B1/B2 extension and H1B visa

[ns521]

I'm a physician on B1/B2 visa expires in February,but I applied for H1 and expect it in Mid January..my work starts on July,..I want to do extension for B1/B2 visa to stay legally for the period from January to July,what if it is denied ?

[immihelp]

You can extend B1/B2 visa for filing form I-539. Details at https://www.immihelp.com/usa-visas/extend.html