Ancylostomiasis and necatoriasis, unspecified

This code represents hookworm infection, a parasitic infestation of the small intestine caused by Ancylostoma duodenale or Necator americanus. The infection can lead to iron deficiency anemia due to chronic blood loss from the intestinal attachment sites of the worms.

Use this code when documentation confirms a diagnosis of hookworm infection, but the specific species of hookworm (Ancylostoma or Necator) is not identified. This is often seen when laboratory results confirm hookworm ova in stool but do not differentiate between the two main species.

• Only use this code when the specific hookworm species is truly unspecified in the medical record.
• If the documentation specifies Ancylostoma duodenale or Necator americanus, use the more specific codes within the 126 series.
• Consider sequencing this code as the primary diagnosis if the hookworm infection is the reason for the encounter and treatment.