> ## Documentation Index
> Fetch the complete documentation index at: https://docs.rhizomeai.com/llms.txt
> Use this file to discover all available pages before exploring further.

# US Code of Federal Regulations (CFR)

> Search filters and result fields of us_cfr.

* **Dataset id:** `us_cfr`
* **Jurisdiction:** US · FDA
* **Date field:** `amendment_date`. The search's top-level `date_from` and `date_to` filter on it.
* **Access:** any API key.

## Filters

Send these under `filters.us_cfr` in a [search](https://docs.rhizomeai.com/api-reference/v3/search.md) request. A filter not listed here, or a value of the wrong type, is a 400. The top-level `date_from` and `date_to` set `amendment_date_from` and `amendment_date_to` below, so give a date in one place only.

**cfr\_title** `string`

CFR title number. Covered: 9 (Animals and Animal Products), 10 (Energy), 21 (Food and Drugs), 37 (Patents, Trademarks, and Copyrights), 40 (Protection of Environment), 42 (Public Health), 45 (Public Welfare). Values: `9`, `10`, `21`, `37`, `40`, `42`, `45`.

**part** `string`

Exact CFR part number, e.g. '211' (21 CFR cGMP), '164' (45 CFR HIPAA), '493' (42 CFR CLIA). Pair with `cfr_title`.

**section** `string`

Exact section number, e.g. '211.100' or '164.512' (a paragraph designator such as '(b)(1)' is dropped), or an appendix label, e.g. 'Appendix B to Part 50'. Pair with `cfr_title`.

**full\_citation** `string`

Exact citation, e.g. '21 CFR 211.100', '45 CFR 46.116' or 'Appendix B to 10 CFR Part 50' ('10 CFR Part 50, Appendix B' also works). A paragraph designator is dropped ('21 CFR 312.32(c)' finds 21 CFR 312.32); a part citation ('42 CFR Part 493') matches the whole part.

**section\_title** `string`

Words that must all appear in the section heading (any order), e.g. 'personnel qualifications'.

**part\_title** `string`

Words that must all appear in the part heading (any order), e.g. 'Current Good Manufacturing Practice' or 'Protection of Human Subjects'.

**chapter** `string`

Phrase in the chapter heading, which names the issuing agency, e.g. 'Food and Drug Administration', 'Centers for Medicare', 'Nuclear Regulatory Commission'.

**subpart** `string`

Subpart of a part, by letter ('WWWWW', 'C') or heading words ('Subpart C', 'Design Controls'). Pair with `cfr_title` and part, e.g. 40 CFR Part 63 subpart WWWWW (hospital ethylene oxide sterilizers).

**node\_type** `string`

'section' for a numbered section, 'appendix' for an appendix to a part or subpart. Values: `section`, `appendix`.

**amendment\_date\_from** `string (date)`

Inclusive lower bound on `amendment_date` (YYYY-MM-DD): the effective date of the section's latest amendment when eCFR records one since 2017, else the Federal Register publication date of the latest rule in its source note. Example: '2024-01-01'.

**amendment\_date\_to** `string (date)`

Inclusive upper bound on `amendment_date` (YYYY-MM-DD); same date as `amendment_date_from`. Example: '2024-12-31'.

## Fields

Each result from this dataset has these in `fields`:

`amendment_date`, `cfr_title`, `cfr_title_name`, `chapter`, `full_citation`, `node_type`, `part`, `part_title`, `section`, `section_title`, `subchapter`, `subpart`, `url`


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