K55.31

Stage 1 necrotizing enterocolitis

Risk-adjusting (HCC)Billable code

HCC risk adjustment mapping

CMS-HCC ESRD V24

HCC107

Vascular Disease with Complications

Coding notes

Excludes 1 never coded together · Excludes 2 may co-exist

This code · K55.31

Synonyms

Necrotizing enterocolitis without pneumatosis, without perforation

Inherited from K55.3Necrotizing enterocolitis

Excludes 1

necrotizing enterocolitis of newborn (P77.-)

Excludes 2

necrotizing enterocolitis due to Clostridium difficile (A04.7-)

Inherited from K55Vascular disorders of intestine

Excludes 1

necrotizing enterocolitis of newborn (P77.-)

Excludes 2

angioectasia (angiodysplasia) duodenum (K31.81-)

Inherited from chapter 11Diseases of the digestive system

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)

Official Guidelines for K55.31

FY 2026 ›

I.C.11Chapter-specific guidanceChapter 11: Diseases of the Digestive System (K00-K95)

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