N27 — Small kidney of unknown cause
Is N27 billable?
No — N27 is a non-billable header code. N27 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 3 billable codes beneath N27.
Billable codes under this header
N27 at a glance
| Code | N27 |
|---|---|
| Description | Small kidney of unknown cause |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Includes
Conditions classified to N27.
- oligonephronia
Excludes2 — not included here — inherited from Chapter 14
The conditions below are not part of N27, but a patient may have both at the same time. When documentation supports it, N27 and the excluded code may both be reported.
- 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)
Excludes2 — not included here — inherited from N25-N29
The conditions below are not part of N27, but a patient may have both at the same time. When documentation supports it, N27 and the excluded code may both be reported.
- disorders of kidney and ureter with urolithiasis (N20-N23)
What codes fall under N27? (3)
How long has N27 existed?
N27 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.