N27.9
Small kidney, unspecified
BillableComplete code, valid to report
N27.9 (also written N279) is a billable ICD-10-CM diagnosis code for small kidney, unspecified. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 3 codes in category N27 (Small kidney of unknown cause). The Alphabetic Index lists it under 1 entry. Its coding notes include 9 Excludes2 entries.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (9 notes)
Inherited from N25–N29 Other disorders of kidney and ureter
- disorders of kidney and ureter with urolithiasis (N20-N23)
Inherited from Chapter 14 Diseases of the genitourinary system
- 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)
Includes
Further defines or gives examples of the content of the category.
Inherited from N27 Small kidney of unknown cause
- oligonephronia
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 1 entry