P59.3 Neonatal jaundice from breast milk inhibitor

ICD-10-CM Code P59.3: Neonatal Jaundice from Breast Milk Inhibitor

ICD-10-CM code P59.3 designates a diagnosis of neonatal jaundice from breast milk inhibitor. This condition involves elevated unconjugated bilirubin in newborns linked to breastfeeding, distinct from suboptimal intake jaundice. Clinical sources detail its physiological mechanisms and management, while official coding references establish its specific diagnostic classification and hierarchy within neonatal jaundice categories. 4 5 1 2

Plain-language overview

Code P59.3 identifies a diagnosis of neonatal jaundice from breast milk inhibitor, a condition where a newborn develops elevated bilirubin levels associated with breastfeeding. This diagnosis is classified as a disease or syndrome. 4 5

Breast milk jaundice involves elevated unconjugated bilirubin in a newborn due to breast milk enhancing intestinal resorption of bilirubin and reducing intestinal motility during the neonatal period. 2

What this code represents

The diagnostic label for code P59.3 is neonatal jaundice from breast milk inhibitor, distinguishing it from P59.8 for other specified causes and P59.9 for unspecified neonatal jaundice. 4 6

Code P59.3 falls under the broader category of neonatal jaundice from other and unspecified causes, which includes related codes such as P59.0 for jaundice associated with preterm delivery. 6

Clinical context

Breast milk jaundice occurs most often in the second or later weeks of life and can continue for several weeks, whereas suboptimal intake jaundice occurs in the first week when breastfeeding is being established. 3

Breast milk jaundice occurs in a small percentage of infants between days two and five after birth due to increased enterohepatic circulation of bilirubin, peaks at two weeks, and resolves between three and twelve weeks. 1

Documentation considerations

Clinical documentation for breast milk jaundice notes elevated unconjugated bilirubin levels and the timing of the condition's occurrence in the second or later weeks of life to distinguish it from early suboptimal intake jaundice. 2 3

What the sources add

Clinical literature explains the physiological mechanism of breast milk jaundice as increased intestinal resorption of bilirubin, while official coding references provide the exact diagnostic terminology and hierarchical placement for the condition. 2 4

Clinical sources note that treatment is not necessary for breast milk jaundice unless total serum bilirubin exceeds American Academy of Pediatrics phototherapy guidelines, whereas coding sources establish the diagnostic classification without detailing clinical interventions. 2 4

Sources

1. Bookshelf — ncbi.nlm.nih.gov; accessed 2026-07-25.
2. Bookshelf — ncbi.nlm.nih.gov; accessed 2026-07-25.
3. Jaundice and Breastfeeding — cdc.gov; accessed 2026-07-25.
4. ICD-10 Version:2019 — icd.who.int; accessed 2026-07-25.
5. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-25.
6. ICD-10 code: Neonatal jaundice from other and unspecified causes — gesund.bund.de; accessed 2026-07-25.