This paper reports a preliminary spectroscopic characterization of the surface elemental and phase compositions of Ti49Ni51 alloy treated using various sterilization procedures (autoclaving in water, steam, sealed envelopes; boiling in water and chemical etching). The surface of TiNi is found to consist of a thin oxide covered by a carbon-dominated contamination layer. The surface oxide of autoclaved samples is (TiO2)xNiy where y varies in the range 0-6 at.% depending on the surface preparation procedure. Minor amounts of suboxides as well as metallic Ni are also detected. Preliminary estimations of the oxide film thickness showed that it varies in the range 7- 26 nm depending on the employed method of sterilization. Mechanisms of surface state formation are briefly discussed.