A permanent resident (called lawful permanent resident or LPR) or conditional resident (CR) who has remained outside the United States for longer than one year, or beyond the validity period of a Re-entry Permit, will require a new immigrant visa to enter the United States and resume permanent residence. A provision exists under U.S. visa law for the issuance of a returning resident special immigrant visa to an LPR who remained outside the United States due to circumstances beyond his/her control. This webpage is about Returning Resident Visas. If you are an LPR unable to return to the United States within the travel validity period of the green card (1 year) or the validity of the Re-entry Permit (2 years), you may be eligible and can apply at the nearest U.S. Embassy or Consulate for a Returning Resident (SB-1) immigrant visa.
If your application for returning resident status is approved, this eliminates the requirement that an immigrant visa petition be filed on your behalf with the Department of Homeland Security (DHS), U.S. Citizenship and Immigration Services (USCIS). You will need to be interviewed for both your application for returning resident status, and usually later for the immigrant visa. An SB-1 applicant is required to establish eligibility for an immigrant visa and have a medical examination. Therefore, this involves paying both visa processing fees and medical fees.
For more information visit https://travel.state.gov/content/visas/en/immigrate/returning-residents.html