K55.3Header code — not billable
Necrotizing enterocolitis
- Chapter
- 11. Diseases of the digestive system
- Category
- K55
- Effective date
- October 1, 2026
Related codes in category K55
K55Vascular disorders of intestineK55.0Acute vascular disorders of intestineK55.01Acute (reversible) ischemia of small intestineK55.011Focal (segmental) acute ischemia of small intestineYesK55.012Diffuse acute (reversible) ischemia of small intestineYesK55.019Acute ischemia of small intestine, extent unspecifiedYesK55.02Acute infarction of small intestineK55.021Focal (segmental) acute infarction of small intestineYesK55.022Diffuse acute infarction of small intestineYesK55.029Acute infarction of small intestine, extent unspecifiedYesK55.03Acute (reversible) ischemia of large intestineK55.031Focal (segmental) acute ischemia of large intestineYes
Frequently asked questions
What is ICD-10 code K55.3?
K55.3 is an ICD-10-CM diagnosis code for Necrotizing enterocolitis.
Is K55.3 a billable code?
No. K55.3 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is K55.3 in?
K55.3 falls under Chapter 11: Diseases of the digestive system.
When did K55.3 become effective?
K55.3 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to K55.3?
K55.3 belongs to category K55, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.