library HIVScreeningFHIR version '0.0.001'

using QICore version '4.1.1'

/*This spec aligns with AU2023/PY2024 QDM version*/

include FHIRHelpers version '4.2.000' called FHIRHelpers
include SupplementalDataElements version '3.2.000' called SDE
include CQMCommon version '1.1.000' called CQMCommon
include FHIRCommon version '4.2.000' called FHIRCommon
include QICoreCommon version '1.3.000' called QICoreCommon

codesystem "LOINC": 'http://loinc.org' 
codesystem "ActCode": 'http://terminology.hl7.org/CodeSystem/v3-ActCode'
codesystem "ConditionClinicalStatusCodes": 'http://terminology.hl7.org/CodeSystem/condition-clinical'

valueset "HIV": 'http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.3.464.1003.120.12.1003' 
valueset "Human Immunodeficiency Virus (HIV) Laboratory Test Codes (Ab and Ag)": 'http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113762.1.4.1056.50' 
valueset "Office Visit": 'http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.3.464.1003.101.12.1001' 
valueset "Preventive Care Services - Established Office Visit, 18 and Up": 'http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.3.464.1003.101.12.1025' 
valueset "Preventive Care Services, Initial Office Visit, 0 to 17": 'http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.3.464.1003.101.12.1022' 
valueset "Preventive Care Services-Initial Office Visit, 18 and Up": 'http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.3.464.1003.101.12.1023' 
valueset "Preventive Care, Established Office Visit, 0 to 17": 'http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.3.464.1003.101.12.1024' 

code "Birth date": '21112-8' from "LOINC" display 'Birth date'
code "HIV 1 and 2 tests - Meaningful Use set": '75622-1' from "LOINC" display 'HIV 1 and 2 tests - Meaningful Use set'
code "AMB" : 'AMB' from "ActCode" display 'Ambulatory'
code "active": 'active' from "ConditionClinicalStatusCodes"

parameter "Measurement Period" Interval<DateTime>

context Patient

define "Initial Population":
AgeInYearsAt(date from start of "Measurement Period")in Interval[15, 65]
and exists "Qualifying Encounters"

define "Denominator":
  "Initial Population"

define "Numerator":
  ( "Has HIV Test Performed" )

define "Denominator Exclusions":
exists ( ["Condition": "HIV"] HIV
    where QICoreCommon."ToPrevalenceInterval" ( HIV Indicators ) starts before start of "Measurement Period" 
    and HIV.clinicalStatus~"active"
  )

define "Qualifying Encounters":
( ["Encounter": "Preventive Care Services, Initial Office Visit, 0 to 17"]
    union ["Encounter": "Preventive Care Services-Initial Office Visit, 18 and Up"]
    union ["Encounter": "Preventive Care, Established Office Visit, 0 to 17"]
    union ["Encounter": "Preventive Care Services - Established Office Visit, 18 and Up"]
    union ["Encounter": "Office Visit"] ) Encounter
    where Encounter.period during "Measurement Period"
        and Encounter.class ~ "AMB"
        and Encounter.status = 'finished'

define "Has HIV Test Performed":
exists ( ["Observation": "Human Immunodeficiency Virus (HIV) Laboratory Test Codes (Ab and Ag)"]
    union ["Observation": "HIV 1 and 2 tests - Meaningful Use set"] ) HIVTest
    where AgeInYearsAt(date from start of QICoreCommon."ToInterval"(HIVTest.effective))in Interval[15, 65]
      and QICoreCommon."ToInterval" ( HIVTest.effective ) starts before 
      end of "Measurement Period"
      and (HIVTest.status = 'final' or HIVTest.status = 'amended' or HIVTest.status = 'corrected')
      
define "SDE Ethnicity":
SDE."SDE Ethnicity"

define "SDE Payer":
SDE."SDE Payer"

define "SDE Race":
SDE."SDE Race"

define "SDE Sex":
SDE."SDE Sex"