Properties

This code system defines the following properties for its concepts

Code	Type	Description
conversion-factor	decimal	Defines the conversion factor for a specific ingredient, when the conversion factor is the same for all dose forms and dose amounts for the ingredient. The value of this property will be the decimal representation of the conversion factor.
dose-form-conversion-factor	string	Defines the conversion factor for an ingredient when the conversion factor varies by the dose form of the medication. The value of this property will be a string of the form <dose-form-code>:<conversion-factor>[@<doses-per-day>], e.g. 970789:130, where '970789' is the RxNorm dose form code, and '130' is the decimal representation of the conversion factor. An example of a per-day conversion factor is fentanyl, 316987:7200@0.33333333, where 316987 is RxNorm dose form code, 7200 is the conversion factor, and 0.33333333 is the dosesPerDay, expressed as a decimal with a maximum of 8 digits after the decimal.
dose-range-conversion-factor	string	Defines the conversion factor for an ingredient when the conversion factor varies by the overall dose of the medication. The value of this property will be a string of the form <low-value>-<high-value>:<conversion-factor>, e.g. 1-20:4. Note that the low-value or high-value may be a wildcard '*' to indicate the range continues (e.g. '61-*:12' indicates the range is 61 or greater).

Concepts

This code system http://fhir.org/guides/cdc/opioid-mme-r4/CodeSystem/cfct-example-CDCMMEClinicalConversionFactors defines properties on the following codes:

Code	Display	conversion-factor	dose-form-conversion-factor	dose-range-conversion-factor
2670	Codeine	0.15
4337	Fentanyl		316987:7200@0.33333333
5489	Hydrocodone	1
3423	Hydromorphone	4
6813	Methadone			1-20:4, 21-40:8, 41-60:10, 61-*:12
7052	Morphine	1
7804	Oxycodone	1.5
7814	Oxymorphone	3