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Coding

Medtronic Coding and Units

This is a DRAFT FHIR Implementation Guide. This version is not final yet. DO NOT USE, except for trial and test.

All measurements from Medtronic devices are coded with Medtronic codes, which may or may not be exchanged.

Where possible, a code from an accepted international code system is used. These are:

• LOINC for measurements on patient data. LOINC is not commonly used for device-oriented measurements (such a on/off, alarms etc.)
• IEEE 11073 codes were appropriate.
• Snomed CT codes when the above do not apply, or when a jurisdictions prefers Snomed CT codes.

UCUM

The Unified Code for Units of Measure is a system for exchange of units in a standardized, non-ambiguous way.

See also:

• Unified Code for Units of Measure
• Using UCUM with FHIR

Example UCUM codes

Unit term	UCUM name
g/L	gram per liter
10*9/uL	billion per microliter
Cel	degree Celsius
[iU]/d	international unit per day
mmol/L	millimole per liter

LOINC

LOINC is a publicly available standard at no cost (only a registration is required). LOINC is the de facto standard in the laboratory and clinical measurements domain.

See also:

• LOINC
• Using LOINC with FHIR

Example LOINC codes

Code	LOINC Long common name
14749-6	Glucose [Moles/volume] in Serum or Plasma
15074-8	Glucose [Moles/volume] in Blood
97507-8	Average glucose [Mass/volume] in Interstitial fluid during Reporting Period
32016-8	Glucose [Mass/volume] in Capillary blood
41939-0	Current medication, Bolus delivered

ISO/IEEE 11073

ISO/IEEE 11073 is a family of standards in Personal health device communication. The framework provides a general approach as well as specialized sections for glucose monitors, insulin pumps et cetera. Medtronic uses the MDC codes are 32-bit unsigned decimal integers versions of the code, also known as the CF_CODE10.

See also:

• ISO/IEEE 11073 Health informatics — Personal health device communication
• Using MDC Codes with FHIR

Example IEEE 11073 codes

Code	Reference Identifier
160196	MDC_CONC_GLU_VENOUS_PLASMA
160368	MDC_CONC_GLU_UNDETERMINED_PLASMA
160020	MDC_CONC_GLU_GEN
160364	MDC_CONC_GLU_UNDETERMINED_WHOLEBLOOD

Medtronic codes

The Medtronic codes are used for internal consistency, as well as encoding of concepts and data items specific to Medtronic devices, where no matching standardized code might be availble.

Attribute	Definition	Example
Code	6-digit unique code	200001
Display	Shorter name for the code	Average SG
Definition	Longer description	The average of glucose readings…