N11.0 Nonobstructive reflux-associated chronic pyelonephritis

Billable ICD-10-CM code, FY2026.

Applicable to

• Pyelonephritis (chronic) associated with (vesicoureteral) reflux

Excludes1 (never code together)

• vesicoureteral reflux NOS (N13.70)

Applies from N11 Chronic tubulo-interstitial nephritis

Includes

• chronic infectious interstitial nephritis
• chronic pyelitis
• chronic pyelonephritis

Use additional code

• code (B95-B97), to identify infectious agent.

MS-DRG index

Defines the logic of DRG(s) 689-690 in MDC 11.

Approximate ICD-9-CM (GEMs)

• 590.00 Chronic pyelonephritis without lesion of renal medullary necrosis (approximate)
• 590.01 Chronic pyelonephritis with lesion of renal medullary necrosis (approximate)

Code annotations containing back-references to N11.0

Back-references to N11.0

• Type 1 Excludes: N13.7 Vesicoureteral-reflux ("reflux-associated pyelonephritis (N11.0)")

Back-references to N11

• Type 1 Excludes: N03 Chronic nephritic syndrome ("chronic tubulo-interstitial nephritis (N11.-)")

Diagnosis Index entries for N11.0

• Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic) › tubulo-interstitial (in) › chronic (infectious) › nonobstructive › reflux-associated
• Pyelonephritis › chronic › nonobstructive › with reflux (vesicoureteral)
• Pyelonephritis › nonobstructive › with reflux (vesicoureteral)
• Reflux › vesicoureteral (with scarring) › with › pyelonephritis (chronic)

Nearby codes

• N11 Chronic tubulo-interstitial nephritis
• N11.0 Nonobstructive reflux-associated chronic pyelonephritis (this code)
• N11.1 Chronic obstructive pyelonephritis
• N11.8 Other chronic tubulo-interstitial nephritis
• N11.9 Chronic tubulo-interstitial nephritis, unspecified