Hyperbilirubinemia is the common complication that occurs in neonatal period. Therapeutic modality is needed since phototherapy as a standard procedure for hiperbilirubinemia in hospital is often give side effects. Field massage is an adjuvant therapy might increases the excretion of infant bilirubin serum in procedure of phototherapy. However, previous research used field massage noticed that decreased levels of bilirubin allegedly increased with the frequency of defecation as massage effect. The purpose of this study was to determine effect of field massage as adjuvant to level of bilirubin serum in neonatal with phototherapy.The research design used quasi experiments with non equivalent pre test-post test design. The sample was recruited by consecutive sampling of 16 respondents in intervention group and 16 respondents in control group. Data were analyzed by using Dependent T-Test, Independent T-Test, and Analysis Covarians. Results showed that the mean serum bilirubin level after intervention in intervention group showed (8.09+1.21), while the control group were about 10.05+2.17. Decreasing mean serum bilirubin level in the intervention group (7.20+1.59) and the control group (4.64+1.25), between two groups showed that there had significant decrease (p=0.001). Contribution of confounding variables did not affect to the decreased mean serum bilirubin level, whereas after controlled confounding variables in the intervention group showed had net value (7.23+0.37), and for the control group (4.61+0.37). It can be concluded that field massage is effective and useful in decreasing bilirubin serum levels. Results of this study can be used as one of alternative nursing interventions in managing neonatal hyperbilirubinemia in hospitals