FHIR Resources to represent Supply Chain

[roywanyaga]

We will be tracking inventory change events using the FHIR Observation resource

On a high level these Observations denote the following aspects of the inventory change events:

• The type of the stock commodity affected by the event. Denoted by a reference to the Group Resource representing the stock commodity type.

• The category of stock inventory event. The possible categories include:

  1. Status listing (provision of the current quantity such as during physical count or stock adjustments). Represented by codeableConcept coding:
     "category": [ { "coding": [ { "system": "http://snomed.info/sct", "code": "386452003", "display": "Supply management" } ] }, { "coding": [ { "system": "http://hl7.org/fhir/inventoryreport-counttype", "code": "snapshot", "display": "Snapshot" } ], "text": "Snapshot" } ]
  2. Reception (during stock supply or addition through other means). Represented by codeableConcept coding:
     "category": [ { "coding": [ { "system": "http://snomed.info/sct", "code": "386452003", "display": "Supply management" } ] }, { "coding": [ { "system": "http://hl7.org/fhir/inventoryreport-counttype", "code": "addition", "display": "Addition" } ], "text": "Addition" } ]
  3. Depletion (Through consumption, issuance to patents, use during service delivery, damage, expiry, or other means). Represented by codeableConcept coding:
     "category": [ { "coding": [ { "system": "http://snomed.info/sct", "code": "386452003", "display": "Supply management" } ] }, { "coding": [ { "system": "http://hl7.org/fhir/inventoryreport-counttype", "code": "subtraction", "display": "Subtraction" } ], "text": "Subtraction" } ]

• The number of stock items added, subtracted, or are present

• The type of the stock-related event (such as physical count, stock supply, patient visit, donation, expiry, damage, etc.). These are detailed in the table below.

• The date and time of the event

• The updated stock count for the commodity type as a result of the event

For each of the commodity types, multiple Observations will be created depending on the type of stock inventory events.

The different possible stock inventory events, their codes, categories, questionnaire fields, and condition for relevance are provided below:

During the supervisor visit (physical count and restock)

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Type	Code	Category
System Balance before restocking	balance-before-restock	snapshot
Stock on Hand after Physical Inventory Count	physical-count-soh	snapshot
Adjustment due to over-reporting	over-reporting	subtraction
Adjustment due to under-reporting	under-reporting	addition
Adjustment due to expiry	expiry	subtraction
Adjustment due to damage	damage	subtraction
Adjustment due to donation	donation	addition
Stock supply/resupply	restocked	addition
Balance after adjustment and restocking	balance-after-restock	snapshot

During the patient visits and service delivery

---

Type	Code	Category
Stock use/depletion during patient visit	consumption	subtraction

[pld]

Can you add more info on how the over/under reporting works?