Commonly Used NIH Grant Mechanisms
(aka ACTIVITY CODES) 

R01 Research Project

R03 Small Research Grant

R21 Exploratory/Developmental Grant

R37 Method to Extend Research in Time (MERIT) Award

R55 Shannon Award

P01 Research Program Project

P30 Center Core Grants

P50 Specialized Center

P60 Comprehensive Center

F32 Postdoctoral Individual National Service Award

T32 Institutional National Service Award

K01 Mentored Research Scientist Development Award

K02 Independent Scientist Award

K07 Academic Career Award

K08 Mentored Clinical Scientist Development Award

K12 Mentored Clinical Scientist Development Program Award (Institutional)

K22 Career Transition Award (Intramural + Extramural)

K23 Mentored Patient-Oriented Research Career Development Award

K24 Midcareer Investigator Award In Patient-Oriented Research

K25 Mentored Quantitative Research Career Development Award

K30 Clinical Research Curriculum Development (Institutional)