Current
N12 — Tubulo-interstitial nephritis, not specified as acute or chronic
Part of Chapter 14: Diseases of the genitourinary system , block Renal tubulo-interstitial diseases (N10-N16) .
Official Notes
Inclusion Terms
Interstitial nephritis NOS
Inclusion Terms
Pyelitis NOS
Inclusion Terms
Pyelonephritis NOS
Excludes1
calculous pyelonephritis ( N20.9 )
Child Codes
N12 has no child codes in the FY 2027 release -- it is used on its own.
Referenced By
Official notes on these codes cite N12.
FY 2027 effective October 1, 2026 · CDC NCHS and CMS