The start of a gaps through period. This may be the start of the measurement period defined by a measure, or a customized desired performance period start date determined by a payer, a provider, a measure program, and etc.

The end of a gaps through period (the gaps through date). The gaps through date could be a past date or a future date. For example, today's date is 2020-06-18, 1) if periodEnd date is 2020-09-30, it returns gaps through 2020-09-30, and 2) if the periodEnd date is 2020-05-31, it returns gaps through 2020-05-31.

The category of the measures that is of interest for the care gaps report. This references the topic element in the Measure resource. Examples of topic may be screening measures, HEDIS measure domains, chronic disease measures. For example, setting topic to be a screening caregory will run care gaps on all screening measures. Topic may also be a "value set" that is defined with a list of domains/categories, etc. Topic examples: "screening", "pediatric". When multiple topics are provided, it is expected to be union of measures in those topics. Note that the type of this parameter is a string with a search type of token, so the $care-gaps operation has only simple input parameters and may be invoked using GET.

Subject will be a reference to either Patient QI Core Patient or Group DEQM Gaps In Care Group Profile. Must provide either Patient/123 or Group/123, cannot simply provide 123. If only 123 is provided, then the operation would not know if it is a Patient reference or a Group reference.

Reference to a practitioner DEQM Practitioner for which the gaps in care report will be created. For a practitioner focused gaps in care report, this is a required In Parameter. The Server needs to make sure that practitioner is authorized to get the gaps in care report for and know what measures the practitioner are eligible or qualified.

Reference to an organization DEQM Organization for which the gaps in care report will be created. For a provider organization focused gaps in care report, this is a required In Parameter.

Indicates status of a care gap. For both open and closed gaps, two seperate status parameters must be provided. For a positive proportion measure, gap means the patient is not in the numerator. For an inverse (negative) proportion measure (e.g., Diabetes: Hemoglobin A1c (HbA1c) Poor Control (> 9%)), gap means the patient is in the numerator.

The id of a Measure resource that is on the server for which the gaps in care will be reported. E.g., the id of the Measure resource for Breast Cancer Screening measure.

The business identifier of a measure for which the gaps in care will be reported. E.g., CMS125 is a CMS assigned identifier for the Breast Cancer Screening eCQM in their system. Note that the type of this parameter is a string with a search type of token, so the $care-gaps operation has only simple input parameters and may be invoked using GET.

This the the URL of a measure for which the gaps in care will be reported. A measure URL is specified in the url element of the Measure resource. The measure URL remains the same when the measure is stored on different servers.

The programs that a provider (either practitioner or provider organization) participates in, e.g., risk based, value based, or other performance program such as CMS Merit-based Incentive Payment Program (MIPS), Hospital Quality Reporting (HQR) programs. Program is represented in the Measure using element useContext. When the code attribute of useContext is program, then the value attribute of useContext represents a specific program. Note that the type of this parameter is a string with a search type of token, so the $care-gaps operation has only simple input parameters and may be invoked using GET.

The $care-gaps operation returns Parameters resource, containing zero or more document bundles that conform to the DEQM Gaps In Care Bundle Profile. Note that the result of the $care-gaps operation must be returned using the Parameters resource, even when the result contains only one bundle, because the cardinality of the return parameter is specified as 0..*.