Diseases of the genitourinary system (N00-N99)

Excludes 2:
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)

Renal tubulo-interstitial diseases (N10-N16)

Includes:
pyelonephritis
Excludes 1:
pyeloureteritis cystica (N28.85)
N10 Acute pyelonephritis
Acute infectious interstitial nephritis
Acute pyelitis
Acute tubulo-interstitial nephritis
Hemoglobin nephrosis
Myoglobin nephrosis
Use additional code (B95-B97), to identify infectious agent.
N11 Chronic tubulo-interstitial nephritis [+]
Includes: chronic infectious interstitial nephritis
chronic pyelitis
chronic pyelonephritis
Use additional code (B95-B97), to identify infectious agent.
N12 Tubulo-interstitial nephritis, not specified as acute or chronic
Interstitial nephritis NOS
Pyelitis NOS
Pyelonephritis NOS
Excludes 1: calculous pyelonephritis (N20.9)
N13 Obstructive and reflux uropathy [+]
Excludes 2: calculus of kidney and ureter without hydronephrosis (N20.-)
congenital obstructive defects of renal pelvis and ureter (Q62.0-Q62.3)
hydronephrosis with ureteropelvic junction obstruction (Q62.11)
obstructive pyelonephritis (N11.1)
N14 Drug- and heavy-metal-induced tubulo-interstitial and tubular conditions [+]
Code first poisoning due to drug or toxin, if applicable (T36-T65 with fifth or sixth character 1-4)
Use additional code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
N15 Other renal tubulo-interstitial diseases [+]
N16 Renal tubulo-interstitial disorders in diseases classified elsewhere
Pyelonephritis
Tubulo-interstitial nephritis
Code first underlying disease, such as:
brucellosis (A23.0-A23.9)
cryoglobulinemia (D89.1)
glycogen storage disease (E74.0-)
leukemia (C91-C95)
lymphoma (C81.0-C85.9, C96.0-C96.9)
multiple myeloma (C90.0-)
sepsis (A40.0-A41.9)
Wilson's disease (E83.01)
Excludes 1: diphtheritic pyelonephritis and tubulo-interstitial nephritis (A36.84)
pyelonephritis and tubulo-interstitial nephritis in candidiasis (B37.49)
pyelonephritis and tubulo-interstitial nephritis in cystinosis (E72.04)
pyelonephritis and tubulo-interstitial nephritis in salmonella infection (A02.25)
pyelonephritis and tubulo-interstitial nephritis in sarcoidosis (D86.84)
pyelonephritis and tubulo-interstitial nephritis in Sjogren syndrome (M35.04)
pyelonephritis and tubulo-interstitial nephritis in systemic lupus erythematosus (M32.15)
pyelonephritis and tubulo-interstitial nephritis in toxoplasmosis (B58.83)
renal tubular degeneration in diabetes (E08-E13 with .29)
syphilitic pyelonephritis and tubulo-interstitial nephritis (A52.75)

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