N27Non-billableSave
N27 - Small kidney of unknown cause
ICD-10-CM Chapter 14: Diseases of the genitourinary system · N25-N29 Other disorders of kidney and ureter (N25-N29) · Top-level category · FY2027
Coding Guidance
N27 is a non-billable heading. Report one of the 3 more specific codes below.
Includes, Excludes and Coding Notes
IncludesFrom N27
Conditions this code covers.
- oligonephronia
Excludes 2 — Not Included HereFrom N25-N29 Other disorders of kidney and ureter (N25-N29)
Not part of this code; report both codes when the patient has both conditions.
- disorders of kidney and ureter with urolithiasis (N20-N23)
Excludes 2 — Not Included HereFrom Chapter N00-N99
Not part of this code; report both codes when the patient has both conditions.
- 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)
Chapter Information
Related ICD-10 Codes
More specific codes for N27
Other categories in this chapter
Codes at the same level as N27
- Acute nephritic syndromeN00
- Rapidly progressive nephritic syndromeN01
- Recurrent and persistent hematuriaN02
- Chronic nephritic syndromeN03
- Nephrotic syndromeN04
- Unspecified nephritic syndromeN05
- Isolated proteinuria with specified morphological lesionN06
- Hereditary nephropathy, not elsewhere classifiedN07
- Glomerular disorders in diseases classified elsewhereN08
- Acute pyelonephritisN10
- Chronic tubulo-interstitial nephritisN11
- Tubulo-interstitial nephritis, not specified as acute or chronicN12
- Obstructive and reflux uropathyN13
- Drug- and heavy-metal-induced tubulo-interstitial and tubular conditionsN14
- Other renal tubulo-interstitial diseasesN15
- Renal tubulo-interstitial disorders in diseases classified elsewhereN16
- Acute kidney failureN17
- Chronic kidney disease (CKD)N18
- Unspecified kidney failureN19
- Calculus of kidney and ureterN20
- Calculus of lower urinary tractN21
- Calculus of urinary tract in diseases classified elsewhereN22
- Unspecified renal colicN23
- Disorders resulting from impaired renal tubular functionN25
- Unspecified contracted kidneyN26
- Other disorders of kidney and ureter, not elsewhere classifiedN28
- Other disorders of kidney and ureter in diseases classified elsewhereN29
- CystitisN30
- Neuromuscular dysfunction of bladder, not elsewhere classifiedN31
- Other disorders of bladderN32
- Bladder disorders in diseases classified elsewhereN33
- Urethritis and urethral syndromeN34
- Urethral strictureN35
- Other disorders of urethraN36
- Urethral disorders in diseases classified elsewhereN37
- Other disorders of urinary systemN39
- Benign prostatic hyperplasiaN40
- Inflammatory diseases of prostateN41
- Other and unspecified disorders of prostateN42
- Hydrocele and spermatoceleN43
44 more in this chapter.