Activity Codes

NIH uses three-character activity codes to differentiate the wide variety of research-related programs NIH supports. The first character typically identifies the major funding category or program type. For example, activity codes for research and development often start with "R," training with "T," fellowship with "F," and career development with "K." Each institute and center (IC) participates in a subset of activity codes. Although each activity code has a broadly defined purpose, there may be differences in their use from one IC to another. Applicants should always refer to the funding opportunity for the specific requirements and details of an initiative.

Activity Code ▼ Funding Category Title Description
FM1 Research Training and Career Development Fellowship for Intramural Dual-Degree Scientists (FIDDS) To provide predoctoral individuals with training which leads to the combined degrees (e.g., MD/PhD) for trainees completing PhD dissertation research in NIH intramural labs.

This page last updated on: February 8, 2025
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