewhere
- N27Small kidney of unknown causenon-billable header